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 botany living world of plants - plant physiology historical events in photosynthesis history of photosynthesis introduction to photosynthesis

Van Helmont concluded that plants get their food from

  1. Air

  2. Water

  3. Humus
  4. Air and ${H _2 O}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Van Helmont concluded that plants get their food from water. Van Helmont wanted to prove plants use materials from the soil to perform photosynthesis and done an experiment and proved that.

Multiple choice biology the leaf mechanism of absorption mineral absorption significance of transpiration

Photosynthesis is essential for survival of

  1. Animals

  2. Plants

  3. Most of the organisms

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Photosynthesis is plants taking in water, carbon dioxide, and light to make sugar and oxygen. This is important because all living things need oxygen to survive. All producers make oxygen and sugar for the secondary consumers and then the carnivores eat animals that eat the plants. If there is not enough producers to make the sugar and oxygen that all living things need then all living things will die out. Without producers CO2 couldn't be taken in by the plants to be turned back into oxygen that all animals need for survival. Also, without producers, herbivores wouldn't have anything to eat and they would all die leaving carnivores without food to eat and all life forms wouldn't be on Earth. Photosynthesis happens in the Chloroplast of the plant's organelle, if the Chloroplast wasn't in the plant Photosynthesis couldn't happen. If there was no sunlight for the plant to absorb then Photosynthesis couldn't happen. If living things didn't breathe out CO2 then the plants would die and living things would have no way of getting oxygen. These are the reasons why Photosynthesis is important to plants and all loving things on the planet.

So, the correct option is 'Option D'.
Multiple choice biology the leaf mechanism of absorption mineral absorption significance of transpiration

Photosynthesis in CAM-plants in minimal because of the limited amount of _________________.

  1. $CO _{2}$ fixed at night
  2. $O _{2}$ fixed at night
  3. $O _{2}$ fixed at day light
  4. $CO _{2}$ fixed at day light
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

CAM plants fix CO2 at night to minimize water loss. The total amount of photosynthesis is limited by the amount of CO2 they can fix during the night, which is stored as organic acids.

Multiple choice biology the leaf mechanism of absorption mineral absorption significance of transpiration

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

  1. Increasing atmospheric $CO _{2}$ concentration up to $0.05$% can enhance $CO _{2}$ fixation rate
  2. $C _{3}$ plants respond to higher temperatures with enhanced photosynthesis while $C _{4}$ plants have much lower temperature optimum
  3. Tomato is a greenhouse crop which can be grown in $CO _{2}$ - enriched atmosphere for higher yield

  4. None of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology the leaf mechanism of absorption mineral absorption significance of transpiration

A small mesophytic twig with green leaves is dipped into water in a big beaker under sunlight. It demonstrates

  1. Photosynthesis

  2. Respiration

  3. Transpiration

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

There will be loss of water through the leaves if the beaker is kept covered. Otherwise direct evaporation of water from free surface will also happen. The purpose of this experiment is to demonstrate transpiration, which is loss of water through leaves of plants in vapour form.

Multiple choice biology the leaf mechanism of absorption mineral absorption significance of transpiration

Which of the following is the significance of photosynthesis?

  1. Balance of carbon dioxide and oxygen

  2. Balance of nitrogen in the environment

  3. Provides food

  4. Both A and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the atmosphere, plants prepare food due to photosynthesis and release oxygen and animals release carbon dioxide by respiration. Animals inhale oxygen released by plants and plants use carbon dioxide for the process of photosynthesis. Hence balance of carbon dioxide and oxygen is maintained by photosynthesis. Plants use energy from sunlight to turn water and carbon dioxide into an energy-rich sugar called glucose.which is stored as starch inside the plant body. Plants provide food in the form of carbohydrates(glucose and starch).

So, the correct answer is 'Both A and C'.

Multiple choice evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

Green house crops such as tomatoes and bell pepper produce higher yields. This is due to.

  1. Tomatoes and bell pepper are not $C _3$ plants

  2. Due to diffused light in green house
  3. $CO _2$ is limiting factor to photosynthesis
  4. $CO _2$ enriched atmosphere leads to higher yield
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Growing crops in greenhouse produce higher yields due to a lot of reasons like - temperature control, carbon dioxide factor, reduced pest and disease exposure and humidity. 
  • The concentrated carbon dioxide results in larger leaves, stronger plant stems and possible early flowering and fruiting.
  • So the correct option is 'CO2 enriched atmosphere leads to higher yield'.
Multiple choice botany ecological adaptations, succession and ecological services ecosystem services ecosystems ecosystem

The process of photosynthesis and respiration cause the cycling of ........... through the environment.

  1. Carbon

  2. Water

  3. Nitrogen

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

The plants can fix carbon dioxide from the atmosphere which is taken in through stomata. The carbon dioxide is converted in the presence of light and chlorophyll pigments to synthesize carbon containing organic compounds such as sugar, fats and proteins. This creates the plant biomass which when eaten by other organisms recycles the carbon from on level to other. Finally the carbon enters the geosphere and then the atmosphere. The oxygen which is formed during photosynthesis is liberated in the atmosphere and used for cellular respiration. The oxygen is used to break down the molecules and release the carbon dioxide. The carbon gets recycled in the environment from plants to animals and then again enters the environment. 

Thus, the correct answer is option A. 

Multiple choice bio-chemistry cell biology cytoplasm the components in a cell component of the cell

These are colourless plastids

  1. Chromoplasts

  2. Chloroplasts

  3. Elaioplasts

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

Leucoplasts are a category of plastids that are colorless and non-pigmented, typically found in the non-photosynthetic tissues of plants. Chromoplasts contain pigments, and chloroplasts contain chlorophyll.

Multiple choice development of plants plant growth growth and development plant growth and development biology

Most effective wavelength of light for photosynthesis is

  1. Green

  2. Violet

  3. Red

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

Light is an essential factor for photosynthesis. There is a linear relationship between incident light and $CO _{2}$ fixation at low light intensities. At higher light intensities, gradually the rate does not show further increase as other factors become limiting. Light between 400-700 nm wavelength constitute the photosynthetically active radiation (PAR). Maximum photosynthesis takes place in red and blue light of the visible spectrum and minimum photosynthesis takes place in the green light. The most effective wavelength of light for photosynthesis is red because maximum absorption by chlorophyll a takes place in the red light.