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Q21. Consider the two statements:

Assertion (A):	It is better to consider the respiratory pathway as an amphibolic pathway rather than as a catabolic one.
Reason (R):	The respiratory pathway is involved in both anabolism and catabolism.

Both(A)and(R)are True and(R)is the correct explanation of(A).
Both(A)and(R)are True but(R)is not the correct explanation of(A).
(A)is True but(R)is False.
Both(A)and(R)are False.

Q22. After the two molecules of pyruvate, produced at the end of glycolysis from one molecule of glucose, enter the mitochondrial matrix and till the Krebs cycle is complete, which of the following will not be a correct number of the corresponding molecule produced?

Eight molecules of NADH + H⁺
Two molecules of FADH₂
Two molecules of ATP
Four molecules of carbon dioxide

Q23. In the taxonomic categories, which hierarchical arrangement in ascending order is correct in the case of animals?

Kingdom, Order, Phylum, Class, Family, Genus, Species
Kingdom, Phylum, Class, Order, Family, Genus, Species
Kingdom, Class, Phylum, Family, Order, Genus, Species
Kingdom, Order, Class, Phylum, Family, Genus, Species

Q24.

Which one of the following statements regarding post-fertilization development in flowering plants is incorrect?

Ovules develop into an embryo sac
Ovary develops into fruit
Zygote develops into an embryo
Central cell develops into endosperm

Q25. During glycolysis, ATP is directly synthesised in which step?

Conversion of glucose to glucose-6-phosphate
Conversion of fructose-6-phosphate to fructose-1,6-bisphosphate
Conversion of glucose to fructose-6-phosphate
Conversion of BPGA to 3-phosphoglyceric acid (PGA)

Q26. Why do ecosystems require a constant supply of energy?

To support the cycling of matter through biotic and abiotic components.
To counteract the tendency toward increasing disorder, in line with the Second Law of Thermodynamics.
To ensure continuous reproduction of species within the ecosystem.
To stabilize the populations of consumers at each trophic level.