Our present day view regarding photosynthesis is thata)Converts light energy into chemical energyb)Creates useful energyc)Fixes CO2 into carbohydratesd)Reverses the action of respirationCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

Photosynthesis is the process by which organisms that contain the pigment chlorophyll convert light energy into chemical energy which can be stored in the molecular bonds of organic molecules (e.g., sugars). During the process of photosynthesis, light penetrates the cell and passes into the chloroplast. The light energy is intercepted by chlorophyll molecules on the granal stacks. Some of the light energy is converted to chemical energy. During this process, a phosphate is added to a molecule to cause the formation of ATP. The third phosphate chemical bond contains the new chemical energy. The ATP then provides energy to some of the other photosynthetic reactions that are causing the conversion of CO₂ into sugars.

Answer

Answer is a because in process of photosynthesis glucose is transformed into CO2 and H2O in presence on light and chlorophyl and forms energy in form of ATP so forms chemical energy. This reaction consumes energy given by light.

Answer

Photosynthesis: Converting Light Energy into Chemical Energy
Photosynthesis is the process by which plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of glucose. This process is vital for sustaining life on Earth as it is the primary source of oxygen and organic compounds necessary for the survival of most organisms.

Process of Photosynthesis
Photosynthesis occurs in the chloroplasts of plant cells, specifically in the thylakoid membranes. It involves two main stages: the light-dependent reactions and the light-independent reactions (also known as the Calvin cycle).

1. Light-Dependent Reactions:
- Light energy is absorbed by pigments, primarily chlorophyll, in the chloroplasts.
- This energy is used to split water molecules into oxygen, hydrogen ions (H+), and electrons.
- The electrons released from water are captured by electron carriers, such as NADP+, and transported to the next stage.
- The energy released during this process is used to generate ATP (adenosine triphosphate), a molecule that stores energy.

2. Light-Independent Reactions (Calvin Cycle):
- The ATP and hydrogen ions produced in the light-dependent reactions are utilized in the Calvin cycle.
- Carbon dioxide (CO2) from the atmosphere enters the cycle and combines with a five-carbon molecule called ribulose bisphosphate (RuBP).
- The resulting six-carbon compound is unstable and immediately breaks down into two molecules of three-carbon compound called 3-phosphoglycerate (PGA).
- PGA is then converted into glyceraldehyde 3-phosphate (G3P) with the help of ATP and NADPH (which was formed from NADP+ in the light-dependent reactions).
- Some G3P molecules are used to regenerate RuBP, while others are used to produce glucose and other organic compounds.

Conversion of Light Energy into Chemical Energy
The primary function of photosynthesis is to convert light energy into chemical energy in the form of glucose. This chemical energy can be stored in the plant's cells and used for various metabolic processes, such as growth, reproduction, and cellular respiration.

During photosynthesis, light energy is captured by chlorophyll and other pigments in the chloroplasts. This energy is then used to drive the synthesis of ATP, which acts as a carrier of chemical energy. The ATP, along with the reducing power generated from the light-dependent reactions, is utilized in the Calvin cycle to fix carbon dioxide and produce glucose.

In summary, the present-day view of photosynthesis is that it converts light energy into chemical energy, which is stored in the form of glucose. This process is crucial for the maintenance of life on Earth and plays a vital role in the carbon cycle and the production of oxygen.

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