BioInteractive Regulation and Efficiency of Photosynthesis

Question 1

What is the light compensation point in photosynthesis?

Accepted Answer

The light intensity at which photosynthesis exactly equals cellular respiration

Answer

The point at which a plant needs the most water

Answer

The maximum light a plant can absorb

Answer

The intensity at which chlorophyll is produced

Question 2

How does temperature affect the rate of photosynthesis?

Accepted Answer

It affects enzyme activity; rates increase with temperature up to an optimum, then fall sharply

Answer

Temperature has no effect on photosynthesis

Answer

Higher temperatures always increase photosynthesis

Answer

Low temperatures increase photosynthesis indefinitely

Question 3

Which environmental factor is a limiting factor for photosynthesis at low concentrations despite abundant light?

Accepted Answer

Carbon dioxide

Answer

Oxygen

Answer

Nitrogen

Answer

Potassium

Question 4

What is the concept of limiting factors in photosynthesis?

Accepted Answer

The factor in shortest supply relative to the plant's needs that controls the overall rate of photosynthesis

Answer

The maximum CO2 a leaf can absorb

Answer

The enzyme that limits electron transport

Answer

The minimum ATP needed for carbon fixation

Question 5

How do stomata regulate photosynthesis?

Accepted Answer

By controlling CO2 entry and water vapor exit, balancing gas exchange with water conservation

Answer

By absorbing light energy

Answer

By producing chlorophyll on demand

Answer

By storing glucose produced in the Calvin cycle

Question 6

What triggers guard cells to open stomata during daylight?

Accepted Answer

Light-driven K+ influx and the accumulation of osmolytes that increase guard cell turgor

Answer

Dark conditions causing K+ efflux

Answer

High CO2 concentrations inside the leaf

Answer

Drop in leaf temperature