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NEET • BIOLOGY • ORGANISMS AND POPULATION
Organisms and population practice · Hard
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31
Hard
31 of 34
Remembering
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Casuarina equisetifolia is which one of the following.
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Correct option: B
Xerophyte
Option B (Xerophyte) is correct because Casuarina equisetifolia is adapted to arid environments and exhibits xerophytic characteristics.
32
Hard
32 of 34
Remembering
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Within biological communities, some species are important in determining the ability of a large number of other species to persist in the community. Such species are called:
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Correct option: A
Keystone species
Option A (Due to limiting factors) is correct because when a population reaches carrying capacity, it fluctuates due to the influence of limiting factors such as food, space, and resources.
33
Hard
33 of 34
Understanding
+4 | -1
Assertion: Daphnia populations in a water
body, at different seasons of a year showed
marked variations in their body morphology.
Reason: Cyclomorphosis in some organisms is
influenced by the variations in temperatures
prevailing in their water-bodies at different
seasons.
body, at different seasons of a year showed
marked variations in their body morphology.
Reason: Cyclomorphosis in some organisms is
influenced by the variations in temperatures
prevailing in their water-bodies at different
seasons.
View answer and explanation
Correct option: A
If both Assertion and Reason are true and
Reason is the correct explanation of Assertion
Reason is the correct explanation of Assertion
Option A (If both Assertion and Reason are true and Reason is the correct explanation of Assertion) is correct because cyclomorphosis (variations in body morphology) in Daphnia is influenced by temperature variations in their water bodies.
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Hard
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Understanding
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[A]: Many desert mammals cool the exhaled air in their noses, before it is expelled out through nostrils.
[R]: The moisture condenses in the nose and is not lost as water vapours along with the exhaled air.
[R]: The moisture condenses in the nose and is not lost as water vapours along with the exhaled air.
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Correct option: A
Both A and R are true and R is the correct explanation of A
The correct answer is A (Both A and R are true and R is the correct explanation of A) because desert mammals conserve water by cooling exhaled air in their noses, allowing moisture to condense and be retained.
Revision notes and key takeaways
Review ORGANISMS AND POPULATION in your textbook or class notes, then use this set to check your understanding.
Showing 31-34 of 34 questions