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 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 biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Quantasome is a unit related to

  1. Respiration

  2. Ascent of sap

  3. Growth

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

A) Quantasomes are not involved in respiration.
B) Xylem is involved in the ascent of sap. Quantasomes do not play a part in the ascent of sap.

C) Quantasomes are involved in photosynthesis. They do not directly contribute to growth.
D) Quantasomes are particles found on the inner thylakoid membrane of chloroplasts in which photosynthesis takes place.
So the correct answer is 'Photosynthesis'.

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

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

Chief functions of leaves are

  1. Transpiration and photosynthesis

  2. Respiration and photosynthesis

  3. Respiration and digestion

  4. Respiration and transpiration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The function of the stomata is to allow water vapor and gases to pass in and out of the leaf. The stomata are also responsible for the process of transpiration, the rate at which a plant loses water. Air enters the plant through the stomata. The air contains carbon dioxide which is used in the photosynthesis process. Then the transpiration and photosynthesis are the main functions of leaves.

So, the correct option is A.

Multiple choice

How does photosynthesis benefit both plants and animals?

  1. plants take in CO2 and release O2

  2. plants take in O2 and release CO2

  3. plants grow into food for consumption

  4. it only benefits plants
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Photosynthesis removes carbon dioxide from the atmosphere and releases oxygen as a byproduct, which is essential for the respiration of most living organisms.

Multiple choice zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

The hypothesis that all photosynthetic organisms require a source of hydrogen was first proposed by ______________.

  1. Van Niel

  2. Hatch and Slack

  3. Robin Hill

  4. Ruber and Kamen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

C.B. van Niel proposed that photosynthesis is a light-dependent redox reaction in which hydrogen from a donor (like H2O or H2S) reduces CO2 to carbohydrates.

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

Carbohydrates are produced by

  1. Some bacteria, algae and green plant cells

  2. Fungi, algae and green plant cells

  3. All bacteria, fungi and algae

  4. Viruses, fungi and bacteria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbohydrates are the most abundant biomolecules found on the face of the earth. This is so because every year plants and algae through the process of photosynthesis convert more than 100 billion metric tons of carbon dioxide and water to cellulose and other products for use by the plants. Some bacteria undergo photosynthesis but it is anoxygenic as bacteria has only pigment system I. Thus, the correct answer is option A.

Multiple choice biology human system gas exchange and smoking gas exchange gas exchange in humans

Which of the following might happen if plants stop releasing oxygen into the atmosphere?

  1. Plants will be healthier

  2. Number of plants will increase

  3. Number of animals will increase

  4. Animals will die from the lack of oxygen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • All plants and animals on earth engage in a process called respiration.
  • Respiration combines oxygen and the food created during photosynthesis to produce usable energy. 
  • One of the byproducts of respiration is CO2,  if plants stop to take up CO2 and stop releasing O2, then plants will stop to convert sunlight into carbohydrates, and die.
  •  The death of autotrophs would lead to a chain reaction to the death of all higher-order organisms. Hence, Animals will die from the lack of oxygen if plants stop releasing oxygen into the atmosphere.
So, the correct answer is 'Animals will die from the lack of oxygen'.

Multiple choice business organisation and correspondence environmental pollution and industries air pollution and its effects the environment and us environment and conservation

Some effects of SO$ _2$ and its transformation products on plants include 

  1. Chlorophyll destruction

  2. Chlorophyll plasmolysis

  3. Golgi body destruction

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

The presence of pollutant adversely affect the plants. Reduction in chlorophyll is caused by toxic ions formed by the dissolution of SO$ _2$ in water inside leaf tissue, which preferentially incorporate into thylakoid membrane disturbs the photosystems. The oxides of sulphur transform into several poisonous substances which hamper the growth of the plants.

So, the correct option is A.