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.

The process by which plants prepare their food using sunlight is known as:

The correct answer is B: Photosynthesis. Photosynthesis is the process where plants use sunlight, water, and CO₂ to produce glucose and oxygen. The equation is 6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂.

The phenomenon of etiolation in plants is characterized by:

The correct answer is B: Elongated internodes, pale color, and reduced photosynthetic capacity. Etiolation is the adaptation to grow in darkness: shoots elongate, leaves remain pale (no chlorophyll), and seedlings appear yellowish.

Which of the following is a C4 plant commonly cultivated in India for fodder and grain production?

The correct answer is B: Maize (Corn). Maize is a C4 plant with higher photosynthetic efficiency and drought tolerance compared to C3 crops like wheat and rice.

The osmotic potential of a solution is directly related to:

The correct answer is B: Solute concentration and temperature. Osmotic potential (Ψs) = -iCRT, where it depends on solute concentration (C) and absolute temperature (T).

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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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