Which of the following types of light are strongly absorbed by plants

  1. Violet and orenge
  2. Blue and Red
  3. Indigo and yellow
  4. yellow and Violet

Blue and Red

Most of the oxygen on earth is produced by

  1. Grasses
  2. Algae
  3. Trees
  4. Paddy fields


Photosynthesis occurs in

  1. Night
  2. Day and night
  3. Day and night
  4. Only day

Day or night

The process by which plants produce food is called

  1. Carbohydrolysis
  2. Metabolic synthesis
  3. Photosensitization
  4. Photosynthesis


The process by which plants synthesize their food is called

  1. Osmosis
  2. Respiration
  3. Photosynthesis
  4. Plasmolysis


Photosynthesis occurs in

  1. Nucleus
  2. Mitochondrial
  3. Chloroplast
  4. Peroxisome


Which one of the following gases is essential for photosynthesis process

  1. CO
  2. CO2
  3. N2
  4. O2


Oxygen, which is liberated during photosynthesis comes from

  1. Water
  2. Carbon dioxide
  3. Chlorophyll
  4. Phosphoglyceric acid


It happens during the photosynthesis in green plants

  1. Taking nitrogen and releasing oxygen
  2. Taking CO2 and releasing and releasing oxygen
  3. Taking oxygen and releasing CO2
  4. Taking oxygen and releasing nitrogen

Taking CO2 and releasing oxygen

Which one of the following gases is used by plants in photosynthesis

  1. Ammonia
  2. Carbon dioxide
  3. Chlorine
  4. Sulphur dioxide

Carbon dioxide

Light energy changes into the chemical energy by which of the following process

  1. Electrolysis
  2. By photosynthesis
  3. By respiration
  4. By spewing

By photosynthesis

Which one of the following is the process involved in photosynthesis

  1. Potential energy is released to form free energy
  2. Free energy is converted into potential energy and stored
  3. Food is oxidized to release carbon dioxide and water
  4. Oxygen is taken and carbon dioxide and water vapour are given out

Free energy is converted into potential energy and stored

The most active light for photosynthesis is

  1. Violet light
  2. Red light
  3. Blue light
  4. Green light

Red light

Which light is most effective in photosynthesis

  1. Red
  2. Blue
  3. Green
  4. Violet


What rays of sunlight are mostly utilized by Chlorophyll in photosynthesis

  1. Red
  2. Yellow
  3. Green
  4. Blue


Artificial light can

  1. Destroy Chlorophyll
  2. Synthesis Chlorophyll
  3. Bring about photosynthesis
  4. Not bring about photosynthesis

Bring about photosynthesis

Which of the following has the maximum efficiency to convert solar energy into chemical energy

  1. Chorella
  2. Tiger
  3. Earthworm
  4. Cuscutta


Which of the following is not the work of roots

  1. Photosynthesis
  2. Water absorption
  3. Absorption nutrients
  4. To help the plants


When the bark of a tree is removed in a circular fasion all around near its base, it gradually dries up or dries because

  1. Water from soil cannot rise to aerial parts
  2. Roots are starved of energy
  3. Tree is infected by the soil microbes
  4. Roots do not receive oxygen for respiration

Roots are starved of energy

“Phloem” in plants is mainly responsible for

  1. Transportation of food
  2. Transportation of amino acid
  3. Transportation of oxygen
  4. Transportation of water

Transportation of food

Which one of the following does not increase the amount of carbon dioxide in carbon cycle on earth

  1. Respiration
  2. Photosynthesis
  3. Decay of organic matter
  4. Volcanic action


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