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: A

Question. Nitrifying bacteria
(a) oxidise ammonia to nitrate
(b) liberate ammonia
(c) change ammonia into ionic form
(d) oxidise ammonia to nitrite

Answer: D

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: D

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: A

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: D

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: A

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: C

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: A

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: A

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: D

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: D

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: A

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: A

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: A

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: A

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: A

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: B

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: A

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: D

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: D

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: A

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: B

Question. What is the excretory organ of crustaceans?
(a) Green gland
(b) Malpighian tubule
(c) Nephridium
(d) Kidney

Answer: A

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: A

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: A

Question. Which of the following substances is found in urine under normal conditions?
(a) Urea
(b) Lipid
(c) Protein
(d) Glucose

Answer: A

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: A

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: A

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: C

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: A

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: C

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: A

Question. The functional unit of contraction between two successive Z-lines is known as
(a) sarcomere
(b) myofibril
(c) myosin
(d) actin

Answer: A

Question. Which contractile protein contains the enzyme ATPase required for muscle contraction?
(a) Myosin
(b) Actin
(c) Troponin
(d) Tropomyosin

Answer: A

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: C

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: B

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: B

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: A

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: A

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: C

Question. Joint between Malleus and incus is
(a) Hinge joint
(b) Pivot joint
(c) Ball and socket joint
(d) Gliding joint

Answer: A

Question. Centrum of 8th vertebra of frog is
(a) amphicoelous
(b) amphiplatyan
(c) acoelous
(d) procoelous

Answer: A

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: A

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: A

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: A

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: A

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: B

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: B

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: A

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: D

Question. In old age, the vision of eye becomes dim. It is due to
(a) Cataract
(b) Astigmatism
(c) Myopia
(d) Hypermetropia

Answer: A

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: A

Question. What is the excretory organ of crustaceans?
(a) Green gland
(b) Nephridium
(c) Both
(d) None of these

Answer: A