CBSE Class 6 Science Living Organisms And Their Surroundings Worksheet Set A

Learning Objectives
1. Our environment is made up of biotic and abiotic components.
2. Main types of habitat are aquatic and terrestrial.
3. Desert plants and animals are adapted to reduce loss of water.

Livings organisms exist in most places. We come across plants and animals everyday.
Living things are found practically everywhere. Some live on land, some under water, some in burrows, and some in air. Life exists even in open volcanoes.
Some organisms live even in our homes.

HABITAT
The term habitat refers to the surroundings where organisms live. Every habitat is home for a certain living creature. Habitat includes both living and nonliving components. Plants and animals have different features that help them to survive in their own habitat. Habitat can be terrestrial or aquatic.
Do You Know : The word ecology is derived from Greek word 'Oikos' which means 'house' or 'place to live in'. German Biologist Ernst Haeckel was first one to use this word.

Importance of habitats
A good habitat provides its inhabitants the following:

1. A suitable place for organisms to stay and rest.
2. It makes enough food available.
3. Provides protection to the inhabitants.
4. Provides place for breeding and rearing of organisms.
5. Provides space for movement.
Terrestrial habitat refers to the land where all plants and animals survive. It includes deserts, forests and grasslands, as well as coastal and mountain regions. For example, camels and cactus plants live in deserts only.
Aquatic habitat refers to the water where plants and animals survive. Aquatic habitat includes rivers, ponds, lakes, ocean and swamps. For example, fish live in water.

Adaptation: Plants and animals develop certain features or certain habits that help them survive in their surroundings, and this is known as adaption. Different living creatures adapt to their habitats in different ways. For example, fish have gills that help them to live in water and use the oxygen dissolve in it.
Plants that live in water have special tissues that help to take in dissolved gas from water. For example, the ulva has ribbon-like leaves. It takes thousands of years for a livings being to adapt to its habitat.

Acclimatisation: The small adjustments by the body to overcome small changes in the surrounding atmosphere for a short period of time are called acclimatisation.
The components in a habitat are broadly classified into two types. They are biotic and abiotic components.
Biotic components include all the livings organisms in a habitat. These can be further classified into following categories:
(a) Producers (b) Consumers (c) Scavengers (d) Decomposers
(a) Producers : Green plants are the only living organisms that make their own food. They are, therefore, called producers of food.
(b) Consumers : All animals and non-green plants directly or indirectly depend on plants for food. They consume the food prepared by the producers. All animals , including human beings are consumers.

Consumers are of three types :
(i) Herbivorous animals : These are plant-eaters. Since they feed on plants directly, they are called primary consumers. Examples are cow, deer, goat, buffaloes, elephants, etc.
(ii) Carnivorous animals : These feed on other animals and are called secondary consumers. Examples are tiger, lion, wolf, etc.
(iii) Omnivorous animals : Animals that feed on both plants and animals are called omnivorous animals. Examples are humans, dogs, bears, crows, etc.
(c) Scavengers : Living organisms that feed on dead animals are called scavengers. Examples are flies, crows, dogs, vultures and hyaena.
(d) Decomposers : Microorganisms like bacteria and fungi are very small organisms. They cannot be seen with the naked eyes. These microorganisms feed on dead remains of plants and animals and their wastes. They decompose them into simple nutrient substances they were made up of. They help in recycling of matter in the environment.

Abiotic components include all the non-living things in a habitat. These include air, rocks, water, sunlight and heat. All livings things depend on the abiotic components for all their needs. The abiotic components are very useful for the survival of the biotic components in a habitat.
For example, sprouting is the first step where a new plant grows from a seed.
The sprouting of a seed depends on abiotic components such as air, water, light and heat.
The population of some species of turtles has declined due to the change in the earth's temperature. Some popular theories believe that dinosaurs became extinct because of the changes in the earth's temperature millions of years ago.

Types of habitat
Terrestrial Habitat : Habitat is the place that is natural for the life and growth of an organism.
Now let us discuss how animals and plants adapt themselves for the terrestrial and aquatic habitats.
Terrestrial habitat: All the deserts, mountains and forests and plain lands come under terrestrial habitat.

Conditions prevailing in terrestrial habitat:
• Oxygen is available in plenty.
• Temperature varies from season to season and from place to place.
• Light is available in sufficient quantity.
• Water is variable and animals have to adapt to less water.

Adaptations in desert animals : Camels have long legs for adaptation. It has hump to store fat, can drink large quantities of water at one time and can stay without water for several days. It excretes very little urine and its dung is dry.
It does not sweat and its feet are padded so that it can walk on sand easily.

Snakes and rats live in burrows and come out only during the night when it is cool.

Adaptations in desert plants : Xerophytes or desert plants shows some adaptations to sustain in the desert conditions.
In desert plants, the leaves are either absent or reduced to spines as in cacti.
The leaf-like structure seen in cactus is its stem and it carries photosynthesis.
The roots grow deep into the soil for absorbing water. The reduced leaf and the thick waxy layer of stem minimise transpiration. Many Cacti plants have fleshy stems to store water. These are called succulents.

Adaptations in plants and animals found in cold regions : The plants and animals in the mountain habitat show some adaptations.
Most of the trees in cold mountains are cone shaped. The leaves are also very thin and look like needles for the sliding of water and snow during rains and snowfall. Animals in mountain areas have long hair and thick skin to protect them from cold climate. Thick fur all over Bodies of Yak and Snow Leopard protects them from the cold climate. The mountain goat, have strong hooves that help them run on the mountain slopes easily.

Adaptations in animals found in grassland : The animals living in the grasslands show some adaptations.
Lions live in forests and prey on other animals, like deer, for food.

The lions brown skin colour blends easily with the colour of dry grass in grasslands and helps in the catching the prey. They have strong claws to tear and eat their food. The eyes of the lion in front of its head help in identifying the prey from long distances. Deers have long ears to help them sense the presence of a predator. Deers have eyes on the side of its head to look in all directions for danger and have long legs to run away from predator.

Aquatic Habitat
All the fresh water and marine water bodies , has come under aquatic habitat

Conditions prevailing in terrestrial habitat:
• Except in deep oceans, uniform supply of light, temperatures, oxygen is available.
• Light and temperature vary in deep oceans at different depths.

Adaptations in aquatic animals
Fish have special features that help them to live in water.
They have streamlined bodies, which reduce friction and allow them to move freely in water.
Sea animals like the octopus and the squid do not have streamlined body as they stay deep inside the ocean on the ocean bed, but make their body streamlined when they move in the water.
Sea animals, like fish, octopus and squid have gills that help them to absorb the dissolved oxygen from the water they drink!
Dolphins and whales have blowholes to breathe in air when they swim close to the surface of the water and there by stay inside the water for a long time without breathing.

Adaptations in aquatic plants
In general the aquatic plants have much smaller roots and helps the plant in holding on the surface. Stems are long and light. Leaves and Submerged plants
such as Ulva has narrow and ribbon-like leaves. These allow the plants to bend themselves in the direction of the flow of water.In milfoil, leaves are highly dissected, making water to easily flow without Frogs usually live in ponds and lakes.

Amphibians
A frog can live both in water and on land. Frogs have strong hind legs to hop on land and webbed feet to swim in water.
Frogs also have a membrane called the nictitating membrane on their eyes.
This membrane helps protect their eyes inside water.

Aerial adaptations

Aerial adaptations : Birds are adapted for aerial mode of life. Some of three adaptations are :

1. Bones are hollow containing air cavities to make body light.
2. Birds have feathers and wings to fly. Their forelimbs are modified to function as wings.
3. They have sharp eye sight. E.g. eagles can spot their prey from a great height.
4. Joints in the bones are completely fused.

On the basis of habitats, plants are divided into three categories :
1. Hydrophytes : These are plants which grow in water i.e. Lotus, Eicchornia, Hydrilla, water chestnut (singhara), etc.

2. Mesophytes : These are plants which like moderate temperature and sufficient water. These plants dominate other plants. Almost all herbs, shrubs, trees are placed under this category. The plants you see and those found in countryside and forests, all come under this category

3. Xerophytes : These are land plants that are found in deserts or areas with very little water or moisture. Most of them have fleshy stems and leaves change into spines to avoid loss of water.

Types of animals on the basis of habitat : On the basis of habitats, the animals are also divided into four categories. These are :
1. Aquatic : These animals live in water. If taken out of water, they die.
Examples are fishes, whale, molluscs, starfish, etc.
2. Terrestrial : These animals live on land. Horse, cow, buffalo, cat, dog, giraffe, lion, squirrel, camel along with host of other animals belong to this group.
3. Amphibian : These are the organisms which can live both on land as well as in water. Frog and toad are examples of this group.
4. Arboreal : Monkeys, squirrels, some spiders, a few snakes and a host of other animals are arboreal i.e., they live on trees.

Characteristics of Living Things : Human beings, animals and plants all need food to survive. Trees, creepers, birds, flowers, insects, animals and seeds are all livings things. Soil, bench, water, air and dry leaves are all nonlivings things. The characteristics of livings things are:

Livings Things Need Food : Livings things need food to survive and grow.
Food makes the body grow faster, and gives energy to the body to help it perform the life activities. For example, plants produce their own food by the process of photosynthesis, and grow. Animals depend on plants and other food for their survival.

Livings Things Grow : As living things take food, they get more and more energy and grow faster. All living things grow continuously.

Livings Things Respire : Respiration is the process of breathing in and out. Living things take oxygen into the body as they breathe in and release carbon dioxide as they breathe out. The oxygen that enters the body during respiration helps the body to create energy from the food consumed. Some animals have special organs that help them in the process of respiration.
For example, the gills of fish help them to absorb oxygen dissolved in water.
Earthworms breathe through their skin. Plants have tiny pores on the leaves that help them to breathe.
Plants respire day and night, but breathe out oxygen during the day. Plants release more oxygen while producing their food than they release during respiration.

Livings Things Respond to Stimuli : Stimulus is a change of some kind in the environment of a living organism. Every living thing responds in some way or the other to stimuli. The response in plants to stimulus can be observed easily.
For example, a plant called touch-me-not closes its leaves when touched. Also, the Evening Primrose blooms only during the night, while the flowers of Mentzelia Mollis close after sunset.

Livings Things Excrete : The process of eliminating wastes from the body is called excretion. Livings things need food, but they only absorb some amount of it for various processes, while the remaining food needs to be eliminated from the body. For example, plants eliminate harmful waste substances in the form of secretions such as resins and gums, whereas some plants store the harmful substances without any difficulty.

Livings Things Reproduce : All livngs things reproduce. Some animals lay eggs, while others reproduce by giving birth to young ones. Plants produce seeds that can germinate into a new plant, but there are some, such as potato and rose plants, which reproduce through other parts.

Livings Things Move : Even though plants are livings things, they cannot move as their roots are fixed in the soil. However, the substances produced and required for their growth, such as water, minerals and food, move from one part of a plant to another. Some plants show some restricted movement. Animals have various modes of locomotion.

Livings Things Die : All livings things must die one day or another. Plants and animals die.
All livings things possess these characteristics, whereas non-livings do not have these characteristics.

Keywords
• Ecology : Study of relationship between living things and their environment.
• Adaptation : Feature that helps an organism survive in a place where the conditions for the existence of a living organism are present.
• Habitat : A place where the conditions for the existence of a living organism are present.
• Hibernation : A period of rest and sleep during winter months by an organism.

Unit-9 THE LIVING ORGANISMS AND THEIR SURROUNDINGS

Q1) Fill in the blanks:

1. Name a plant that can be grown in hot regions _________.

2. _______ and ________ are animals that can be seen in mountains.

3. The surroundings where an organism lives is called its __________.

4. The two components of environment are __________ an __________components.

5. The process by which plants lose water is __________.

6. The process by which green plants prepare their own food is __________.

7. An animal which can survive in various climatic conditions is __________.

8. An animal like lion that eats other animals is called _______ and the animal that is eaten is called _______.

9. Dolphins breathe in air through __________.

10.Changes in our surroundings that make us respond to them are called __________.

Q2) Define adaptation. Write the adaptive features of a camel which help it to survive in a desert.

Q3) Explain acclimatization with the help of an example.

Q4) How do plants and animals obtain oxygen in saline water?

Q5) Explain how camel conserves water.

Q6) How do desert animals like rats and snakes escape from the intense heat during the day?

Q7) Name and explain the two types of habitats. Give example of a plant and an animal in each of these habitats.

Q8) What are the main abiotic factors required for the growth of plants?

Q9) How are cactus adapted to survive in a desert?.

Q10) What is the role of roots in terrestrial plants? How is it different from aquatic plants?

Q11) What features of a deer which help it to escape its predators in a grassland?

Q12) Explain how dolphins and whales breathe in air.

Q13) Write the structural adaptations of leaves in aquatic plants.

Q14) Write two adaptations found in stems of aquatic plants.

Q15) How are frogs adapted to live on both land and water?

Q16) What will happen if an organism is unable to adjust with its surroundings?

Q17) List the characteristics that are common to all living things.

Q18) Give some examples of responses of plants towards changes in their surroundings?

Q19) Define:
• Stimuli
• Excretion
• Reproduction
• Respiration

Q20) Give two examples each of animals which
(i) Give birth to young ones and
(ii) Produce their young ones through eggs.

Q21) Give two examples of plants which can reproduce through cuttings.

Q22) Explain an activity to show how sunlight affects the growth of a plant which is kept near a window.

Q23) When we push our hand deep inside a sack of wheat,we feel warm.Why?

Multiple Choice Questions

Question. Select the characteristics that a plant adapt to survive in desert
(a) its leaves are modified into spines
(b) its stem is covered with thick waxy layer
(c) its root penetrate deep into the ground
(d) All of the above
Answer : D

Question. Polar bear lives at
(a) north pole only
(b) south pole only
(c) both north pole and south pole
(d) both at north pole, south pole and also some forests
Answer : A

Question. From amongst the following, select the abiotic components
(i) Air (ii) Water
(iii) Heat (iv) Sunlight
(a) (i) and (ii) only
(b) (ii) and (iii) only
(c) (iii) and (iv) only
(d) All of these
Answer : D

Question. Select an animal whose body is not streamlined.
However when they move in water they make the body shape streamlined.
(a) Squids
(b) Octopus
(c) Both of these
(d) None of these
Answer : C

Question. Select a process in which there is no increase in amount of carbon dioxide in air
(a) Breathing
(b) Respiration
(c) Photosynthesis
(d) Decay of vegetation
Answer : C

Question. Which of the following is/are terrestrial habitats?
(a) Forests
(b) Grasslands
(c) Desert
(d) All of these
Answer : D

Question. Which of the following are/is biotic components of a habitat?
(a) Lion
(b) Tiger
(c) Plants
(d) All of these
Answer : D

Question. The rest period which many seeds undergo before they begin to grow is called
(a) Viability
(b) Germination
(c) Pollination
(d) Dormancy
Answer : D

Question. Germination means
(a) the beginning of growth of a seed after a period of dormancy
(b) the beginning of a new plant from a seed
(c) Both the above
(d) None of the above
Answer : C

Question. Which of the following is not a long term adaptation?
(a) Feathers in a bird
(b) Tanning of skin
(c) Prehensile tail
(d) Streamlined body
Answer : B

Question. In trees of mountain region, we generally find that
(a) they are cone shaped
(b) they have non-sloping branch
(c) they have needle like leaves
(d) only (a) and (c) are correct
Answer : D

Question. A snow leopard
(a) has thick fur on its body but not on its feet & toes
(b) has thick fur on its body including its feet and toes
(c) Both the above
(d) None of the above
Answer : B

Question. The long legs of a camel
(a) help it to move fast
(b) help it to keep its body away from heat of sand
(c) help it to defend itself from its enemies
(d) All of the above
Answer : B

Question. Which of the following is correct for frogs?
(a) They usually have ponds as their habitat.
(b) They have strong front legs.
(c) Both the above
(d) None of these
Answer : A

Question. An instrument used for measuring the rate of transpiration is a
(a) Potometer
(b) Klinometer
(c) Hygrometer
(d) Osmometer
Answer : A

Question. The sugar and starch content in leaves would be at its lowest
(a) at mid morning
(b) in early afternoon
(c) in early evening
(d) at dawn
Answer : D

Question. Frog belongs to which category?
(a) Terrestrial
(b) Aquatic
(c) Amphibians
(d) Aerial
Answer : C

Question. An example of a predator is a
(a) mouse
(b) lion
(c) rabbit
(d) deer
Answer : B

Question. On land the frog respires mainly by means of its
(a) skin
(b) lungs
(c) gills
(d) mouth
Answer : B

Question. If a green leaf of a land plant is immersed in water, which of the following processes do not take place?
(a) Respiration
(b) Photosynthesis
(c) Transpiration
(d) None of these
Answer : D

Question. The adaptation that helps a polar bear to locate its prey is ________ .
(a) its very strong sense of smell
(b) its long, curved and sharp claws
(c) its white fur that is not easily visible in the snowy white back ground
(d) layer of fat under its skin
Answer : A

Question. Which of the following adaptation is not shown by polar bear?
(a) Its body is streamlined.
(b) It has two thick layers of fur.
(c) It has long, curved and sharp claws.
(d) It has a layer of fat under the skin.
Answer : A

Question. A camel is a desert animal. It shows many adaptations. Which of the following statements
(P, Q, R & S) is incorrect ?
P - It has a hump where fat is stored.
Q - It can stay without water for long time.
R - It sweats a lot.
S - It excretes large amount of urine.
(a) P only
(b) Q only
(c) P & Q
(d) R & S
Answer : D

Question. In desert plants, the process of photosynthesis is carried out by
(a) leaves
(b) roots
(c) stems
(d) branches
Answer : C

Question. In which of the following animals the breathing process is similar to that of human beings?
(a) Cows
(b) Earthworm
(c) Fish
(d) None of these
Answer : A

Question. In earthworm the process of breathing occurs
(a) through its nose
(b) through its skin
(c) through its mouth
(d) None of these
Answer : B

Question. Respiration in plants take place
(a) only during day time
(b) only during night time
(c) day and night
(d) only in presence of sunlight
Answer : C

Question. Exchange of gases in plants take place through tiny pores on leaves called _________.
(a) holes
(b) stomata
(c) veins
(d) None of these
Answer : B

Question. Frog catches its prey with the help of ________.
(a) teeth
(b) legs
(c) mouth
(d) tongue
Answer : D

Question. What type of leaves are present in submerged plants?
(a) Spinous
(b) Narrow, long and thin
(c) Thick
(d) Having layer of wax like substance
Answer : B

Question. Horse : Terrestrial : : Tortoise : _____________
(a) Terrestrial
(b) Aquatic
(c) Amphibians
(d) Vertebrate
Answer : C

Question. The adaptations observed in animals living in mountain habitat are/is
(a) they have thick skin and fur
(b) they have scales on their bodies
(c) Both the above
(d) None of the above
Answer : A

Question. When a seed is buried in the soil, in which direction will its root and stem grow?
Root Stem
(a) Towards earth Away from earth
(b) Away from earth Towards earth
(c) Towards earth Towards earth
(d) Away from earth Away from earth
Answer : A

Question. The stems of plant are long, hollow and light, and its root are much reduced in size. It is adapted to which one of the following habitats?
(a) Desert
(b) Terrestrial
(c) Aquatic
(d) None of these
Answer : C

Question. A plant shows the following features
(i) roots are reduced in size
(ii) stems are long
(iii) stems have no spaces
(iv) leaves are large and flat
To which category does this plant belong to?
(a) Polar region
(b) Desert
(c) Rainforest
(d) Oceans
Answer : D

Question.

The plant shows
(a) Phototropism
(b) Geotropism
(c) Photosynthesis
(d) Respiration
Answer : A

Question. Select the incorrect statement.
In cactus plants,
(a) the process of photosynthesis is generally carried out by leaves.
(b) the process of photosynthesis is generally carried out by stems.
(c) the stem is covered with a thick waxy layer. 
(d) All of the above
Answer : B

Question. Which of the following statement(s) is/are correct?
(a) Xerophytes refers to desert plants and animals.
(b) There are no roots in desert plants.
(c) Desert plants do not show the process of transpiration.
(d) In mountains regions we see different kinds of adaptations at different heights.
Answer : D

Question. Earthworm breathes through
(a) gills
(b) skin
(c) lungs
(d) stomata
Answer : B

Question. The structure marked X in the given picture is involved in

(a) Exchange of gases during respiration
(b) Release of water
(c) Exchange of gases during photosynthesis
(d) Both (a) and (c)
Answer : D

Question. A plant that loses very little water through transpiration and has very small leaves is adapted to which of the following habitats?
(a) Mountain regions
(b) Grasslands
(c) Forests
(d) Deserts
Answer : D

Question. The type of habitat that is very cold and windy and in some areas of which snowfall occurs in winters is
(a) mountain regions
(b) grasslands
(c) forests
(d) deserts
Answer : A

Question. Plants do not move from one place to another in search of food and shelter. Some plants like Mimosa (Touch-me-not) show leaf movements.
A sunflower always faces the sun. From the above paragraph what can be concluded?
(a) Plants can move their body parts
(b) Plants response to stimulus
(c) Plants show locomotion
(d) Both (a) and (b)
Answer : D

Question. Small changes take place in the body of a single organism over short period to overcome small problems due to changes in environment is called 
(a) Habitat
(b) Adaptation
(c) Acclimatization
(d) Habit
Answer : C

Question. How many parts are there in a stamen?
(a) 1
(b) 2
(c) 3
(d) 4
Answer : B

Question. Which of the following statement(s) is/are correct?
(a) Ponds, swamps and lakes are examples of aquatic habitats.
(b) There is no variations in the habitats located in different parts of the world.
(c) A biotic community consists of a single population.
(d) Sunlight and heat are biotic components of a habitat.
Answer : A

Question. Which of the following statement(s) is/are correct?
(a) The body structure of a camel helps it to survive in a desert.
(b) The dung of camel is dry.
(c) Camels do not sweat.
(d) All of the above
Answer : D

Question. An animal that live in grasslands, has strong teeth for chewing hard plant stems and has long ears to hear movement of predators is
(a) Lion
(b) Tiger
(c) Deer
(d) All of these
Answer : C

Question. Which of the following statement(s) is/are correct?
(a) Lions have long claws in their back legs.
(b) Deer live in forests.
(c) Mountain goat has weak hooves.
(d) All of the above
Answer : B

Question. Which of the following statement(s) is/are correct?
(a) Sea animals can move easily in water because they have a streamlined body.
(b) The body of octopus is streamlined.
(c) The body of squids is streamlined.
(d) All of the above
Answer : A

Question. The aquatic plants are buoyant because
(a) their stems are soft and spongy containing air cavities
(b) they have hollow stalk and huge disc like leaves which help the plant to float on water
(c) Both the above
(d) None of these
Answer : C

Question. How does burrowing habit help desert animals to survive hot and dry conditions?
(a) The holes and burrows are comparatively cooler and moist
(b) By remaining in burrows during day time 
(c) Both the above
(d) None of these
Answer : C

Question. It is an aquatic animal. It has no gills. They breathe in air through their nostrils or blow holes. It is
(a) Dolphins
(b) Octopus
(c) Both of these
(d) None of these
Answer : A

Question. How many parts are there in a pistil?
(a) 1
(b) 3
(c) 4
(d) 5
Answer : B

Question. How many mid-ribs are there in a leaf?
(a) 1
(b) 2
(c) 3
(d) 4
Answer : A

Unit-9 THE LIVING ORGANISMS AND THEIR SURROUNDINGS

Q1) Fill in the blanks:

1. Name a plant that can be grown in hot regions __________.

2. __________ and __________ are animals that can be seen in mountains.

3. The surroundings where an organism lives is called its __________.

4. The two components of environment are __________ and __________components.

5. The process by which plants lose water is __________.

6. The process by which green plants prepare their own food is __________.

7. An animal which can survive in various climatic conditions is __________.

8. An animal like lion that eats other animals is called __________ and the animal that is eaten is called __________.

9. Dolphins breathe in air through __________.

10.Changes in our surroundings that make us respond to them are called __________.

Q2) Define adaptation. Write the adaptive features of a camel which help it to survive in a desert.

Q3) Explain acclimatization with the help of an example.

Q4) How do plants and animals obtain oxygen in saline water?

Q5) Explain how camel conserves water.

Q6) How do desert animals like rats and snakes escape from the intense heat during the day?

Q7) Name and explain the two types of habitats. Give example of a plant and an animal in each of these habitats.

Q8) What are the main abiotic factors required for the growth of plants?

Q9) How are cactus adapted to survive in a desert?.

Q10) What is the role of roots in terrestrial plants? How is it different from aquatic plants?

Q11) What features of a deer which help it to escape its predators in a grassland?

Q12) Explain how dolphins and whales breathe in air.

Q13) Write the structural adaptations of leaves in aquatic plants.

Q14) Write two adaptations found in stems of aquatic plants.

Q15) How are frogs adapted to live on both land and water?

Q16) What will happen if an organism is unable to adjust with its surroundings?

Q17) List the characteristics that are common to all living things.

Q18) Give some examples of responses of plants towards changes in their surroundings?

Q19) Define:
• Stimuli
• Excretion
• Reproduction
• Respiration

Q20) Give two examples each of animals which
(i) Give birth to young ones and
(ii) Produce their young ones through eggs.

Q21) Give two examples of plants which can reproduce through cuttings.

Q22) Explain an activity to show how sunlight affects the growth of a plant which is kept near a window.

Q23) When we push our hand deep inside a sack of wheat,we feel warm.Why?