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NEET Biology (Oct)2020 PYQs
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89 questions in NEET (Oct)2020
Select the correct statement:
A
Atrial Natriuretic Factor increases the blood pressure.
B
Angiotensin II is a powerful vasodilator.
C
Counter current pattern of blood flow is not observed in vasa recta.
D
Reduction in Glomerular Filtration Rate activates JG cells to release renin.
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Select the incorrectly matched pair from following:
A
Chondrocytes - Smooth muscle cells
B
Neurons - Nerve cells
C
Fibroblast - Areolar tissue
D
Osteocytes - Bone cells
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Match the following columns and select the correct option:
Column-I
Column-II
(A)Gout
(I)Decreased levels of estrogen
(B)Osteoporosis
(II)Low Ca++ ions in the blood
(C)Tetany
(III)Accumulation of uric acid crystals
(D)Muscular dystrophy
(IV)Auto immune disorder
(V)Genetic disorder
A
(A)-(II), (B)-(I), (C)-(III), (D)-(IV)
B
(A)-(III), (B)-(I), (C)-(II), (D)-(V)
C
(A)-(IV), (B)-(V), (C)-(I), (D)-(II)
D
(A)-(I), (B)-(II), (C)-(III), (D)-(IV)
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Which of the following is associated with decrease in cardiac output?
A
Sympathetic nerves
B
Parasympathetic neural signals
C
Pneumotaxic centre
D
Adrenal medullary hormones
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Explanation: Decrease in cardiac output occurs mainly when parasympathetic neural signals to the heart prevail. The vagus nerve slows the heart rate (and reduces contraction strength), lowering cardiac output. In NCERT, the parasympathetic system reduces heart rate and thus CO. Sympathetic nerves increase heart rate and force of contraction, raising CO. Adrenal medullary hormones (adrenaline) also increase heart rate and strength, again increasing CO. The pneumotaxic centre primarily regulates breathing patterns, not directly cardiac output, so it does not cause a decrease in CO by itself. Therefore, option 2 is correct.
🧠 Did You Know? Parasympathetic effects on the heart are mediated by muscarinic receptors that slow heart rate.
💡 NCERT Memory Line: Parasympathetic (vagal) activity decreases heart rate and cardiac output; sympathetic activity increases them.
Match the following columns and select the correct option:
Column-I
Column-II
(A)Rods and Cones
(I)Absence of photoreceptor cells
(B)Blind Spot
(II)Cones are densely packed
(C)Fovea
(III)Photoreceptor cells
(D)Iris
(IV)Visible coloured
portion of the eye
A
(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
B
(A)-(II), (B)-(III), (C)-(I), (D)-(IV)
C
(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
D
(A)-(II), (B)-(IV), (C)-(III), (D)-(I)
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Match the following columns and select the correct option:
Column-I
Column-II
(A)Pituitary hormone
(I)Steroid
(B)Epinephrine
(II)Neuropeptides
(C)Endorphins
(III)Peptides, proteins
(D)Cortisol
(IV)Biogenic amines
A
(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
B
(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
C
(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
D
(A)-(iii), (B)-(IV), (C)-(I), (D)-(II)
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Hormones stored and released from neurohypophysis
are:
A
Thyroid stimulating hormone and Oxytocin
B
Oxytocin and Vasopressin
C
Follicle stimulating hormone and Leutinizing hormone
D
Prolactin and Vasopressin
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Vegetative propagule in Agave is termed as:
A
Rhizome
B
Bulbil
C
Offset
D
Eye
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Which of the following is incorrect for wind-pollinated plants?
A
Well exposed stamens and stigma
B
Many ovules in each ovary
C
Flowers are small and not brightly coloured
D
Pollen grains are light and non-sticky
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In some plants thalamus contributes to fruit formation. Such fruits are termed as:
A
False fruits
B
Aggregate fruits
C
True fruits
D
Parthenocarpic fruit
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