NEET Biology MCQs For Full Syllabus Set B

Question:

Which element is located at the centre of the porphyrin ring in chlorophyll?

• a)

  Magnesium

• b)

  Calcium

• c)

  Manganese

• d)

  Potassium

Answer:

Magnesium

Question:

Nitrifying bacteria

• a)

  oxidise ammonia to nitrate

• b)

  liberate ammonia

• c)

  change ammonia into ionic form

• d)

  oxidise ammonia to nitrite

Answer:

oxidise ammonia to nitrate

Question:

Nitrogen cycle involves many compounds. Which illustration correctly depicts the nitrogen cycle?

• a)

  

• b)

  

• c)

  

• d)

  None of these

Answer:

Question:

 The given table enlists some microorganisms and the step in which they are involved during theprocess of nitrogen cycle.

• a)

  i- Denitrification ii- Nitrobacter

• b)

  i- Ammonification ii- Nitrobacter

• c)

  i- Ammonification ii- Rhodospirrillum

• d)

  i- Denitrification ii- Rhodospirrillum

Answer:

i- Denitrification ii- Nitrobacter

Question:

Which of the following statements about macronutrients and micronutrients is correct?

• a)

  Toxicity is induced in a plant when micronutrients are present in excess amounts, but this is not the case when large amounts of macronutrients are present

• b)

  Examples of micronutrients include magnesium and calcium, and examples of macronutrients include silicon and selenium

• c)

  Micronutrients are required in quantities more than 10 mmol kg”1, while macronutrients are required in quantities less than 10 mmol kg”1.

• d)

  Micronutrients from the structural components of a plant body, while macronutrients act as cofactors of enzymes or metal activators

Answer:

Toxicity is induced in a plant when micronutrients are present in excess amounts, but this is not the case when large amounts of macronutrients are present

Question:

• a)

  III

• b)

  IV

• c)

  II

• d)

  I

Answer:

III

Question:

• a)

  blue and red regions of visible light

• b)

  red and yellow regions of visible light

• c)

  green and blue regions of visible light

• d)

  yellow and green regions of visible light

Answer:

blue and red regions of visible light

Question:

There are two groups of photosystems that take part in photosynthesis, photosystem I and photosystem II. Which of the following statements represents the major difference between
photosystem I (PS I) and photosystem II (PS II)?

• a)

  PS I has a reaction centre P₇₀₀ whereas PS II has reaction centre P₆₈₀

• b)

  PS I contains chlorophyll a whereas PS II contains chlorophyll b

• c)

  PS I occurs on the inner thylakoid surface whereas PS II occurs on the outer thylakoid surface

• d)

  PS I takes part in non-cyclic photophosphorylation whereas PS II takes part in cyclic photophosphorylation

Answer:

PS I has a reaction centre P₇₀₀ whereas PS II has reaction centre P₆₈₀

Question:

The enzyme RuBisCo acts as an oxygenase when the

• a)

  concentration of carbon dioxide is low and that of oxygen is high

• b)

  concentration of carbon dioxide is high and that of oxygen is low

• c)

  concentrations of both oxygen and carbon dioxide are high

• d)

  concentrations of both oxygen and carbon dioxide are low

Answer:

concentration of carbon dioxide is low and that of oxygen is high

Question:

C₃ pathways require ____I____ ATP for CO₂ fixation while C₄ pathways require ____II____ ATP or CO₂ fixation. Which of the following alternative complete the statement above?

• a)

  i-3 ii-5

• b)

  i -2 ii-3

• c)

  i-5 ii-2

• d)

  i-3 ii-2

Answer:

i-3 ii-5

Question:

Anthony and his classmates decided to study the effect of amount of carbon dioxide on the growth of plants. For this purpose, they grew sugarcane in controlled environment and measured the amount of sugar content at different concentrations of carbon dioxide. Which graph represents the sugar content in sugarcane and the concentration of carbon dioxide correctly?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

Which is the correct equation of photosynthesis?

• a)

  

• b)

  

• c)

  

• d)

  None of the above

Answer:

Question:

The correct molecular formula of chlorophyll-a is

• a)

  

• b)

  

• c)

  

• d)

  None of these

Answer:

Question:

Most plants are green in colour because

• a)

  Chlorophyll is least effective in absorbing green light

• b)

  Green light allows maximum photosynthesis

• c)

  Green light is the most effective wave length region of the visible spectrum of sunlight for photosynthesis

• d)

  The atmosphere filters out all the colours of the visible light spectrum except green

Answer:

Chlorophyll is least effective in absorbing green light

Question:

During glycolysis, the fructose-6-phosphate is converted to fructose-1,6-diphosphate in the presence of ATP and the enzyme phospho-fructokinase. What is the described reaction known as?

• a)

  Phosphorylation reaction

• b)

  Dehydration reaction

• c)

  Isomerisation reaction

• d)

  Dephosphorylation reaction

Answer:

Phosphorylation reaction

Question:

• a)

  i- Pyruvic dehydrogenase ii- Acetyl CoA

• b)

  i- Pyruvic dehydrogenase ii- Succinyl CoA

• c)

  i- Pyruvic acid decarboxylase ii- Acetyl CoA

• d)

  i- Pyruvic acid decarboxylase ii- Succinyl CoA

Answer:

i- Pyruvic dehydrogenase ii- Acetyl CoA

Question:

During anaerobic respiration in yeast

• a)

  CO₂C₂H₅OH and energy are the end products

• b)

  Water and CO₂ are the end products

• c)

  H₂O,CO₂ and energy are the only end products

• d)

  None of these

Answer:

CO₂C₂H₅OH and energy are the end products

Question:

Which of the following takes place in Krebs’ cycle?

• a)

  Complete oxidation of acetyl CoA into CO₂ and H₂O with electron transport

• b)

  Complete oxidation of citric acid into H₂O

• c)

  Complete reduction of acetyl CoA into CO₂ and H₂O

• d)

  Complete oxidation of acetyl CoA into CO₂ and H₂O

Answer:

Complete oxidation of acetyl CoA into CO₂ and H₂O with electron transport

Question:

In oxidation of one molecule of glucose during respiration, 36 molecules of ATP are liberated as follows

• a)

  2 ATP molecules outside the mitochondria and 34 ATP molecules inside the mitochondria

• b)

  All the 36 ATP molecules inside the mitochondria

• c)

  2 ATP molecules during glycolysis and 34 ATP molecules during Krebs’ cycle

• d)

  2 ATP molecules during glycolysis and 34 ATP molecules during respiratory chain

Answer:

2 ATP molecules outside the mitochondria and 34 ATP molecules inside the mitochondria

Question:

Which arrow diagram traces the sequence of electrons in the electron transport system during the oxidation of NADH molecule?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a)

  i-two ii-eight

• b)

  i-one ii-two

• c)

  i-five ii-one

• d)

  i- eight ii-five

Answer:

i-two ii-eight

Question:

Four potted plants I, II, III, and IV (of short day plant, which has the critical period of 14 hours) are taken and exposed to light for different time periods as listed in the given table.

Which potted plant will show flowering after exposure to light?

• a)

  IV

• b)

  III

• c)

  II

• d)

  I

Answer:

IV

Question:

Gibberellic acid induces flower

• a)

  In long day plants under short day conditions

• b)

  In some gymnospermic plants only

• c)

  In short day plants under long day conditions

• d)

  In day neutral plants under dark conditions

Answer:

In long day plants under short day conditions

Question:

Levitt performed experiments. He observed that auxin treated cells were able to absorb water even when kept in hypertonic solution. Which explains this observation best?

• a)

  Auxin lowers the water potential of cells

• b)

  Auxin increases the solute potential of cells

• c)

  ATP production increases and therefore much energy is available for active absorption

• d)

  Auxin treated cells lose selective permeability

Answer:

Auxin lowers the water potential of cells

Question:

Which of the following movements is not related to change in auxin levels ?

• a)

  Nyctinastic leaf movement

• b)

  Movement of sunflower tracking the direction of the sun

• c)

  Movement of shoot towards light

• d)

  Movement of roots towards soil

Answer:

Nyctinastic leaf movement

Question:

If a leaf segment of Bryophyllum plant is in soil, it produces new plants. This is because its leaf has

• a)

  Buds

• b)

  High concentration of cytokinins

• c)

  Small embryos

• d)

  High concentration of auxins and cytokinins

Answer:

Buds

Question:

• a)

  I

• b)

  II

• c)

  III

• d)

  IV

Answer:

I

Question:

Morphogenesis is the process of differentiation of tissues and organs in plants. Which ratio of hormones induces plant cell differentiation?

• a)

  Auxins to cytokinins

• b)

  Abscisic acid to cytokinins

• c)

  Abscisic acid to cytokinins

• d)

  Gibberellins to abscisic acid

Answer:

Auxins to cytokinins

Question:

The given diagram illustrates phototropism in a plant. Which plant hormone induces the phenomenon of phototropism in plants?

• a)

  Auxi

• b)

  Ethylene

• c)

  Cytokinin

• d)

  Gibberellins

Answer:

Auxi

Question:

Which arrow diagram represents the sequence of layers in the wall of alimentary canal from the outermost to the innermost?

• a)

  

• b)

  

• c)

  

• d)

  None of these

Answer:

Question:

Which of the following processes is an example of physical digestion?

• a)

  Breakdown of large droplets of fats into smaller ones by bile

• b)

  Breakdown of nucleic acids into nucleotides by nucleases

• c)

  Digestion of proteins by trypsin

• d)

  Digestion of carbohydrates by amylase

Answer:

Breakdown of large droplets of fats into smaller ones by bile

Question:

The part labelled X in the given diagram A is removed from a patient’s body because of some malfunctioning.
How will the given condition affect the process occurring in the structure given in diagram B?

• a)

  Absorption of fats will decrease

• b)

  Absorption of glucose will decrease

• c)

  Digestion of proteins will increase

• d)

  Digestion of nucleic acid will increase

Answer:

Absorption of fats will decrease

Question:

During prolonged fasting

• a)

  First carbohydrates are used up, followed by fat and protein towards end

• b)

  First lipids, followed by proteins and carbohydrate towards end

• c)

  None of the above

• d)

  First fats are used up, followed by carbohydrates from liver and muscles, and proteins in the end

Answer:

First carbohydrates are used up, followed by fat and protein towards end

Question:

The given table enlists various types of dietary nutrients and the enzymes that are used in the process of digestion of these nutrients in the body

• a)

  i- Rennin ii- Trypsin iii- Amylase iv- Lipase

• b)

  i- Lipase ii- Rennin iii- Trypsin iv- Amylase

• c)

  i- Trypsin ii- Amylase iii- Lipase iv- Rennin

• d)

  i- Amylase ii- Lipase iii- Rennin iv- Trypsin

Answer:

i- Rennin ii- Trypsin iii- Amylase iv- Lipase

Question:

Which of the following equations is correct?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a)

  i- Bile ii- Pepsinogen iii- HCl iv- Mucus

• b)

  i- HCl ii- Mucus iii- Bile iv- Pepsinogen

• c)

  i- Mucus ii- Bile iii- Pepsinogen iv- HCl

• d)

  i- Pepsinogen ii- HCl iii- Mucus iv- Bile

Answer:

i- Bile ii- Pepsinogen iii- HCl iv- Mucus

Question:

The given figure illustrates the changes in lung volume during the process of breathing

The change from II to III indicates the

• a)

  movement of air out the lungs

• b)

  movement of diaphragm away from the lungs

• c)

  expansion of the thoracic cavity

• d)

  expansion of ribs

Answer:

movement of air out the lungs

Question:

• a)

  i-45 ii-95

• b)

  i-95 ii-104

• c)

  i-104 ii-159

• d)

  i-159 ii-45

Answer:

i-45 ii-95

Question:

Proportion of volume of carbon dioxide released to volume of oxygen absorbed during respiration is

• a)

  Respiratory quotient

• b)

  Respiratory activity

• c)

  Respiratory exchange

• d)

  Respiratory phase

Answer:

Respiratory quotient

Question:

Which of the following effects is not likely to be a consequence of smoking?

• a)

  Increased ciliary action in the lungs

• b)

  Wheezing

• c)

  Chronic cough

• d)

  Increased mucus secretion in the lungs

Answer:

Increased ciliary action in the lungs

Question:

In which alternative are the structures correctly matched with the respective labels that represent them?

• a)

  i- Pulmonary artery ii- Pulmonary vein iii- Vena cava iv- Dorsal aorta

• b)

  i- Dorsal aorta ii- Pulmonary artery iii- Pulmonary vein iv- Vena cava

• c)

  i- Vena cava ii- Dorsal aorta iii- Pulmonary vein iv- Pulmonary vein

• d)

  i- Pulmonary vein ii- Vena cava iii- Dorsal aorta iv- Pulmonary artery

Answer:

i- Pulmonary artery ii- Pulmonary vein iii- Vena cava iv- Dorsal aorta

Question:

Which of the following arrow diagrams correctly represents the flow of cardiac impulse in the heart?

• a)

  

• b)

  

• c)

  

• d)

  None of these

Answer:

Question:

Blood group-incompatibility can be observed between

• a)

  an Rh negative mother and an Rh positive foetus

• b)

  a pregnant mother with an AB positive group and an Rh positive foetus

• c)

  a pregnant mother with an AB negative group and an Rh negative foetus

• d)

  anRh positive mother and an Rh positive foetus

Answer:

an Rh negative mother and an Rh positive foetus

Question:

The Rh incompatibility can be seen between Rh ____i____ blood of pregnant mother and Rh _____ii____ blood of foetus. The information in which alternative completes the given statement?

• a)

  i- -ve ii-⁺ve

• b)

  i- -ve ii- -ve

• c)

  i- ⁺ve ii- -ve

• d)

  None of these

Answer:

i- -ve ii-⁺ve

Question:

The change that occurred in red blood cells after they were kept in a beaker containing distilled water for 10 minutes is illustrated in the given figure.

Which of the following inferences can be drawn from the observation?

• a)

  The RBCs were placed in a hypotonic solution.

• b)

  The RBCs were placed in a hypertonic solution

• c)

  There was equal movement of water in and out of the RBCs.

• d)

  There was equal movement of solutes in and out of the RBCs.

Answer:

The RBCs were placed in a hypotonic solution.

Question:

What is the excretory organ of crustaceans?

• a)

  Green gland

• b)

  Malpighian tubule

• c)

  Nephridium

• d)

  Kidney

Answer:

Green gland

Question:

Which term is used for referring to the cortex that extends into renal medulla as renal column?

• a)

  Column of Bertini

• b)

  Vasa rectae

• c)

  Loop of Henle

• d)

  Juxtamedullary nephron

Answer:

Column of Bertini

Question:

Which of the following conditions would lead to a decrease in the rate of glomerular filtration?

• a)

  Decrease in diastolic blood pressure

• b)

  Constriction of the efferent arteriole

• c)

  Increase in systolic blood pressure

• d)

  Release of ADH

Answer:

Decrease in diastolic blood pressure

Question:

Which of the following substances is found in urine under normal conditions?

• a)

  Urea

• b)

  Lipid

• c)

  Protein

• d)

  Glucose

Answer:

Urea

Question:

Which part of the kidney plays a role in removing the waste products of metabolism from blood plasma?

• a)

  Nephron

• b)

  Urethra

• c)

  Cortex

• d)

  Ureter

Answer:

Nephron

Question:

The reabsorption of sodium and water in the distal convoluted tubule, which leads to an increase in blood pressure, is a result of the secretion of

• a)

  adrenal cortex

• b)

  anterior pituitary

• c)

  adrenal medulla

• d)

  posterior pituitary

Answer:

adrenal cortex

Question:

Which of the following sequences correctly represents the process of urine formation?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

The counter current system is a system in which the exchange of materials occurs between fluids flowing in opposite directions and separated by a semi permeable membrane. The counter current system in kidneys operates between the

• a)

  descending and ascending limb of Henle

• b)

  distal convoluted tubule and collecting duct

• c)

  ascending limb of Henle and the distal convoluted tubule

• d)

  proximal convoluted tubule and the descending limb of Henle

Answer:

descending and ascending limb of Henle

Question:

Which of the following arrow diagrams correctly represents the movement of filtrate in nephrons to form urine?

• a)

  

  

• b)

  

  

• c)

  

  

• d)

  None of these

Answer:

Question:

Which of the following statements is incorrect about visceral muscles?

• a)

  They are voluntary muscles.

• b)

  They do not get fatigued.

• c)

  They do not exhibit striation

• d)

  They help in transportation of food through the alimentary canal

Answer:

They are voluntary muscles.

Question:

Which of the following pairs of muscles is involuntary in nature?

• a)

  Smooth muscles and cardiac muscles

• b)

  Smooth muscles and skeletal muscles

• c)

  Cardiac muscles and muscles that aid body posture

• d)

  Skeletal muscles and muscles of the alimentary canal

Answer:

Smooth muscles and cardiac muscles

Question:

Four statements about muscle contraction:
I. During muscle contraction, the size of the H-space decreases.
II . During muscle contraction, the size of the sarcomere decreases.
III . During muscle contraction, the length of the A-band decreases.
IV . During muscle contraction, the distance between the adjacent Z lines decreases.
Among the given statements,

• a)

  only III is incorrect

• b)

  I and III are incorrect

• c)

  II and IV are incorrect

• d)

  only IV is incorrect

Answer:

only III is incorrect

Question:

The functional unit of contraction between two successive Z-lines is known as

• a)

  sarcomere

• b)

  myofibril

• c)

  myosin

• d)

  actin

Answer:

sarcomere

Question:

Which contractile protein contains the enzyme ATPase required for muscle contraction?

• a)

  Myosin

• b)

  Actin

• c)

  Troponin

• d)

  Tropomyosin

Answer:

Myosin

Question:

Which of the following statements regarding the characteristics of white muscle fibres is correct?

• a)

  They have an extensive sarcoplasmic reticulum

• b)

  They depend on the aerobic process for energy

• c)

  They have a large number of mitochondria

• d)

  They contain a large amount of myoglobin

Answer:

They have an extensive sarcoplasmic reticulum

Question:

During muscle contraction, the distance between adjacent Z lines _____i____ while there is no change in the length of _____ii____. The information in which alternative completes the given statement?

• a)

  i- decreases ii- A band

• b)

  i- decreases ii- I band

• c)

  i- increases ii- I band

• d)

  i- increases ii- A band

Answer:

i- decreases ii- A band

Question:

During muscle contraction, the size of sarcomere _____i____ and the length of _____ii____ retains its original length. The information in which alternative completes the above statement?

• a)

  i- decreases ii- A band

• b)

  i- decreases ii- I band

• c)

  i- increases ii- I band

• d)

  i- increases ii- A band

Answer:

i- decreases ii- A band

Question:

Muscle contains different types of proteins. These include actin, myosin, tropomyosin and troponin. The ATP binding site is present on the

• a)

  myosin filament

• b)

  actin filament

• c)

  tropomyosin

• d)

  troponin

Answer:

myosin filament

Question:

Which of the following events does not occur during muscle contraction?

• a)

  The thinner filaments are pulled away from the middle of sarcomere

• b)

  The length of the A-band remains constant while the the I-band shortens

• c)

  The Z-line comes close together and the sarcomere contracts

• d)

  The myosin filaments attach to the thin actin filaments

Answer:

The thinner filaments are pulled away from the middle of sarcomere

Question:

Which of the following statements regarding the functions of the vertebral column is incorrect?

• a)

  It helps in the articulation of the upper and lower limbs

• b)

  It provides the surface for the attachment of the ribs

• c)

  It helps in the free movement of the head.

• d)

  It protects the spinal cord

Answer:

It helps in the articulation of the upper and lower limbs

Question:

• a)

  C₇ T₁₂ L₅ S ₁ Co₁

• b)

  C₁₂ T₁ L₇ S ₅ Co₁

• c)

  C₁ T₅ L₁₂ S ₇ Co₁

• d)

  None of these

Answer:

C₇ T₁₂ L₅ S ₁ Co₁

Question:

Which alternative lists the names of the bones present in the hind limb?

• a)

  

• b)

  

• c)

  

• d)

  None of these

Answer:

Question:

Joint between Malleus and incus is

• a)

  Hinge joint

• b)

  Pivot joint

• c)

  Ball and socket joint

• d)

  Gliding joint

Answer:

Hinge joint

Question:

Centrum of 8th vertebra of frog is

• a)

  amphicoelous

• b)

  amphiplatyan

• c)

  acoelous

• d)

  procoelous

Answer:

amphicoelous

Question:

Which of the following systems together controls and coordinates the physiological process?

• a)

  Neural and endocrine

• b)

  Respiratory and endocrine

• c)

  Circulatory and neural

• d)

  Circulatory and respiratory

Answer:

Neural and endocrine

Question:

Neuron is the basic unit of the nervous system. Which part of the neuron contains the synaptic vesicles?

• a)

  Dendrite

• b)

  Nucleus

• c)

  Soma

• d)

  Axon

Answer:

Dendrite

Question:

The illustration represents a type of neuron. The illustration represents which type of neuron?

• a)

  Bipolar neuron

• b)

  Unipolar neuron

• c)

  Multipolar neuron

• d)

  Pseudounipolar neuron

Answer:

Bipolar neuron

Question:

The ions across the resting membrane are regulated by the sodium-potassium pump. The gaining of positive charge on the inner surface and negative charge on the outer surface of the membrane is maintained by the transport of

• a)

  3 Na⁺ ions out of the cell and 2 K⁺ ions into the cell

• b)

  2Na⁺ ions out of the cell and 3K⁺ into the cell

• c)

  2 Na⁺ ions into the cell and 3 K⁺ ions out of the cell

• d)

  None of these

Answer:

3 Na⁺ ions out of the cell and 2 K⁺ ions into the cell

Question:

Which of the following events occurs during the process of repolarization?

• a)

  Na⁺ ions move out and K⁺ ions move into the fibre by active transport

• b)

  K⁺ ions move out and Na+ ions move into the fibre by active transport

• c)

  The amount of Na⁺ ions inside the axonal membrane becomes more than that outside the axonal membrane

• d)

  None of these

Answer:

Na⁺ ions move out and K⁺ ions move into the fibre by active transport

Question:

The axonal membrane is said to be in depolarized state when

• a)

  it is positive inside and negative outside

• b)

  it is positive on both sides of membrane

• c)

  it is negative inside and positive outside

• d)

  it is negative on both sides of membrane

Answer:

it is positive inside and negative outside

Question:

The image illustrates the movement of an impulse in a nerve fibre. The labels, I, II, and III, represent the changes present on either sides of the membrane. When an action potential is generated, because of movement of ions, a positive charge inside and negative charge outside is established.
Immediately after, the membrane returns to its original condition and is said to be repolarized. Resting membrane potential is established when the membrane gains positive charge outside and negative charge inside i.e., the membrane is said to be polarized.
The information in which alternative matches the labels with its respective names correctly?

• a)

  i- Depolarized ii- Repolarized iii- Polarized

• b)

  i- Polarized ii- Repolarized iii- Depolarized

• c)

  i- Depolarized ii- Polarized iii- Repolarized

• d)

  i- Polarized ii- Depolarized iii- Repolarized

Answer:

i- Depolarized ii- Repolarized iii- Polarized

Question:

Which of the following statements about transmission of impulse is correct?

• a)

  It is transmitted from axon of first neuron to dendrite of next neuron.

• b)

  It is transmitted from dendrite of first neuron to axon of next neuron

• c)

  The transmission of impulse is slower in electrical synapse

• d)

  The transmission of impulse is faster in chemical synapse.

Answer:

It is transmitted from axon of first neuron to dendrite of next neuron.

Question:

Which potted plant will show flowering?

The information in which alternative completes the given flowchart?
 

• a)

  i- Receptors ii- Afferent nerve fibres iii- Brain/spinal cord iv- Efferent nerve fibres

• b)

  i- Brain/spinal cord ii- Efferent nerve fibres iii- Afferent nerve fibres iv- Receptors

• c)

  i- Brain/spinal cord ii- Afferent nerve fibres iii- Receptors iv- Efferent nerve fibres

• d)

  None of these

Answer:

i- Receptors ii- Afferent nerve fibres iii- Brain/spinal cord iv- Efferent nerve fibres

Question:

Physical exercise stimulates various factors that increase heartbeats. Which of the following systems is directly stimulated by physical exercise?

• a)

  Sympathetic nervous system

• b)

  Excretory system

• c)

  Sensory system

• d)

  Central nervous system

Answer:

Sympathetic nervous system

Question:

The illustration represents a type of neuron. The illustration represents which type of neuron?

• a)

  Multipolar neuron

• b)

  Pseudounipolar neuron

• c)

  Unipolar neuron

• d)

  Bipolar neuron

Answer:

Multipolar neuron

Question:

The given diagram illustrates the structure of a neuron.

Which labelled structure in the given diagram represents Nodes of Ranvier?

• a)

  I

• b)

  II

• c)

  III

• d)

  IV

Answer:

I

Question:

Myelinated nerve fibres contain myelin sheath, which is made up of Schwann cells. The propagation of nerve impulse through a myelinated nerve fibre is illustrated in which diagram?

• a)

  

• b)

  

• c)

  

• d)

  None of these

Answer:

Question:

• a)

  

• b)

  

• c)

  

• d)

  None of these

Answer:

Question:

The given image is that of a neuron

In which sequence does an impulse on reaching this neuron travel through it?

• a)

  

• b)

  

• c)

  

• d)

  None of these

Answer:

Question:

During the transmission of nerve impulse through a non-myelinated nerve fibre, the potential on the inner side of the nerve fibre in resting, depolarized, and repolarized states respectively will be

• a)

  negative, positive, and negative

• b)

  positive, positive, and negative

• c)

  negative, negative, and positive

• d)

  positive, negative, and positive

Answer:

negative, positive, and negative

Question:

The given diagram illustrates a section of an adrenal gland.

Which of the following hormones is secreted by the structure labelled as “X” in the diagram?

• a)

  Epinephrine

• b)

  Aldosterone

• c)

  Androgen

• d)

  Cortisol

Answer:

Epinephrine

Question:

Aldosterone is the hormone that regulates the rate of reabsorption of sodium ions from the filtrate

Which label represents the gland that secretes aldosterone?

• a)

  III

• b)

  IV

• c)

  II

• d)

  I

Answer:

III

Question:

The hormones labelled, I, II, III, and IV, are secreted by the respective organs listed in the table

The information in which alternative correctly matches the secretions (hormones) by the respective organs?

• a)

  i- Estrogen ii- Progesterone iii- Epinephrine iv- Corticoids

• b)

  i- Estrogen ii- Corticoids iii- Epinephrine iv- Progesterone

• c)

  i- Progesterone ii- Estrogen iii- Corticoids iv- Epinephrine

• d)

  i- Progesterone ii- Epinephrine iii- Corticoids iv- Estrogen

Answer:

i- Estrogen ii- Progesterone iii- Epinephrine iv- Corticoids

Question:

In old age, the vision of eye becomes dim. It is due to

• a)

  Cataract

• b)

  Astigmatism

• c)

  Myopia

• d)

  Hypermetropia

Answer:

Cataract

Question:

Which part of the kidney plays a role in removing the waste products of metabolism from blood plasma?

• a)

  None of these

• b)

  Urethra

• c)

  Cortex

• d)

  Ureter

Answer:

None of these

Question:

What is the excretory organ of crustaceans?

• a)

  Green gland

• b)

  Nephridium

• c)

  Both

• d)

  None of these

Answer:

Green gland