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 statements regarding chloroplasts is false?

  1. They occur in the cells of green photosynthetic parts of plants.

  2. Their inner membrane forms flattened sacs called thylakoids.

  3. They trap solar energy and convert it into chemical energy.

  4. They consume O2 and liberate CO2.

  5. They synthesise food by photosynthesis.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is a wrong statement. 

Multiple choice

During the early development of a vascular plant, i.e., before starting the process of photosynthesis the essential nutrients are provided by ____________.

  1. locules

  2. Strobilus

  3. Calyptra

  4. Integuments

  5. Cotyledons
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Two large green hemispherical structures which enclose the embryonic axis is called as the cotyledons. The cotyledons may be one or two in number depending on the type of plant. The cotyledons are important because it give nutrients during the early development of the plant before starting the process of photosynthesis.

Multiple choice

Which of the following statements is correct?

  1. Plants use chemical substances like carbon dioxide and nitrogen derived from the atmosphere, for the synthesis of food.

  2. Using carbon dioxide as a source of energy, plants convert simple substances into complex food.

  3. Complex chemical substances such as chlorophyll and proteins are the products of photosynthesis.

  4. Solar energy is stored in the form of food in the leaves with the help of stomata.

  5. The presence of starch in leaves indicates the occurrence of photosynthesis.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The presence of starch in leaves indicates the occurrence of photosynthesis. This statement is correct.

Multiple choice

Photosynthesis requires several raw materials. Match the location with the raw material:

a. Plant 1. Carbon dioxide
b. Soil 2. Sunlight
c. Air 3. Chlorophyll
d. Day 4. Nitrogen

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

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

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

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

  5. a - 1, b - 2, c - 4, d - 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is correct. Plants have chlorophyll. Soil contains the nitrogen that helps during photosynthesis. Air has carbon dioxide. Sunlight required by the plants during photosynthesis is availaible during day.

Multiple choice

Which of the following is a coloured plastid?

  1. Chromoplast

  2. Elaioplast

  3. Amyloplast

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

Chromoplasts are coloured plastids. Their colour is green, orange, yellow, etc. due to the presence of carotenoids.

Multiple choice

What are chromoplasts?

  1. These are plastids which are red, yellow or orange in colour.

  2. These are colourless plastids

  3. These are green coloured plastids.

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

 Yes, it is correct. This is a type of plastid which have yellow, orange or red colour. It is found in petals of flower, fruits, etc. This colour is due to two pigments, carotene and xanthophyll.

Multiple choice

Which statement doesn't describe chloroplast?

  1. It is disc shaped.

  2. Chloroplast is the site for photosynthesis.

  3. It has watery fluid rich in protein known as stroma.

  4. It occurs in those parts of plants which are not exposed to light.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 This is the correct answer as it does not describe the chloroplast. Instead it is the leucoplast present in those parts which are not exposed to sunlight.

Multiple choice

When does nitrogen gets converted to its oxides?

  1. lightening

  2. transpiration

  3. decomposition

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

The enormous energy of lightning breaks nitrogen molecules and enables their atoms to combine with oxygen in the air, forming nitrogen oxides. These dissolve in rain, forming nitrates, that are carried to the earth.

Multiple choice

Which of the following gases is used in respiration and released during photosynthesis?

  1. Nitrogen

  2. Carbon dioxide

  3. Oxygen

  4. Hydrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxygen is the gas used in respiration by most organisms and released during photosynthesis by plants. This is a fundamental biological process - animals breathe in oxygen and exhale carbon dioxide, while plants do the opposite during photosynthesis. Nitrogen makes up most of the atmosphere but is not used in respiration.

Multiple choice

Which of the following processes do not use oxygen?

  1. Combustion

  2. Respiration

  3. Formation of oxides

  4. Photosynthesis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Photosynthesis does not use oxygen - in fact, it produces oxygen as a byproduct while consuming carbon dioxide. Combustion, respiration, and oxide formation all require oxygen to occur. Photosynthesis is the only process listed that is oxygen-independent and actually generates oxygen.

Multiple choice

Which of the following gases is used in photosynthesis and released during respiration?

  1. Nitrogen

  2. Carbon dioxide

  3. Oxygen

  4. Hydrogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon dioxide (CO2) is used by plants during photosynthesis to make glucose, and it is released as a byproduct of cellular respiration in living organisms. This creates a balanced cycle between plants and animals. Nitrogen, oxygen, and hydrogen are not exchanged in this specific way between these two processes.

Multiple choice

Which of the following processes convert atmospheric carbon to glucose molecules?

  1. Transpiration

  2. Fossilization

  3. Decomposition

  4. Photosynthesis

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

Photosynthesis converts atmospheric carbon dioxide (CO2) into glucose (C6H12O6) using sunlight energy, water, and chlorophyll. Transpiration is water loss, fossilization preserves organic matter, and decomposition breaks down organic material. Only photosynthesis builds glucose molecules from atmospheric carbon.