AP BIOLOGY

PLANTS

PLANT RESPONSES TO STIMULI

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Why do many plants needs a daily change of temperature?
A
so they can sleep
B
to ensure photosynthesis and respiration can occur so the plant can grow
C
to regrow chlorophyll
D
in order to produce a healthy seed
Explanation: 

Detailed explanation-1: -At low temperatures, the rate of photosynthesis is limited by the number of collisions between enzymes and substrate. As temperature increases the number of collisions increases, therefore the rate of photosynthesis increases.

Detailed explanation-2: -In particular, temperature is a critical factor affecting plant growth. Each plant species has a suitable temperature range. Within this range, higher temperatures generally promote shoot growth, including leaf expansion and stem elongation and thickening. However, temperatures above the optimal range suppress growth.

Detailed explanation-3: -Temperature has an impact on the rate of photosynthesis. The rate of photosynthesis increases as the temperature rises. During photosynthesis, a temperature of more than 40 °C slows down the process. Because it is an enzyme-controlled process, this is the case.

Detailed explanation-4: -The glucose formed during photosynthesis provides energy to the plants. The process of respiration makes effective use of energy. In this process, oxygen is given off by the plants to the surroundings. The carbon dioxide is taken up from the surroundings in used in photosynthesis.

There is 1 question to complete.