Biology

Photosynthesis in Plants

1,492 Questions

Photosynthesis is the biological process by which plants convert light energy into chemical energy. This page contains practice questions covering essential topics like chlorophyll, light reactions, and the pathways specific to plants. This material is crucial for medical entrance exams and academic assessments.

Chlorophyll and pigmentsLight reactionsCalvin cycleCAM plantsElectron transportPhotosynthesis factors

Photosynthesis in Plants Questions

Multiple choice

Which of the following is correct for bacteria?

  1. They have both cyclic and non-cyclic photophosphorylation.

  2. They absorb light > 900 nm of wavelength.

  3. They release oxygen during photosynthesis.

  4. They use water during photosynthesis.

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Correct Answer: They absorb light > 900 nm of wavelength.

Multiple choice

Which of the following is a wastage process?

  1. Respiration

  2. Photosynthesis

  3. Photorespiration

  4. Movement

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Photorespiration (also known as the oxidative photosynthetic carbon cycle, or C2 photosynthesis) refers to a process in plant metabolism where RuBisCO oxygenates RuBP causing some of the energy produced by photosynthesis to be wasted.

Multiple choice

During photosynthesis,

  1. oxygen evolved comes from CO2

  2. ATP is not formed

  3. ATP is formed

  4. water is required as a medium, but it does not take part in photosynthesis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Photosynthesis is a process in which green plants use energy from the sun to transform water, carbon dioxide and minerals into oxygen and organic compounds. ATP is formed here.

Multiple choice

The first step in dark reaction of photosynthesis is the

  1. formation of ATP

  2. ionisation of water

  3. attachment of carbon dioxide to pentose sugar

  4. excitement of electron of chlorophyll by a photon of light

  5. --
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ribulose Bisphosphate Carboxylase (RuBP Carboxylase) catalyses CO2 fixation. Ribulose-1,5-bisphosphate + CO2 ----------------> 2 copies of 3-phosphoglycerate

Multiple choice

In case of C4 plants, the acceptor of CO2 is

  1. phosphoglyceraldehyde

  2. ribulose monophosphate

  3. ribulose diphosphate

  4. phosphoenolpyruvate

  5. -
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Phosphoenolpyruvate carboxylase is an enzyme that is found in plants and some bacteria that catalyse the addition of bicarbonate to phosphoenolpyruvate to form four-carbon compound oxaloacetate and inorganic phosphate.

Multiple choice

Sugarcane shows high efficiency of CO2 fixation due to which of the following?

  1. Calvin cycle

  2. Hatch-Slack cycle

  3. TCA cycle

  4. Greater sunlight

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The C4 pathway was elucidated by Marshall Davidson Hatch and C. R. Slack in Australia in 1966. It is sometimes called the Hatch-Slack pathway. This pathway is a modification of Calvin cycle and is advantageous to plants that grow in dense stands of tropical vegetation, where the CO2 concentration may be very much reduced.