Introduction to Photosynthesis MCQ - Practice Questions with Answers

• Green plants are the producers of the ecosystem.
• This is so because they can synthesize organic food through the usage of inorganic ingredients.
• The organic food is glucose and it is synthesized by using carbon dioxide, water, sunlight, and chlorophyll.
• There is an involvement of mineral ions that have been covered in the previous topic.
• Hence, photosynthesis is a Physico-chemical process by which plants use light energy to drive the synthesis of organic compounds.
• The use of energy from sunlight by plants during photosynthesis is the basis of life on earth. 
• Photosynthesis is important due to three reasons:
  • It is the primary source of all food on earth. 
  • It is responsible for the release of oxygen into the atmosphere by green plants.
  • The light energy is converted into chemical energy that can be stored and transported in plants.

Requirements:

• A healthy plant
• Carbon dioxide from the atmosphere
• Water from the soil
• Light, usually solar radiation from the sun

Products:

• Sugars and starches (carbohydrates)
• Water
• Oxygen 

Reaction:

• Photosynthesis is a redox reaction. Water is oxidised and carbon dioxide is reduced.

• It is an anabolic, endothermic and reductive process.