Biology

Photosynthesis in Plants

1,508 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 general knowledge sports

What is one of the chemical equation for photosynthesis?

  1. C6H12O6 + 6O2 = 6CO2 + 6H2O + energy

  2. C4H12O6 + O2 = 4CO2 + 6H2 + energy

  3. C6H6O6 + 3O2 = 6CO2 + 3H2 + energy

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

The equation shows the breakdown of glucose during cellular respiration, which is essentially the reverse of photosynthesis. C6H12O6 (glucose) + 6O2 produces 6CO2 + 6H2O + energy, representing the oxidative process that releases stored energy.

Multiple choice general knowledge science & technology

Photosynthesis generally takes place in which parts of the plant?

  1. Leaf and other chloroplast bearing plants

  2. steam and leaf

  3. Roots and chloroplast bearing plants

  4. Bark and leaf
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Photosynthesis occurs primarily in leaves and other chloroplast-containing parts of plants because chloroplasts contain chlorophyll, which captures light energy. Options B and C contain stems/roots which lack chloroplasts or have minimal photosynthetic capacity. Option D includes bark which does not photosynthesize.

Multiple choice

Photosynthesis in plant is an example of

  1. isolated system

  2. closed system

  3. open system

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

This system exchange both matter and energy with the surroundings. Since plant exchanges both matter and energy with the surroundings, photosynthesis is an example of open system.

Multiple choice

The accessory pigment phycobilin is a characteristic feature of

  1. chlorophyta

  2. euglenophyta

  3. phaeophyta

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

This phylum of the kingdom protista contains photosynthetic organisms commonly known as red algae. Members of this division have a peculiar clear red colour imparted by accessory pigments called phycobilins. They are multicellular and are characterized by a great deal of branching.

Multiple choice

Photosynthesis takes place in which part of the plant?

  1. Roots of the plants.

  2. Green parts of the plants.

  3. Seeds of the plants.

  4. Fruit of plant.

  5. All parts of the plants.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photosynthesis is the biochemical process in which light energy is absorbed by chlorophyll and used to build sugar from carbon dioxide and water, releasing oxygen. The process occurs  in green parts of the plant mostly leaves. In some plants stem may be modified hebaceous to perform photosynthesis.

Multiple choice

Which among the following statements does not characterise the chloroplasts of the plant cells?

  1. All chloroplasts have at least three membrane systems.

  2. Many chloroplast DNAs contain numerous inverted repeats.

  3. Cyanobacteria are considered the ancestors of chloroplasts.

  4. In land plants, chloroplasts are generally lens-shaped.

  5. The inner chloroplast membrane regulates the passage of material.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Many chloroplast DNAs contain two inverted repeats, which separate a long single copy section (LSC) from a short single copy section (SSC). While a given pair of inverted repeats is rarely completely identical, they are always very similar to each other, apparently resulting from concerted evolution.

Multiple choice

Which of the following is an olive green colored chlorophyll?

  1. Chlorophyll a

  2. Chlorophyll b

  3. Chlorophyll c

  4. Chlorophyll d

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

Chlorophyll b is an olive green pigment found only in the chloroplasts of plants, green algae, any secondary chloroplasts obtained through the secondary endosymbiosis of a green alga, and a few cyanobacteria. It is the chlorophylls a and b together that make most plant and green algal chloroplasts green.

Multiple choice

A green plant will turn yellow if placed in the dark. This is called

  1. necrosis

  2. chlorosis

  3. phototropism

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

When plants are deprived of light, they cannot produce chlorophyll, which gives them their green color. This yellowing condition due to chlorophyll deficiency is called chlorosis. Necrosis refers to tissue death, phototropism is growth toward light, and vernalization is cold treatment.

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

The first stable compound of C4 cycle is

  1. oxaloacetic acid

  2. phospho enol pyruvate

  3. ribulose 1,5-diphosphate(RuDP)

  4. fructose 1,6 diphosphate

  5. phosphoglyceric acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In C4 plants, phospho enol pyruvate combines with carbon dioxide to form first stable compound oxaloacetic acid.

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.