Consider statements about evolution: 1. Fossils provide evidence of past life. 2. Homologous organs indicate common ancestry. 3. Analogous organs indicate common ancestry. Which are correct? MCQ with Answer and Explanation

Consider statements about evolution: 1. Fossils provide evidence of past life. 2. Homologous organs indicate common ancestry. 3. Analogous organs indicate common ancestry. Which are correct?
A. 1 and 3 only
B. 2 and 3 only
C. 1 and 2 only
D. 1, 2 and 3
Answer: Option C
Solution (By JKExamLibrary)
Fossils are the preserved remains or traces of ancient organisms, providing direct, chronological evidence of evolutionary changes and past life forms over millions of years. Homologous organs (like the forelimbs of humans, whales, and bats) share a common structural plan and evolutionary origin, indicating divergent evolution from a common ancestor. Analogous organs (like the wings of birds and insects) perform similar functions but have different structural plans and evolutionary origins, indicating convergent evolution, not common ancestry. Thus, statements 1 and 2 are correct.

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Question #1
Bacillus thuringiensis (Bt) is widely used as a:
A. Biopesticide (Bioinsecticide)
B. Bioherbicide
C. Biofertilizer
D. Bioremediation agent

Correct Answer: Option A


Explanation:
Bacillus thuringiensis (Bt) is widely used as a biopesticide, specifically a bioinsecticide. The spores of Bt contain crystalline proteins (Cry toxins) that are toxic to the larvae of many insects, particularly Lepidoptera (caterpillars), Diptera (flies), and Coleoptera (beetles). When sprayed on crops or ingested by transgenic plants, these toxins kill the pests without harming humans, animals, or beneficial insects.

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Question #2
Consider statements about genetics: 1. Genes are made of DNA. 2. Chromosomes are located in the nucleus. 3. RNA is the genetic material in all cells. Which are correct?
A. 2 and 3 only
B. 1, 2 and 3
C. 1 and 2 only
D. 1 and 3 only

Correct Answer: Option C


Explanation:
Genes are specific sequences of nucleotides that serve as the fundamental units of heredity, and in all cellular organisms, they are made of DNA (deoxyribonucleic acid). Chromosomes are thread-like structures composed of DNA and proteins, and they are located within the nucleus of eukaryotic cells. DNA is the genetic material in all cellular organisms; RNA serves as the genetic material only in some viruses, not in cells. Thus, statements 1 and 2 are correct.

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Question #3
Which of the following is true about blood group O?
A. Has only A antigens
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C. Has both A and B antigens
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Correct Answer: Option B


Explanation:
Blood group O lacks A and B antigens on red cells but contains both anti-A and anti-B antibodies in plasma. This makes it the universal donor for packed red cells but dangerous plasma donor. Group AB has no antibodies. So, the presence of both antibodies is correct.

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