Assertion (A): Responsive pollen in culture always develops directly into a globular embryo. 

Reason (R): The developmental fate (embryo vs. callus) depends on the plant species.

Select the correct option from:

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Q. Why is detecting homology difficult in the twilight zone?

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Q. Protoxylem lacuna is found in:

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Q. Assertion (A): Sequences showing more than 40% identity are usually considered homologous.

Reason (R): High sequence identity strongly reduces the likelihood of similarity arising by chance.

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Q. For which type of sequence are "similarity" and "identity" generally considered synonymous? 

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Q. In a protein alignment, if Valine (V) is aligned with Isoleucine (I), this would contribute to: 

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Q. Which of the following is a QUANTITATIVE measure?