Consider statements about evolution: 1. Natural selection was proposed by Darwin. 2. Mutation theory was proposed by de Vries. 3. Use and disuse theory was proposed by Lamarck. Which are correct? MCQ with Answer and Explanation

Consider statements about evolution: 1. Natural selection was proposed by Darwin. 2. Mutation theory was proposed by de Vries. 3. Use and disuse theory was proposed by Lamarck. Which are correct?
A. 2 and 3 only
B. 1, 2 and 3
C. 1 and 2 only
D. 1 and 3 only
Answer: Option B
Solution (By JKExamLibrary)
Charles Darwin proposed the theory of evolution by natural selection, emphasizing that organisms with favorable variations are more likely to survive and reproduce. Hugo de Vries, a Dutch botanist, proposed the mutation theory of evolution based on his work on evening primrose, stating that evolution occurs through sudden, large mutations (saltations). Jean-Baptiste Lamarck proposed the theory of inheritance of acquired characters, based on the use and disuse of organs (e.g., giraffe's neck). All statements are correct.

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Question #1
The meristematic tissue responsible for the increase in the length of the plant is:
A. Intercalary meristem
B. Lateral meristem
C. Both B and C
D. Apical meristem

Correct Answer: Option C


Explanation:
Apical meristems at root and shoot tips contribute to primary growth (increase in length). Intercalary meristems, located at nodes and leaf bases, also aid in elongation, especially in grasses. Lateral meristems (vascular cambium, cork cambium) cause secondary growth (increase in girth). So both apical and intercalary meristems are responsible for length increase.

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Question #2
The enzyme used to join DNA fragments in genetic engineering is:
A. DNA polymerase
B. DNA ligase
C. Helicase
D. Restriction enzyme

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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The micronutrient required for the synthesis of the plant hormone auxin is:
A. Manganese
B. Iron
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Correct Answer: Option D


Explanation:
Zinc is an essential micronutrient for plants, involved in the synthesis of the auxin indole-3-acetic acid (IAA) via the activation of tryptophan synthetase. Zinc deficiency causes 'little leaf' and 'rosette' diseases, stunted growth, and reduced internodes. Iron is needed for chlorophyll synthesis, manganese for photosynthesis, and boron for pollen germination.

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