Photosynthesis & Plant MCQs with Answers

According to pressure flow theory, which one of the following acts both as source and sink?

• A.Leaves
• B.Roots
• C.Stem
• D.Fruits

What are the main inputs required for photosynthesis in plants?

• A.Carbon dioxide, nitrogen, sunlight
• B.Oxygen, glucose, sunlight
• C.Water, oxygen, chlorophyll
• D.Water, carbon dioxide, sunlight

Which gas is used to extract energy from food in photosynthesis?

• A.Oxygen
• B.Nitrogen
• C.Carbon Dioxide
• D.Hydrogen

Name the process in which plants convert light energy into chemical energy.

• A.Respiration
• B.Photosynthesis
• C.Transpiration
• D.Fermentation

Past Paper MCQ

It is dangerous to sleep under trees at night because plants give out _?

• A.Oxygen
• B.Carbon dioxide
• C.Nitrogen
• D.Water vapour

During photorespiration, an acid glycolate is formed which is converted into glycine by ?

• A.Mitochondria
• B.Peroxisome
• C.Chloroplast
• D.Ribosome

Product of the Calvin cycle is:

• A.Glucose
• B.RuBP (Ribulose bisphosphate)
• C.G3P (Glyceraldehyde-3-phosphate)
• D.PGA (3-phosphoglycerate)

Plants require a number of soil nutrients like nitrogen, Phosphorus, and ?

• A.Calcium
• B.Potassium
• C.Magnesium
• D.Sulphur

Plants at night exhale ?

• A.Oxygen
• B.Carbon dioxide
• C.Nitrogen
• D.Water vapour

What is the general chemical equation for photosynthesis?

• A.Water + CO2 + Sunlight = Glucose + O2
• B.Glucose + O2 + Sunlight = Water + CO2
• C.Water + O2 + Sunlight = Glucose + CO2
• D.Glucose + CO2 + Sunlight = Water + O2