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Question

In plant cells, peroxisomes are associated with


A

Phototropism

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B

Photosynthesis

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C

Photoperiodism

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D

Photorespiration

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Solution

The correct option is D

Photorespiration


The correct option is D.

Explanation of the correct option:

  1. Peroxisomes are small cell organelles, single membrane-bound vesicles found in all eukaryotic cells which include single and multicellular organisms in plants and animals.
  2. Peroxisomes comprise digestive enzymes, which break down toxic materials present within the cell, and oxidative enzymes for metabolic activity.
  3. The most important role of peroxisome is their participation in photorespiration.
  4. Peroxisome helps in the oxidation of glycolate during photorespiration.

Explanation of the incorrect option:

Option A:

  1. Phototropism is the differential cell elongation seen in plants as a response to the stimulus of light.
  2. It causes the bending of light towards the source.
  3. Plant hormone auxin is responsible for phototropism.

Option B:

  1. Photosynthesis is the process by which plants synthesize food using water and carbon dioxide in presence of sunlight.
  2. Oxygen is a byproduct of this process.
  3. It takes place in the chloroplast.

Option C:

  1. Photoperiodism is the response of plants to the length of the night or a dark period.
  2. Plants respond to duration in daily, seasonal or yearly cycles of light and darkness.
  3. The photoreceptor protein in plants senses the seasonal change in night or photoperiod.

Final answer: In plant cells, peroxisomes are associated with photorespiration.


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