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Bioenergetics
6 Class 9 Biology questions with answers and explanations.
Printable worksheet with answer key
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Plants make their food by:
- 1 Excretion
- 2 Photosynthesis
- 3 Respiration
- 4 Digestion
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Correct answer: Photosynthesis
Photosynthesis uses light energy to make glucose.
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Which gas do plants take in for photosynthesis?
- 1 Carbon dioxide
- 2 Oxygen
- 3 Hydrogen
- 4 Nitrogen
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Correct answer: Carbon dioxide
Carbon dioxide and water are the raw materials.
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Which pigment absorbs light in photosynthesis?
- 1 Haemoglobin
- 2 Keratin
- 3 Chlorophyll
- 4 Melanin
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Correct answer: Chlorophyll
Chlorophyll absorbs light energy, mainly red and blue light.
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The energy currency of the cell is:
- 1 RNA
- 2 Glucose
- 3 DNA
- 4 ATP
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Aerobic respiration needs:
- 1 Only light
- 2 Only nitrogen
- 3 No oxygen
- 4 Oxygen
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Correct answer: Oxygen
Aerobic respiration uses oxygen to break down glucose.
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Anaerobic respiration in yeast produces:
- 1 Oxygen
- 2 Water only
- 3 Lactic acid
- 4 Ethanol and carbon dioxide
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Correct answer: Ethanol and carbon dioxide
Yeast ferments glucose to ethanol and carbon dioxide.