Consider statements about ecology: 1. Primary productivity is the rate of biomass production by producers. 2. Secondary productivity is the rate of new biomass creation by consumers. 3. Decomposition rate is independent of temperature. Which are correct? MCQ with Answer and Explanation

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Consider statements about ecology: 1. Primary productivity is the rate of biomass production by producers. 2. Secondary productivity is the rate of new biomass creation by consumers. 3. Decomposition rate is independent of temperature. Which are correct?

A. 1, 2 and 3

B. 2 and 3 only

C. 1 and 3 only

D. 1 and 2 only

Answer: Option D

Solution (By JKSSB Mock Tests)

Primary productivity is the rate at which autotrophs (producers) convert solar energy into chemical energy (biomass) through photosynthesis. Secondary productivity is the rate at which heterotrophs (consumers) assimilate food to create new organic matter (biomass). Decomposition is a biological process carried out by microbes, and its rate is highly dependent on environmental factors like temperature, moisture, and oxygen availability; warmer temperatures generally increase decomposition. Thus, statements 1 and 2 are correct.

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Question #1

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Gel electrophoresis is a technique used to separate:

A. DNA fragments based on size

B. Proteins based on charge only

C. Lipids based on solubility

D. Cells based on density

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Correct Answer: Option A

Explanation:
Gel electrophoresis is a widely used technique to separate charged molecules, primarily DNA, RNA, or proteins, in an electric field through a gel matrix (usually agarose for DNA). DNA fragments are separated based on their size (length in base pairs). Smaller fragments move faster and further through the gel than larger ones. The separated DNA bands are visualized using ethidium bromide and UV light.

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Question #2

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The forelimbs of humans, whales, bats, and cats are examples of:

A. Homologous organs

B. Analogous organs

C. Vestigial organs

D. Connecting links

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Correct Answer: Option A

Explanation:
Homologous organs are structures that have a similar fundamental anatomical plan and evolutionary origin but may perform different functions. The forelimbs of humans (for grasping), whales (for swimming), bats (for flying), and cats (for running) all have the same basic bone structure (humerus, radius, ulna, carpals, metacarpals, phalanges), indicating divergent evolution from a common ancestor.

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Question #3

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Assertion (A): Mitochondria and chloroplasts are considered semi-autonomous organelles. Reason (R): They possess their own DNA and ribosomes, and can synthesize some of their own proteins.

A. A is false, but R is true.

B. A is true, but R is false.

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

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

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Correct Answer: Option D

Explanation:
Mitochondria and chloroplasts contain circular DNA and 70S ribosomes, enabling them to transcribe and translate some proteins independently, though they rely on nuclear genes for most proteins. This partial autonomy supports the endosymbiotic origin hypothesis. The presence of their own genetic material and protein synthesis machinery qualifies them as semi-autonomous. Thus, both assertion and reason are correct, and the reason correctly explains the assertion.

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