General Science - MCQ Practice Questions

The rate of photosynthesis increases with increasing CO2 concentration only up to a certain point. This point is called:

Which of the following is characteristic of monocot roots?

Abscisic acid (ABA) functions primarily as which type of hormone?

The green color of chloroplasts is due to which property of chlorophyll?

In woody dicots, the wood primarily consists of:

The process of nitrogen fixation in legumes is performed by which organism?

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 organelles is responsible for synthesizing ATP through oxidative phosphorylation in plant cells?

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

During C3 photosynthesis, the first stable product formed after CO₂ fixation is:

Which enzyme catalyzes the carboxylation of RuBP in the Calvin cycle, and what is its full name?

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:

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

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?