Photosynthesis & Plant MCQs with Answers

Three essential elements needed for the healthy growth of plants are _?

• A.Phosphorus (P), Potassium (K), and Nitrogen (N)
• B.Calcium (Ca), Magnesium (Mg), and Sulphur (S)
• C.Iron (Fe), Zinc (Zn), and Copper (Cu)
• D.Carbon (C), Hydrogen (H), and Oxygen (O)

Which isotope is used to investigate carbon uptake and biochemical pathways in plants?

• A.Carbon-12
• B.Carbon-13
• C.Carbon-14
• D.Carbon-11

The organisms which prepare their own food material from simple substances are called _?

• A.Heterotrophic
• B.Autotrophic
• C.Parasitic
• D.Saprophytic

Past Paper MCQ

The original source of energy for biomass is _?

• A.Sun
• B.Wind
• C.Water
• D.Geothermal heat

Photosystem I is located predominantly in the _?

• A.Stacked regions of the thylakoid membrane
• B.Unstacked regions of the thylakoid membrane
• C.Stroma of the chloroplast
• D.Inner membrane of the chloroplast

Which one of the following is a nitrogen fixing enzyme?

• A.Nitrogenase
• B.Amylase
• C.Pepsin
• D.Catalase

Which of the following is the correct outline of the main events in photosynthesis?

• A.Hydrogen from water combines with oxygen to form glucose in the dark.
• B.Oxygen combines with an acceptor compound and is reduced by hydrogen released from glucose.
• C.Water is split by carbon dioxide, releasing oxygen and forming glucose directly.
• D.Carbon dioxide combines with acceptor compound and this is reduced by hydrogen split from water by light.

Which gas is transported out of the leaf into the air?

• A.Carbon dioxide (CO₂)
• B.Oxygen (O₂)
• C.Nitrogen (N₂)
• D.Water vapor (H₂O)

Light dependent reaction takes place in ?

• A.Thylakoid
• B.Stroma
• C.Cristae
• D.Matrix

What gas do plants exhale at night?

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