Question

What is synthesized by the plants during photosynthesis?
A. Carbon dioxide
B. Oxygen
C. Carbohydrates
D. Water

Answer 1

Hint: As we know that photosynthesis is the process by which green plants make their own food using sunlight. In this process light energy is converted into chemical energy which is converted into fuel to perform life activities of living organisms. In this process, by using light energy carbon dioxide and water are converted into glucose.

Complete answer:
Photosynthesis process uses light energy and converts carbon dioxide and water into glucose and produces oxygen as a by-product. In this process plants synthesize their food in the form of carbohydrates.
Photosynthesis process occurs in two ways: 1. Light dependent or Light reaction and 2. Light independent or Dark reaction. It occurs in a step by step manner and also maintains oxygen and carbon dioxide content in the atmosphere.
Light dependent reaction: It occurs in the thylakoid membrane and needs light energy which is utilized by chlorophyll and produces ATP and NADPH and water molecules are converted into oxygen in this process.
Light independent reaction: It occurs in the stroma and it can take place in dark or in absence of light, it utilizes ATP and NADPH which is produced from the light reaction to breakdown the carbon dioxide. This process helps in formation of carbon sugars i.e. glucose or fructose.
Plant leaves absorb sunlight and excite chlorophyll which activate electrons and in the very first step water is absorbed by the plant then electrons form ATP and NADPH and oxygen is released in the atmosphere through the leaves.
In the next step the energy formed from light reaction converts carbon dioxide into glucose.

Hence, the correct answer is option (C) i.e. Carbohydrates.

Note: There are two types of photosynthesis reactions from which light reaction needs constant sunlight and dark reaction occurs in absence of the light. Light reaction takes place in the thylakoid membrane and dark reaction takes place in the stroma. During photosynthesis reaction, Six molecules of carbon dioxide and six molecules of water utilize light energy and produce one molecule of glucose and six molecules of oxygen.