General Science - MCQ Practice Questions

The calcium pump in plant cell vacuole membrane is primarily involved in:

The phenomenon where plants show reduced photosynthesis when exposed to high oxygen concentrations is called:

Mycorrhizal associations in plants primarily enhance the uptake of which nutrients?

The casparian strip in plant roots is composed primarily of:

The quantum yield of photosynthesis (φ) represents:

Guttation in plants occurs due to:

The turgor pressure in plant cells is maintained by which osmotically active substances?

The Hatch-Slack cycle in C4 plants first produces which compound?

The transpiration pull mechanism in xylem transport depends on which principle?

The non-cyclic photophosphorylation in photosystem II produces:

The reduction phase of Calvin cycle produces which molecule as the final product?

C3 plants show a phenomenon of photorespiration. What is the primary substrate that reacts with RuBP when O2 concentration is high?

The phenomenon where plants lose water as liquid droplets from leaf margins is called:

Which plant hormone is known to have antagonistic effects to gibberellins in seed germination?

Which of the following transport mechanisms does NOT require energy in plant cells?

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

Which of the following is a chemosynthetic organism commonly found in soil?

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