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 processes take place in desert plants?

a. They take up CO2 at night. b. They absorb sunlight in the day and prepare starch at the night. c. Intermediates are prepared at night. d. Stems carry out photosynthesis. e. They store the light energy during the day.

  1. Only a, c and e

  2. Only a and b

  3. Only b and e

  4. Only a, c and d
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

a, c and d are the processes carried out by the desert plants. They take up CO2 at night. Intermediates are prepared at night. Stems carry out photosynthesis.

Multiple choice

Which of the following statements is/are false?

  1. Entner–Doudoroff pathway occurs only in eukaryotes.
  2. Site of photosynthesis in purple bacteria is thylakoids.
  3. Bacteriochlorophyll absorbs in the range of 800-1000 nm.
  4. Non-cyclic photophosphorylation is not found in bacterial photosynthesis.

Select the correct answer using codes given below:

  1. 1 and 2

  2. 1 and 3

  3. 1 and 4

  4. 2 and 3

  5. 2 and 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Entner–Doudoroff pathway occurs only in prokaryotes. Site of photosynthesis in purple bacteria is chromatophores.

Multiple choice

Chloroplasts have their own DNA.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chloroplasts and mitochondria are semi-autonomous organelles that contain their own circular DNA and ribosomes, supporting the endosymbiotic theory.

Multiple choice

The site of photosynthesis in plants is

  1. Plastids

  2. Nucleus

  3. Mitochondria

  4. Endoplasmic Reticulum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

These are found only in plant cells and in certain protists (e.g. Euglena). There are two main types - chromoplasts and leucoplasts. The chromoplasts contain coloured pigment and occur in the cells exposed to sunlight. The leucoplasts are colourless and occur in the cells not exposed to light. The chromoplasts having light absorbing green pigment, the chlorophyll are called chloroplasts. The chloroplasts trap the radiant energy of sunlight and transform it into chemical energy of glucose using CO2 and H20. The process is called photosynthesis.

Multiple choice

The process of atmospheric N2 fixation is done by

  1. plants

  2. animals

  3. industries

  4. lightening

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lightning provides the high energy required to break the strong triple bonds of atmospheric nitrogen, allowing it to react with oxygen and form nitrogen oxides that eventually reach the soil.