The rate of photosynthesis increases with an increase in CO2 concentration until it reaches a plateau. This plateau is called:

The correct answer is B: Saturation point. The saturation point is the CO2 concentration beyond which photosynthesis rate does not increase further, limited by other factors like temperature or light.

Which of the following statements about plasmolysis is TRUE?

The correct answer is D: Both A and B. Plasmolysis is the shrinkage of protoplasm away from the cell wall when placed in hypertonic solution. It's reversible if not prolonged.

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.

A wire of resistance R is stretched to double its length. What is the new resistance?

The correct answer is C: 4R. Resistance R = ρL/A. When length doubles, L becomes 2L and area becomes A/2 (volume constant). New R = ρ(2L)/(A/2) = 4ρL/A = 4R

In the light-dependent reactions, the splitting of water molecules produces oxygen, hydrogen ions, and:

The correct answer is C: Electrons. Water photolysis (2H2O → O2 + 4H+ + 4e-) releases electrons that are transferred through electron transport chains.

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All Physics 106 Chemistry 9 Biology 2 Botany 78 Human Body 4 Disease & Health 2 Space & Astronomy 5 Environment 1

Q.1 Easy Environment

Gas causing global warming?

A Oxygen

B Nitrogen

C Carbon Dioxide

D Hydrogen

Correct Answer: C. Carbon Dioxide

EXPLANATION

CO₂ is main greenhouse gas.

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