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 is a reactant of photosynthesis?

  1. Carbon monoxide

  2. Glucose

  3. Oxygen

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

Photosynthesis uses carbon dioxide and water as reactants to produce glucose and oxygen. Carbon monoxide is toxic and not a reactant, while glucose and oxygen are products.

Multiple choice

Which is a PRODUCT of photosynthesis?

  1. Oxygen

  2. Water

  3. Sunlight

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

Oxygen is released as a byproduct of photosynthesis. Water and sunlight are inputs, and carbon monoxide is not involved in this process.

Multiple choice

What's SIMILAR about the carbon and nitrogen cycles?

  1. Animals gain both N and C through cellular respiration.

  2. Plants get both nitrogen and carbon from the air.

  3. Animals use consumption to get both N and C.

  4. Plants use photosynthesis to get both N and C.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Both carbon and nitrogen are essential nutrients that animals obtain by consuming other organisms. Plants do not get both from the air, and animals do not get them through respiration.

Multiple choice

How is decomposition involved in the carbon cycle?

  1. Things take in carbon dioxide as they decompose.

  2. Things release carbon dioxide as they decompose.

  3. Decomposition is always accompanied by photosynthesis.

  4. Decomposition isn't involved in the carbon cycle.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Decomposers break down organic matter, and during this metabolic process, they release carbon dioxide back into the atmosphere as a byproduct of their cellular respiration.

Multiple choice

How does carbon move from nonliving to living things?

  1. cellular respiration

  2. dissolving

  3. photosynthesis

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

Photosynthesis is the process by which autotrophs (like plants) take inorganic carbon dioxide from the atmosphere and convert it into organic carbon (glucose), effectively moving carbon into the living world.

Multiple choice

fungi has chlorophyll

  1. True

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

Fungi are heterotrophic organisms that obtain nutrients by absorbing organic matter. They lack chlorophyll and cannot perform photosynthesis.

Multiple choice

During Respiration leaves use __________

  1. Oxygen and Glucose

  2. Carbon-di-oxide and Water

  3. Oxygen and Water

  4. Carbon-di-oxide and Glucose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During cellular respiration, plants (like other organisms) break down glucose in the presence of oxygen to release energy, producing carbon dioxide and water as byproducts.

Multiple choice

When does respiration take place in plants?

  1. During the day

  2. During the night

  3. It is a continuous process (day & night)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Respiration is a metabolic process that occurs continuously in all living cells, including plant cells, to provide energy for life functions.

Multiple choice

Spongy Mesophyll contains chlorophyll

  1. True

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

The spongy mesophyll contains chloroplasts and is responsible for photosynthesis, although it has fewer chloroplasts than the palisade layer.

Multiple choice

Which equation represents photosynthesis?

  1. CO2 + H20 + sunlight + chlorophyll → glucose + oxygen

  2. CO2 + sunlight + chlorophyll → glucose + oxygen

  3. CO2 + H20 + sunlight + chlorophyll → glucose

  4. CO2 + H20 + chlorophyll → glucose + oxygen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Photosynthesis uses carbon dioxide and water in the presence of sunlight and chlorophyll to produce glucose and oxygen. Option A correctly lists all necessary reactants and products.

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

The product of the light reaction of photosynthesis which is not common between cyclic and non-cyclic photophosphorylation and is not utilised in the Calvin cycle is 

  1. O$ _2$

  2. ATP
  3. $NADPH _2$
  4. O$ _2$ and ATP
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In cyclic phosphorylation, oxygen is not evolved as the by-product where as, oxygen is evolved as a by-product during non-cyclic phosphorylation. Calvin cycle is the second stage of photosynthesis in which carbon atoms from carbon dioxide are combined, using the energy in ATP and NADPH, to make glucose.

So, the correct option is 'O$ _{2}$'.

Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

How many quanta of lights are required to evolve one oxygen molecule in photosythesis?

  1. Three

  2. Eight

  3. Four

  4. Two
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
 The quantum of light required in photosynthesis is 8 photons for one molecule of oxygen to be evolved. In this, 4 photons are required by photosystem II and 4 by photosystem I. The equation for the same is, 
2 x 2H$ _2$O --> 4H$^+$ + O$ _2$ + 4 electrons. 
Thus, the correct answer is 'Eight.'
Multiple choice botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

During the light phase of photosynthesis .......... is oxidized and .......... is reduced.

  1. $CO _2$ and Water
  2. Water and $CO _2$
  3. Water and $NADP$
  4. $NADPH _2$ and $CO _2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The light reaction takes place in thylakoid discs. There, water is oxidized and oxygen is released. The hydrogen is accepted by $NADP$ and hence get reduced to $NADPH _2$. 

So the correct answer is 'water and $NADP$' respectively.