Question 41 of 89
Excretory Products And Their Elimination
Select the correct statement:
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Year-wise Biology practice
NEET (Oct)2020 Biology PYQs
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89 questions in this collection · Page 5 of 9
Question 42 of 89
Locomotion And Movement
Select the incorrectly matched pair from following:
AI-generated explanation. Check against your textbook.
Explanation:
Chondrocytes are the cells of cartilage, not smooth muscle. In NCERT, chondrocytes reside in cartilage matrix and maintain cartilage tissue. Neurons are nerve cells, Fibroblasts form the connective tissue fibers in areolar tissue, and Osteocytes are mature bone cells in bone tissue. Thus, option 1 is incorrect because it mismatches cartilage cells with smooth muscle cells.
🧠 Did You Know?
cartilage provides flexible support and is avascular, with chondrocytes in lacunae maintaining the matrix.
💡 NCERT Memory Line:
Chondrocytes are the cells of cartilage; osteocytes are bone cells; neurons are nerve cells; fibroblasts form fibers in connective tissues like areolar tissue.
Question 43 of 89
Locomotion And Movement
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 |
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Question 44 of 89
Neural Control And Coordination
Which of the following is associated with decrease in cardiac output?
AI-generated explanation. Check against your textbook.
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.
Question 45 of 89
Neural Control And Coordination
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 |
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Question 46 of 89
Chemical Coordination And Integration
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 |
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Question 47 of 89
Chemical Coordination And Integration
Hormones stored and released from neurohypophysis
are:
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Question 48 of 89
Reproduction In Organisms
Vegetative propagule in Agave is termed as:
AI-generated explanation. Check against your textbook.
Explanation:
In Agave, the vegetative propagule is called a bulbil. A bulbil is a small bulb-like shoot that forms on the plant and can develop into a new plant when separated. This concept is described in NCERT under vegetative propagation, where bulbil formation is noted for certain plants like Agave. The other options are different structures: a rhizome is an underground stem; an offset is a small plant produced at the base of the parent (common in some aquatic or succulent plants); an eye is a bud or a part of a stem that can give rise to a new shoot. Thus bulbil is the correct term for Agave’s vegetative propagule.
🧠 Did You Know?
Some plants produce plantlets or bulbils that can detach and grow elsewhere, aiding rapid propagation without seeds.
💡 NCERT Memory Line:
Bulbil is a type of vegetative propagule mentioned in NCERT to describe a bulb-like shoot that forms on the plant.
Question 49 of 89
Sexual Reproduction In Flowering Plants
Which of the following is incorrect for wind-pollinated plants?
AI-generated explanation. Check against your textbook.
Explanation:
The incorrect statement is option 2. NCERT explains that wind-pollinated flowers are not showy, with small flowers, exposed stamens, and a feathery stigma to catch pollen. They produce large amounts of light, smooth pollen (non-sticky) and pollen is wind-dispersed. The number of ovules is not emphasized as a characteristic feature in wind pollination; typically, these plants do not rely on visual attraction for pollination, so having many ovules per ovary is not a defining trait highlighted in NCERT for wind-pollinated plants.
🧠 Did You Know?
Wind-pollinated flowers are usually inconspicuous and lack nectar, unlike many insect-pollinated flowers.
💡 NCERT Memory Line:
Wind-pollinated flowers: exposed stamens, feathery stigma, small and dull flowers, pollen light and non-sticky.
Question 50 of 89
Sexual Reproduction In Flowering Plants
In some plants thalamus contributes to fruit formation. Such fruits are termed as:
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