Question

Which of the following is least effective in photosynthesis
a. Sunlight
b. Red light
c. Blue light
d. Green light

Answer 1

Hint: Photosynthesis is the process of preparing the food in presence of sunlight, water by the plants, as the plants prepare the food by their own, so they are called as photoautotrophs or primary producers of the ecosystem.

Complete answer:
- Plants use the process called photosynthesis, in order to make food.
- During photosynthesis, plants trap the light from the sun and utilize the energy of the light.
- Where this trapped light energy is used to convert the water and carbon dioxide into glucose, which is used by the plants as their food.
- Where some energy is used to produce other substances such as cellulose and starch.
- Where cellulose is mainly useful for the building the cell wall and for it’s mechanical strength.
- Where starch is stored in the seeds for future use.
- The plant leaves contain the pigment called chlorophyll, which is present in all the majority of the plants.
- As we know that chlorophyll is green color pigment, where all the colors of light are not absorbed by the chlorophyll, it only absorbs the red and blue light, while the remaining green light is reflected, because of this green light reflection, leaves appear green in color.
- Whereas in some plants, the leaves may not be able to produce chlorophyll, so in these plants green color is not reflected and they appear in some other color.

Hence, the correct answer is option (D).

Note: Respiration in plants occurs all day and night, while photosynthesis occurs in the day time only, where in photosynthesis it utilizes carbon dioxide to produce glucose, and releases oxygen as a by-product. Where in respiration it is reverse, any way the total oxygen released by plants is more.