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

The first step in photosynthetic process is the

  1. fixation of carbon dioxide

  2. excitation of chlorophyll by sunlight

  3. release of oxygen from water

  4. formation of carbohydrate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The first step in photosynthetic process is the release of oxygen from water.

Multiple choice

Artificial light can

  1. bring about photosynthesis

  2. destroy chlorophyll

  3. not bring about photosynthesis

  4. synthesise chlorophyll

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

Artificial light can bring about photosynthesis. Mostly all spectrums of light can help a plant grow and undergo photosynthesis.

Multiple choice

Which of the following statements regarding respiration and photosynthesis in plants is correct?

  1. Photosynthesis proceeds at a much slower rate than respiration.

  2. Photosynthesis proceeds at a much faster rate than respiration.

  3. Both proceed at the same rate.

  4. There is no connection between the two.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photosynthesis proceeds at a much faster rate than respiration. Since photosynthesis proceeds at a much faster rate than respiration, the amount of carbon dioxide absorbed by photosynthesis is much more than that released by respiration under the two conditions.

Multiple choice

Which of the following statements is correct?

  1. Plants carry on photosynthesis during the night and respiration during the day.

  2. Plants carry on photosynthesis all the time.

  3. Plants carry on respiration and photosynthesis alternately all the time.

  4. Plants carry on photosynthesis during the day and respiration all the time.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plants carry on photosynthesis during the day and respiration all the time. For the process of photosynthesis, plants need time to produce food, so it is done during the day and respiration is done all time.

Multiple choice

Why do leaves of plants appear green?

  1. Leaves absorb the green light, and reflect all the remaining six colours of sunlight.

  2. Leaves absorb all the six colours of sunlight, and reflect green colour.

  3. Leaves of a plant reflect sunlight.

  4. Leaves of a plant absorb sunlight.

  5. Roots absorb green material from the soil and accumulates them in leaves.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The colouring pigment, chlorophyll, present on the leaves absorbs all the six colours of sunlight and reflects green colour. This is why it appears green to us.

Multiple choice

Photosynthesis is an activity carried out by

  1. photoautotrophs

  2. cynobacteria

  3. Both 1 and 2

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

Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the Sun, into chemical energy that can be later released to fuel the organisms' activities (energy transformation). Most plants, most algae, and cyanobacteria perform photosynthesis. Such organisms are called photoautotrophs.

Multiple choice

Directions: The following question has four choices out of which ONLY ONE is correct.

Find out the wrong statement regarding the characteristics of photochemical reactions.

  1. Each molecule participating in a photo process absorbs multiple photons of radiant energy.

  2. The rate of photochemical reaction is dependent on the intensity of absorbed radiation.

  3. These reactions do not take place in dark.

  4. These reactions are independent of temperature.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Each molecule participating in a photochemical process absorbs only one photon of radiant energy. Thus, it can increase its energy level by hv only.

Multiple choice

Suppose you made an acidic interior of the thylakoids of isolated chloroplasts. Then, you transferred it in the dark to a pH-8 solution.

What would happen?

  1. Calvin cycle is activated.

  2. ATPs may be formed from isolated chloroplast.

  3. Both 1 and 2

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

As isolated thylakoids were transferred from acidic medium to basic medium, H+ proton will be emitted in a higher amount that causes conversion of ADP to ATP in a high frequency.

Multiple choice

Suppose you made an acidic interior of the thylakoids of isolated chloroplasts. Then, you transferred it in the dark to a pH-8 solution.

When sunlight is on the chloroplast, what would happen?

  1. Thylakoids enclose the spaces

  2. Grana enclose the spaces

  3. Calvin cycle recurs

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As sunlight falls on the chloroplast, thylakoids will enclose their spaces and photosynthesis will be started in a normal way.