Question

During the night, a person should not sleep under a tree because the tree,
(a) Releases oxygen during the night.
(b) Does not release carbon dioxide during the night.
(c) Releases carbon dioxide during Night.
(d) Releases water during Guttation.

Answer 1

Hint: It is a process of conversion of light energy into chemical energy that helps in the preparation of food in plants to give them nutrition and fulfill their mineral requirements.

Complete Step by Step Answer:
Photosynthesis does not take place in plants during night time as the sunlight is absent and the accumulation of carbon dioxide is more. We feel suffocated if we sleep under trees during night times when more carbon dioxide is present around the trees.
- During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy- rich organic compounds. In most cases, oxygen is also released as a waste product.
- Most plants, most algae, and cyanobacteria perform photosynthesis; such organisms are called photoautotrophs.
- Photosynthesis is largely responsible for producing and maintaining the oxygen content of the Earth’s atmosphere and supplies most of the energy necessary for life on earth.
- The process of photosynthesis always begins when energy from light is absorbed by proteins called reaction centers that contain green- colored pigment chlorophyll.
- In plants, these proteins are present inside organelles called a chloroplast.
- In these light- dependent reactions, some energy is used to strip electrons from water, producing oxygen gas.
- The three main stages of photosynthesis are:
a) Harvesting Radiant Energy: the plant absorbs light with the help of chloroplast.
b) Converting Radiant Energy: the plant converts light energy into a usable form of chemical energy to fuel the plant’s cells.
c) Storing Radiant Energy: plants use carbon dioxide and water from the soil to convert ATP and NADPH, resulting in the production of sugar, fatty acids, and glycerol.
So, the correct answer is, ‘(c) Releases carbon dioxide during Night.’

Note: The term photosynthesis originated from a Greek word phos meaning light and synthesis meaning putting together. The first photosynthetic organisms probably evolved early in the evolutionary history of life and most likely used reducing agents such as hydrogen or hydrogen sulfide, rather than water, as sources of electrons. Photosynthetic organisms also convert around 100- 115 billion tons of carbon into biomass per year.