Which of the following is a hydrophobic protein complex involved in photosynthesis?

The correct answer is B: Photosystem I (PSI) in thylakoid membrane. Photosystem I is an integral membrane protein complex with multiple transmembrane domains, making it hydrophobic. Rubisco is soluble, while ferredoxin and plastocyanin are soluble electron carriers. This biochemical distinction is important for understanding photosynthetic mechanisms.

The phenomenon of senescence in plants is primarily controlled by which hormone?

The correct answer is D: Ethylene. Ethylene is the major hormone controlling senescence (aging) in plants, promoting leaf yellowing, fruit ripening, and abscission.

What is the SI unit of magnetic flux?

The correct answer is B: Weber. The Weber (Wb) is the SI unit of magnetic flux, defined as Tesla × meter². 1 Wb = 1 T·m².

Which of the following is the primary pigment responsible for absorbing light energy in the visible spectrum during photosynthesis?

The correct answer is A: Chlorophyll a. Chlorophyll a is the primary photosynthetic pigment that absorbs light in the blue and red regions of the electromagnetic spectrum.

A spring with spring constant k = 100 N/m is compressed by 0.1 m. What is the elastic potential energy stored?

The correct answer is A: 0.5 J. Elastic PE = ½kx² = ½ × 100 × (0.1)² = ½ × 100 × 0.01 = 0.5 J.

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State Exam — General Science — Biology

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Showing 1–2 of 2 questions in Biology

Q.1 Easy Biology

DNA stands for?

ADeoxyribose Nucleic Acid

BDeoxyribonucleic Acid

CDouble Nucleic Acid

DDeoxyribonicotinic Acid

Correct Answer: B. Deoxyribonucleic Acid

Explanation:

DNA = Deoxyribonucleic Acid.

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Q.2 Easy Biology

Powerhouse of cell?

ANucleus

BRibosome

CMitochondria

DLysosome

Correct Answer: C. Mitochondria

Explanation:

Mitochondria produces ATP.

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