The structure that is the site of fertilization in flowering plants is the: MCQ with Answer and Explanation

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The structure that is the site of fertilization in flowering plants is the:

A. Ovule

B. Ovary

C. Style

D. Stigma

Answer: Option A

Solution (By JKExamLibrary)

Fertilization occurs within the ovule, where the pollen tube delivers two sperm cells. One fuses with the egg to form the zygote, the other with polar nuclei to form endosperm. The stigma receives pollen, style is the path, ovary contains ovules.

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Question #1

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Consider the following statements about the nervous system:
1. Motor neurons carry impulses from the CNS to effectors.
2. Sensory neurons carry impulses from receptors to the CNS.
3. Interneurons are found only in the peripheral nervous system.
Which of the above is/are correct?

A. 1 and 3 only

B. 1 and 2 only

C. 2 and 3 only

D. 1, 2, and 3

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Correct Answer: Option B

Explanation:
Motor (efferent) and sensory (afferent) neurons are correctly described. Interneurons are found in the CNS, not PNS. So 3 is incorrect.

This question belongs to: Science Biology

Question #2

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The restriction enzyme EcoRI recognizes the palindromic DNA sequence 5'-GAATTC-3' and cuts the DNA between the:

A. T and C

B. G and A

C. C and G

D. A and T

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Correct Answer: Option B

Explanation:
Restriction enzymes are molecular scissors that cut DNA at specific recognition sites. EcoRI, isolated from Escherichia coli strain RY13, recognizes the 6-base pair palindromic sequence 5'-GAATTC-3'. It cuts the phosphodiester bond between the G and the A on both strands, leaving single-stranded overhangs called 'sticky ends' (5'-AATT-3'). These sticky ends are crucial for joining DNA fragments from different sources using DNA ligase.

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Question #3

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Consider statements about vitamins: 1. Vitamin A deficiency causes night blindness. 2. Vitamin B1 deficiency causes beriberi. 3. Vitamin C is essential for blood clotting. Which are correct?

A. 1, 2 and 3

B. 1 and 2 only

C. 2 and 3 only

D. 1 and 3 only

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Correct Answer: Option B

Explanation:
Vitamin A is essential for the formation of rhodopsin in the retina; its deficiency causes night blindness. Vitamin B1 (thiamine) deficiency leads to beriberi, characterized by nerve and heart issues. Vitamin K, not Vitamin C, is essential for the synthesis of blood clotting factors like prothrombin. Vitamin C is essential for collagen synthesis and immunity. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology

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