Consider statements about gymnosperms: 1. They bear naked seeds. 2. They are mostly evergreen trees. 3. They undergo double fertilization. Which are correct? MCQ with Answer and Explanation

Question

Consider statements about gymnosperms: 1. They bear naked seeds. 2. They are mostly evergreen trees. 3. They undergo double fertilization. Which are correct?

A. 1 and 3 only

B. 1, 2 and 3

C. 2 and 3 only

D. 1 and 2 only

Answer: Option D

Solution (By JKExamLibrary)

Gymnosperms are seed-producing plants where the ovules are not enclosed in an ovary; hence, the seeds are naked. They are predominantly perennial, evergreen, woody trees like pines and cedars. Double fertilization and the formation of triploid endosperm are unique characteristics of angiosperms, not gymnosperms. Thus, statements 1 and 2 are correct.

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The enzyme used to join DNA fragments in genetic engineering is:

A. Helicase

B. DNA ligase

C. DNA polymerase

D. Restriction enzyme

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Correct Answer: Option B

Explanation:
DNA ligase seals the phosphodiester bonds between adjacent DNA fragments, joining them together. In recombinant DNA technology, it is used to ligate the gene of interest into a vector. Restriction enzymes cut DNA, DNA polymerase synthesizes DNA, and helicase unwinds the double helix. Ligase is essential for finalizing the recombinant DNA molecule.

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Question #2

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The primary muscle of breathing is the:

A. Diaphragm

B. Intercostal muscles

C. Pectoral muscles

D. Abdominal muscles

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Correct Answer: Option A

Explanation:
The diaphragm is a dome-shaped skeletal muscle that contracts during inspiration, flattening and increasing thoracic volume. The external intercostal muscles assist.

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Question #3

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Consider the following statements about photosynthesis:
1. C3 plants fix CO₂ directly in the Calvin cycle.
2. C4 plants have Kranz anatomy.
3. Photorespiration is higher in C4 plants.
Which of the above is/are correct?

A. 1 and 2 only

B. 2 and 3 only

C. 1, 2, and 3

D. 1 and 3 only

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Correct Answer: Option A

Explanation:
C3 plants use Calvin cycle directly; C4 plants have Kranz anatomy and a CO₂-concentrating mechanism. Photorespiration is negligible in C4 plants, higher in C3. Thus, 3 is incorrect.

This question belongs to: Science Biology

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