NEET Botany - MCQ Practice Questions

The ascent of sap in tall trees is best explained by:

Which of the following is a characteristic of phloem transport?

The ratio of photosynthesis to respiration in a plant is represented by:

Which enzyme catalyzes the fixation of CO2 in the Calvin cycle?

The process of photorespiration in C3 plants is initiated when:

The Km value of an enzyme indicates:

During the Z-scheme of photosynthesis, electrons move from PSII to PSI. What happens to electrons after they leave PSI?

In the electron transport chain of photosynthesis, the role of cytochrome b6f complex is to:

Which of the following C3 plants can show characteristics similar to CAM plants under water stress?

A researcher observes that a plant's net photosynthesis decreases with increase in temperature above 35°C. This is primarily because:

In the Hatch and Slack pathway, malic acid is synthesized in the mesophyll cells and transported to bundle sheath cells. This adaptation is particularly advantageous because it:

A plant exhibits high transpiration rate during midday despite adequate soil moisture. Which mechanism BEST explains stomatal opening under these conditions?

Which of the following correctly represents the sequence of electron carriers in the electron transport chain of photosynthesis (from PSII)?

The apparent photosynthesis is ALWAYS greater than true photosynthesis because:

The proton gradient across thylakoid membrane in photosynthesis is maintained primarily by:

The rate-limiting step of photosynthesis under normal conditions is:

Which of the following best describes the Pasteur effect?

Which statement about ATP synthase is correct?

A plant is kept in a chamber with elevated CO2 concentration (800 ppm) and saturating light. What will be the most likely effect on the RuBP level in the stroma?

In the absence of light, what happens to the pH gradient across the thylakoid membrane?