ET Factors affecting photosynthesis 12/2/24

How does temperature affects photosynthesis rate?

• As temperature increases, photosynthesis rate also increases.
• As temperature decreases, photosynthesis rate also decreases.
• Plants cannot photosynthesis if the temperature is too cold or too hot. 
• All of the statements are true.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6

Air samples taken in Canada since 1986 show that atmospheric carbon dioxide concentration is higher on average in winter than in summer

Which of the following statements best explains the difference in carbon dioxide concentrations?

• The rate of decomposition is slower in winter than in summer.

• The greenhouse effect is more pronounced in winter than in summer

• The number of animals that are active is less in winter than in summer.

• The amount of photosynthesis by plants is lower in winter than in summer.

Tags

NGSS.MS-LS1-6

Mallory has 4 aquatic plants of the same size and species. She submerges each plant in a separate beaker filled with 200 mL of water. She then sets each beaker under a different intensity of light. Mallory observes that, of the four plants, the plant in the beaker under the most intense light gives off the most gas bubbles in a 20 min. period...

What type of gas are the plants releasing?

• carbon dioxide

• oxygen

• starch

• ammonia

Tags

NGSS.MS-LS1-6

(same experiment different question) Mallory has 4 aquatic plants of the same size and species. She submerges each plant in a separate beaker filled with 200 mL of water. She then sets each beaker under a different intensity of light. Mallory observes that, of the four plants, the plant in the beaker under the most intense light gives off the most gas bubbles in a 20 min. period...

Which of the following statements best explains Mallory's observations?

• Cells decompose most quickly under the most intense light.

• Water evaporates from plants fastest under the most intense light.

• Photosynthesis occurs at the highest rate under the most intense light.

• Gases in the leaves of plants expand most under the most intense light.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

In periods of hot, dry weather, the pores on the leaf surfaces of most plants close in order to reduce water loss during the day. When these pores are closed, plants cannot take in carbon dioxide.

As a direct result, the rate of which of the following processes decreases?

• Cellular respiration

• Mitosis

• Nitrogen fixation

• Photosynthesis

Tags

NGSS.MS-LS1-6

This chart shows the Effect of Light Intensity on the Rate of Photosynthesis in Elodea Canadensis (Canadian Waterweed)

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Based on the data, how does increasing light intensity affect the rate of photosynthesis in Elodea Canadensis?

• It has no effect on the rate of photosynthesis

•  It decreases the rate of photosynthesis

• It increases the rate of photosynthesis

• It varies depending on other factors

Tags

B-LS1-5