Photosynthesis is a process through which green plants can make their own food. Conditions needed for photosynthesis include the presence of carbon dioxide, water, chlorophyll and sunlight. The process through which reserved starch are removed from plant by keeping the plant in a darkroom is called destarching.

Quantasomes are particles found in the chloroplast thylakoid membrane where photosynthesis occurs. They are considered as photosynthetic units which is equivalent to a packet containing 250-300 chlorophyll molecules, carotenoids, quinone compounds, phospholipids, etc.

Stroma is a protein colloidal complex that fits the interior of the chloroplast are regarded as the site of light reaction of photosynthesis units are located there. Granum are green coloured structures embedded in the stroma, each consists of many disc-shaped membranous sac called thylakoids.

Producers are those organisms that can produce their own food. Plants are known as producers. The food chain is a series of living beings that depend on each other as a source of food. At the bottom of the food chain, are the producers. All the other organisms above the producers are consumers.

Photosynthesis can be characterised as a process by which green plants produce organic substances by converting light energy. The plants store food in the form of starch which is a polymer of glucose. The solution of iodine converts into a blue-black colour in the presence of starch. Hence, this solution is used as an experimental tool for photosynthesis.

E M B I B E

ICSE Self - Study in Biology>Chapter 5 - Photosynthesis>TEST YOURSELF>Q 7

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Define photophosphorylation.

Important Questions on Photosynthesis

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10th ICSE

IMPORTANT

ICSE Self - Study in Biology>Chapter 5 - Photosynthesis>TEST YOURSELF>Q 7

Define biosynthetic phase.

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10th ICSE

IMPORTANT

ICSE Self - Study in Biology>Chapter 5 - Photosynthesis>TEST YOURSELF>Q 7

Define destarching.

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10th ICSE

IMPORTANT

ICSE Self - Study in Biology>Chapter 5 - Photosynthesis>TEST YOURSELF>Q 7

Define quantasome.

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10th ICSE

IMPORTANT

ICSE Self - Study in Biology>Chapter 5 - Photosynthesis>TEST YOURSELF>Q 7

Define thylakoid.

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10th ICSE

IMPORTANT

ICSE Self - Study in Biology>Chapter 5 - Photosynthesis>TEST YOURSELF>Q 7

Define Hill reaction.

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10th ICSE

IMPORTANT

ICSE Self - Study in Biology>Chapter 5 - Photosynthesis>TEST YOURSELF>Q 7

Define producers.

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10th ICSE

IMPORTANT

ICSE Self - Study in Biology>Chapter 5 - Photosynthesis>TEST YOURSELF>Q 7

Define iodine test.

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10th ICSE

IMPORTANT

ICSE Self - Study in Biology>Chapter 5 - Photosynthesis>TEST YOURSELF>Q 8

A small piece of aquatic plant is taken in a test tube with pond water and kept in bright sunlight for 5-6 hrs. Bubbles of gas are coming out which gradually decrease when the intensity of sunlight decreases and no bubbles will evolve in complete darkness.

What is the aim of the experiment?

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