General Science - MCQ Practice Questions

The pulling force that moves water upward in xylem vessels is primarily due to:

In the nitrogen cycle, the conversion of atmospheric N2 into ammonia is carried out by:

When a plant wilts despite adequate soil moisture, this condition is called:

The double fertilization process in angiosperms results in the formation of:

Which of the following shows the highest photosynthetic efficiency?

During photosynthesis, the lumenal pH of thylakoids drops to approximately:

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

Which of the following statements about stomatal conductance is correct?

In the electron transport chain of chloroplasts, which complex transfers electrons from water to plastoquinone?

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

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

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

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

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?