Thursday 03/09/23

Chemosynthesis is a cellular process used by organisms in the deep sea ecosystem in the absence of light. A chemical equation for chemosynthesis is shown in the image.

How is chemosynthesis different from photosynthesis?

• Chemosynthesis requires carbon dioxide

• Chemosynthesis produces energy in the form of sugars

• Chemosynthesis is used by autotrophic organisms

• Chemosynthesis harvest energy from other chemical compounds.

Students investigate how light intensity affects the rate of photosynthesis in aquatic plants. The students place a light at different distances from the plant and record the number of bubbles produced.

There set-up and data are shown in the picture.

What inference is supported by the data?

• The plant produces more oxygen as light intensity increases.

• The plant requires more energy for photosynthesis at lower light intensities.

• The plant takes in more water when the light intensity decreases.

• The plant needs less carbon dioxide for photosynthesis at higher light intensities.

Tags

NGSS.HS-LS1-5

Students investigate how light intensity affects the rate of photosynthesis in aquatic plants. The students place a light at different distances from the plant and record the number of bubbles produced.

There set-up and data are shown in the picture.

Which graph shows the relationship between the rate of photosynthesis and distance from the light?

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Tags

NGSS.HS-LS1-5

How is chemosynthesis different from photosynthesis?

• Chemosynthesis does not require enzymes.

• Chemosynthesis does not require reactants from outside the cell.

• Chemosynthesis can occur in environments without sunlight.

• Chemosynthesis produces sugars that organisms use as an energy source.

Oxygen in Earth's early atmosphere was generated by marine organisms such as cyanobacteria which are sometimes called blue-green algae.

By what process did cyanobacteria oxygenate the atmosphere?

• fermentation

• photosynthesis

• protein synthesis

• cellular respiration

• chemosynthesis

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5