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 used by green plants for the manufacture of sugar?

  1. Sun light

  2. Water

  3. Carbon dioxide

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plants need energy to grow, to replace worn out cells, to get rid of waste, and to reproduce. All organisms get energy from food. Photosynthesis is the process by which plants make food. Only plants can make food. In this process carbon dioxide and water combine in the presence of light to form sugar, a food. 

Multiple choice

Effect of light on photocells produces

  1. energy

  2. photosynthesis

  3. current

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Photocell is a device in which the photoelectric effect is used to produce a current or voltage when exposed to light or other electromagnetic radiation. 

Multiple choice

Which was first photosynthetic organism?

  1. Green algae

  2. Red algae

  3. Cyanobacteria

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cyanobacteria (blue-green algae) were first photosynthetic organisms. They contain photosynthetic lamellae equivalent to thylakoids hence, these are autotrophic.

Multiple choice

Consider the following statements regarding the major pigments and stored food in the different groups of algae and select the correct options given.I. In Chlorophyceae, the stored food material is starch and the major pigments are chlorophyll-a and d.II. In Phaeophyceae, laminarian is the stored food and major pigments are chlorophyll-a and b.III. In Rhodophyceae, floridean starch is the stored food and major pigments are chlorophyll-a, d and phycoerythrin.

  1. I is correct, but II and III are incorrect

  2. I and II are correct, but III is incorrect

  3. I and III are correct, but II is incorrect

  4. III is correct, but I and II are incorrect
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

.

Multiple choice

Match the following:

 
a. Chloroplasts 1. They are the colourless plastids of varied shapes and sizes with stored nutrients.
b. Chromoplasts 2. They contain fat soluble carotenoid pigments that give the plant a yellow, orange or red colour.
c. Leucoplasts 3. They contain chlorophyll and carotenoid pigments that are responsible for trapping light energy.

  1. a - 1, b - 2, c - 3

  2. a - 1, b - 3, c - 2

  3. a - 2, b - 3, c - 1

  4. a - 3, b - 1, c - 2

  5. a - 3, b - 2, c - 1
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option. Chloroplasts contain chlorophyll and carotenoid pigments that are responsible for trapping light energy. Chromoplasts contain fat soluble carotenoid pigments that give the plant a yellow, orange or red colour. Leucoplasts are the colourless plastids of varied shapes and sizes with stored nutrients.

Multiple choice

Photosynthesis is maximum in

  1. green light

  2. blue followed by red light

  3. red followed by blue light

  4. blue light

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

Maximum amount of photosynthesis occurs in red light, followed by blue light