Photosynthesis & Plant MCQs with Answers

Which part of sunlight is absorbed by photosynthetic organisms?

• A.Ultraviolet radiation
• B.Infrared radiation
• C.Visible spectrum
• D.X-rays

Past Paper MCQ

Photosynthesis takes place in the presence of which of the following light?

• A.In any visible light
• B.Only in artificial light
• C.Only in sunlight from the sun
• D.Only in ultraviolet light

Stream of chloroplast carriers the fixation of ?

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

Nitrogen fixing bacteria in root nodules fix nitrogen in soil air into _?

• A.Nitrates
• B.Ammonia
• C.Nitrites
• D.Nitric oxide

Which macro nutrients of animal bodies are micronutrients in plants?

• A.Na and Cl
• B.N and P
• C.Ca and Mg
• D.Fe and Zn

The products of the reaction between carbon dioxide and water are ?

• A.Carbonic acid (H₂CO₃) and Oxygen (O₂)
• B.Glucose (C₆H₁₂O₆) and Carbon monoxide (CO)
• C.Oxygen (O₂) and Hydrogen (H₂)
• D.Glucose (C₆H₁₂O₆) and Oxygen (O₂)

Carbon is an integral part of an ecosystem. It is cycled throughout the ecosystem as it is used and then reused. It is necessary for all life to exist. Name the process in which plants use carbon dioxide?

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

Photosynthesis is the chemical reaction that occurs in the leaves of plants. But it requires a special gas, an abiotic component from the atmosphere. What is this substance?

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

The source of oxygen in photosynthesis is?

• A.Carbon dioxide
• B.Glucose
• C.Water
• D.Sunlight

Which one of the following elements in plants is not remobilized?

• A.Nitrogen
• B.Phosphorus
• C.Calcium
• D.Potassium