General Science - MCQ Practice Questions

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?

Which statement about stomata is INCORRECT?

In the light-dependent reactions, where exactly does the photolysis of water occur?

Which of the following is a C4 plant commonly found in tropical regions?

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?

The ratio of ATP to NADPH consumed in the Calvin cycle is:

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

The Casparian strip in the endodermis of roots is primarily composed of:

Which organelle is responsible for the synthesis of ribosomal RNA in plant cells?

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

In photosynthesis, the Z-scheme diagram shows the flow of electrons between which two photosystems?

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

The transpiration coefficient (amount of water transpired per unit dry matter produced) is lowest in:

Which structure in plant cells is analogous to the centrosome in animal cells?

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

Which of the following statements about plasmolysis is TRUE?