Consider statements about plant reproduction: 1. The anther produces pollen. 2. The ovary develops into the fruit. 3. Self-pollination increases genetic diversity. Which are correct? MCQ with Answer and Explanation

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Consider statements about plant reproduction: 1. The anther produces pollen. 2. The ovary develops into the fruit. 3. Self-pollination increases genetic diversity. Which are correct?

A. 2 and 3 only

B. 1 and 3 only

C. 1 and 2 only

D. 1, 2 and 3

Answer: Option C

Solution (By JKSSB Mock Tests)

The anther is the male reproductive part of the flower where microspores develop into pollen grains. After fertilization, the ovary wall matures and develops into the fruit, enclosing the seeds. Self-pollination involves the transfer of pollen to the stigma of the same flower or plant, resulting in offspring genetically identical to the parent, thus decreasing, not increasing, genetic diversity. Thus, statements 1 and 2 are correct.

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Question #1

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The codon AUG codes for:

A. Methionine

B. Arginine

C. Glycine

D. Alanine

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Correct Answer: Option A

Explanation:
AUG is the initiation codon and codes for methionine in eukaryotes (formylmethionine in prokaryotes). It signals the start of translation. Arginine codons include CGU, CGC, etc. Alanine is coded by GCU, etc. Glycine by GGU, etc. The genetic code is degenerate, meaning multiple codons can code for the same amino acid, but AUG is unique as the initiator.

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Question #2

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Assertion (A): RNA is usually single-stranded.
Reason (R): RNA contains deoxyribose sugar.

A. A is true, but R is false.

B. Both A and R are true, and R is the correct explanation.

C. Both A and R are true, but R is not the correct explanation.

D. A is false, but R is true.

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Correct Answer: Option A

Explanation:
RNA is typically single-stranded (A true), but it contains ribose, not deoxyribose. Deoxyribose is in DNA. Thus R is false.

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Question #3

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Which of the following is an example of a living thing showing autotrophic nutrition?

A. Spirogyra

B. Rhizopus

C. Mushroom

D. Mucor

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Correct Answer: Option A

Explanation:
Spirogyra is a filamentous green alga containing chloroplasts, performing photosynthesis, hence autotrophic. Mushroom, Mucor, and Rhizopus are fungi, which are heterotrophic saprophytes or parasites. Autotrophs synthesize their own food using light or chemical energy. Spirogyra belongs to algae, classified under Plantae in five-kingdom classification. Its ribbon-shaped chloroplast aids in photosynthesis. This question tests the concept of nutrition modes.

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