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Photosynthesis

During photos...

Question

During photosynthesis, leaves convert water and carbon dioxide to a kind of sugar called glucose. If that is so, all food stored by the plant should be sweet. But this is not so. Why?

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Solution

Glucose: It is the most simple sugar that is formed as a result of photosynthesis in plants and is used for obtaining energy.
But glucose cannot be used as a storage of food so it is then converted into a complex sugar called starch, which does not have a sweet taste.
Therefore not all stored food by the plant tastes sweet.

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Q. The light coming from the sun is stored as energy in plants by the process of photosynthesis. This happens by converting carbon dioxide and water into:

Q. Copy these sentences in your notebook and complete them.
Leaves carry out photosynthesis..
___________________ is one of the substances required for photosynthesis. It is absorbed by roots and conducted to leaves through a tissue called ____________________. Leaves prepare food in the form of glucose which is stored as __________________. Prepared food is conducted to all parts of the plant body through a tissue known as __________________. Leaves also lose excess ________________ by the process called ________________. Leaves do this through the tiny pores on their surface called _____________________.

Mark ‘T’ if the statement is true and ‘F’ if it is false:

(i) Carbon dioxide is released during photosynthesis. (T/F)

(ii) Plants which synthesise their food are called saprotrophs. (T/F)

(iii) The product of photosynthesis is not a protein. (T/F)

(iv) Solar energy is converted into chemical energy during photosynthesis. (T/F)

Plants utilize carbon dioxide during photosynthesis. Which gas so they give out in the process?

Q. In photosynthesis, 6 molecules of carbon dioxide combine with an equal number of water molecules through a complex series of reactions to give a molecule of glucose having a molecular formula

C_{6} H_{12} O_{6}

. How many grams of water would be required to produce 18 g of glucose? Compute the volume of water so consumed assuming the density of water to be

1 g c m^{- 3}

.
Rreaction that takes place during photosynthesis is:

6 C O_{2} + 6 H_{2} O

⟶

C_{6} H_{12} O_{6} + 6 O_{2}

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