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 biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Thylakoids possess photosynthetic units called

  1. Quantasomes

  2. Glyoxysomes

  3. Polysomes

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

Quantasomes are particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place. They are embedded in a paracrystalline array on the surface of thylakoid discs in chloroplasts.

So, the correct option is 'Quantasomes'.

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Which one is not character of antennae?

  1. To make photosynthesis more efficient

  2. To make wider range of absorption of incoming light

  3. Provide electron to primary electron acceptor of photosystem

  4. Reaction center is not part of it
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The light harvesting complexes are made up of hundreds of pigment molecules bound to proteins. Each photosystem has all the pigments (except one molecule of chlorophyll a) forming a  light harvesting system also called antennae. These pigments help to make photosynthesis more efficient by absorbing different wavelengths of light. The single chlorophyll a molecules form the reaction center. Therefore, the reaction center is not a part of antennae. 

So, the correct option is 'Provide electron to primary electron acceptor of photosystem'.

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

In a chlorophyll molecule, the magnesium is situated in the

  1. corners of porphyrin

  2. centre of porphyrin

  3. isocyclic ring

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

A chlorophyll molecule has a hydrophobic "tail" that embeds the molecule into the thylakoid membrane. The "head" of a chlorophyll molecule is a ring called a porphyrin. The porphyrin ring of chlorophyll, which has a magnesium atom at its centre, is the part of a chlorophyll molecule that absorbs light energy.

So, the correct option is 'Centre of porphyrin'.

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Enzymes required for photophosphorylation are located in ............ of chloroplast.

  1. Peristromium

  2. Plastidome

  3. Stroma

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

A) The peristomium is the first true body segment in an annelid worm's body in the anterior end.

B) Plastid or plastidome refers to the entire unit where photosynthesis takes place.
C) Enzymes that are responsible for photophosphorylation are not present in the stroma.
D) Quantasomes are particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place. They are embedded in the surface of thylakoid discs in chloroplasts. They are composed of lipids and proteins that include various photosynthetic pigments and redox carriers. For this reason, they are considered to be photosynthetic units. They occur in 2 sizes: the smaller quantasome is thought to represent the site of photosystem I, the larger to represent the site of photosystem II which are involved in photophosphorylation. 
So the correct answer is 'Quantasome'.

Multiple choice zoology ecosystems decomposition in ecosystem ecosystem productivity and decomposition producers, consumers and decomposers

Which of the following factors is not limiting?

  1. CO$ _2$ concentration

  2. Light intensity

  3. Temperature

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

In most terrestrial and aquatic environments, oxygen is generally not a limiting factor for plant growth, whereas light, temperature, and CO2 concentration frequently limit the rate of photosynthesis.

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

In a plant, the following part performs photosynthesis 

  1. Leaves

  2. Stem

  3. Roots

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

The leaves of the plant possess the mesophyll tissue which contains the cellular organelle chloroplast. This organelle contains the chlorophyll pigments which are responsible for the absorption of light and conversion of this energy to synthesize food by the process of photosynthesis. 

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

Chlorophyll is a plant pigment that absorbs all frequencies of light except for

  1. Green

  2. Yellow

  3. Blue

  4. White

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

When white light is incident on an object , it absorbs some constituent colours of white light and some are reflected back , the combination of reflected colours decides the colour of an object that we see. 

We know that chlorophyll is of green colour , it means that it absorbs six constituent colours of white light and reflects only green colour i.e. it doesn't absorb green frequency.

Multiple choice chemistry adsorption and colloids adsorption theory of heterogeneous catalysis enzymes and catalysts catalysis

Chlorophyll, the green colouring matter in plants helps the process of photosynthesis by:

  1. acting as a catalyst

  2. converting soil into carbohydrates

  3. reacting with carbon dioxide

  4. fixing soil nitrogen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Chlorophyll plays a vital role by absorbing sunlight of a range of wavelengths, primarily blue and red. It is a catalyst for photosynthesis - increasing the speed of the reaction by taking part in it but remaining unchanged at the end.
Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Prokaryotes which can trap solar energy for ATP synthesis, but not for photosynthesis are

  1. Methanogens

  2. Thermoacidophiles

  3. Halophiles

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

  • Halophiles are the prokaryotes that can be aerobic or anaerobic. 
  • The phototropic anaerobic halophiles can trap solar energy for the synthesis of ATP i.e Adenosine Triphosphate with the help of ATP synthase enzyme. ATP is also known as the energy currency of a cell.
  • The correct answer is C.

Multiple choice biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

Guanine pigment is present in

  1. Tapetum lucidum

  2. Tapetum fibrosum

  3. Tapetum cellulosum

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

The tapetum lucidum is a layer of tissue in the eye of many vertebrates. Lying immediately behind the retina it reflects visible light back through the retina, increasing the light available to the photoreceptors. The tapetum lucidum contributes to the superior night vision of some animals. Many of these animals are nocturnal, especially carnivores that hunt their prey at night, while others are deep sea animals. Choroidal guanine tapetum is seen in Elasmobranchii (skates, rays, and sharks) and chimaeras. The tapetum is a palisade of cells containing stacks of flat hexagonal crystals of guanine.