BIOLOGY - Plant Biology - Rate of Photosynthesis

The video discusses photosynthesis and its limiting factors: light intensity, carbon dioxide concentration, and temperature. It explains how these factors affect the rate of photosynthesis and how plants adapt to different conditions. The video also highlights additional factors like chlorophyll concentration, water, and pollution. It emphasizes the application of this knowledge in greenhouses to enhance crop yields by controlling light, CO2, and temperature. The video concludes by reiterating the importance of these factors in maximizing photosynthesis rates.

Which of the following is NOT a main limiting factor affecting the rate of photosynthesis?

• Carbon dioxide concentration

• Soil type

• Light intensity

• Temperature

What happens to the rate of photosynthesis when light intensity increases?

• It remains constant

• It increases until a maximum rate is reached

• It increases indefinitely

• It decreases continuously

Why can't photosynthesis occur at maximum rate if carbon dioxide is insufficient?

• Because carbon dioxide is not needed for photosynthesis

• Because carbon dioxide cools the plant

• Because carbon dioxide blocks sunlight

• Because carbon dioxide is a limiting factor

What happens to the enzymes involved in photosynthesis at temperatures above 40 degrees Celsius?

• They remain unchanged

• They multiply

• They denature

• They become more active

How can farmers increase crop growth in greenhouses using knowledge of limiting factors?

• By reducing light intensity

• By increasing carbon dioxide concentration

• By limiting water supply

• By decreasing temperature