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Study Material for Class 7 Science Chapter 1 Nutrition in Plants
Class 7 Science students should refer to the following Pdf for Chapter 1 Nutrition in Plants in Class 7. These notes and test paper with questions and answers for Class 7 Science will be very useful for exams and help you to score good marks
Class 7 Science Chapter 1 Nutrition in Plants
Class 7 Nutrition in Plants Notes for exams. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations. Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.
NUTRITION IN PLANTS
Nutrition- the process of manufacturing/taking in and utilizing food for various life processes.
TYPES OF NUTRITION
Autotrophic- In this process green plants take in inorganic substances like water, carbon dioxide, sunlight and chlorophyll and convert it to organic substances like glucose and oxygen is given out in the reaction.
1) Plants need soil and atmosphere to grow.
2) They get water and minerals from the soil in raw form-
3) They get oxygen from atmosphere.
4) They get light and temperature from sun.
5) They have a green pigment, which is in abundance in their leaves.
6) Plants collect the raw material and cook their food in the leaves.
Heterotropic - In this process non- green plants and animals depend on green plants for their food. Heterotrophic mode of nutrition can be seen in different forms
1. Parasitic mode
2. Saprophytic mode
3. Carnivorous mode
4. Symbiotic mode
Parasitic mode- there are certain plants like cuscuta that depends on other plants for their nutrition.These parasitic plants do not have chlorophyll. They are pale yellow in colour.They have special structures that help them to extract nutrition from other plants.
In parasitic mode of nutrition the organism which derives nutrients is called a Parasite.The organism which the parasite depends is called a Host.Parasitic plants have specialised structures called haustortia to obtain food from their host plants
Saprotrophic mode
iscalled saprophytic nutrition and such plants are called saprophytes. These plants releases enzymes outside their body , digest the organic matter and absorb them i.e. extracellular digestion.
absorbed and used by autotrophs.We can say that saprotrophshelp reuse and recycle the organic material.
Carnivorous plants:
In some areas soil is deficient in certain nutrients, especially nitrogen. Hence plants growing in such areas need to obtain same from other sources Carnivorous plants are those plants that derive some of its nutrients by trapping and consuming animals, mainly insects. Therefore such plants are called insectivorous plants.
Some common examples are the pitcher plant, Drosera(sundew), bladderwort, and the venus fly trap.
Plants requirement for nitrogen is supplied by the digested insects.Unlike parasitic plants like cuscuta,the pitcher plant has chlorophyll.
Symbiotic plants:
Some symbiotic plants demonstrate a win-win kind of interdependence. The most beautiful aspect is that this interdependence can be between a plant and bacteria or plant and fungus.
Symbiotic relationship is a close association between individuals of different species. The relationship is based on the nutritional benefits they derive from each other. For Example-Rhizobium and Legume plants.
A gram and pea plants are common examples of legumes. Legumes growing in soil develop modules in their roots which harbor bacteria called Rhizobium. The bacterium has the ability to
convert nitrogen from the air to an absorbable form. While the bacteria provide usable nitrogen for the plant, in return it gets appropriate condition for its survival in the root nodule.
The most well known example of a symbiosis is that of fungi and algae is the lichen. The fungus component of the lichen is referred to as the mycobiont and the algal component is called phycobiont. The algal partner makes food and provides it to fungi and in return fungi provides water, minerals and shelter to alga.
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CBSE Class 7 Science Chapter 1 Nutrition in Plants Study Material
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