Chemistry, asked by anuradhasurolia199, 10 months ago

My living world book of class 7 dav solution

Answers

Answered by Rameshjangid

Answer:

1. Food is needed by all organisms for many purposes:

The main function of food is to help in growth.
Food provides energy for movements such as running, walking, or raising our arms.
Food is also needed for the replacement and repair of damaged parts of the body.
Food gives us resistance to fight against diseases and protects us from infections

2. The presence of starch in leaves can be tested by the Iodine test. When we remove chlorophyll from the leaf by boiling it in alcohol and then putting 2 drops of iodine solution, its color change to blue indicating the presence of starch.

3. Green plants have chlorophyll in their leaves. The leaves use C02 and water to make food in presence of sunlight.

4. (a) autotrophs (b) starch (c) chlorophyll (d) carbon dioxide, oxygen

5. (i) cuscuta (ii) Insectivorous plant (iii) Stomata

6. (a) (ii) Parasite (b) (iii) Pitcher plant

7. (a) F (ii) F (iii) T (iu) T

8. (ii) Stomata

9. (iv) Leaves