Explanation:

Photorespiration is a metabolic process that occurs in plants, particularly in the chloroplasts of plant cells. It is an energy-consuming process that counteracts the efficiency of photosynthesis and occurs in the presence of light. Let's analyze each option to understand why option D is the correct answer:

a) It occurs in chloroplasts:
This statement is correct. Photorespiration primarily takes place in the chloroplasts of plant cells. Chloroplasts are responsible for photosynthesis, where light energy is converted into chemical energy. However, during photorespiration, the chloroplasts also play a role in the breakdown and recycling of organic molecules.

b) It occurs in daytime only:
This statement is incorrect. While photorespiration primarily occurs during the daytime when photosynthesis is active, it can also occur to a lesser extent during the night. This is because certain plant species, such as CAM (Crassulacean Acid Metabolism) plants, perform photosynthesis at night and close their stomata during the day to conserve water. In these plants, photorespiration can occur during the night when the stomata are closed.

c) It is characteristic of C-plants:
This statement is incorrect. Photorespiration is not specific to C-plants. C-plant refers to plants that utilize the C3 pathway for carbon fixation during photosynthesis. However, photorespiration can also occur in other types of plants, such as C4 plants and CAM plants. C4 plants have evolved a mechanism to minimize the effects of photorespiration, while CAM plants have adapted their photosynthetic processes to reduce water loss.

d) It is a characteristic of C-plants:
This statement is incorrect. As mentioned earlier, photorespiration is not limited to C-plants but can occur in various types of plants. It is a metabolic process that can occur in all types of plants, although the extent of photorespiration may vary between plant species and environmental conditions.

Therefore, option D is the correct answer as it incorrectly states that photorespiration is a characteristic of C-plants.