1. Why do organisms take food?
2. Distinguish between a parasite and a saprotroph.
3. How would you test the presence of starch in leaves?
4. Give a brief description of the process of synthesis of food in green plants.
5. Show with the help of a sketch that plants are the ultimate source of
food.
6. Fill in the blanks:
(a) Green plants are called _________________ since they synthesise
their own food.
(b) The food synthesised by plants is stored as _________________.
(c) In photosynthesis solar energy is absorbed by the pigment called
___________.
(d) During photosynthesis plants take in ______________________ and
release __________________ gas.
7. Name the following:
(i) A parasitic plant with yellow, slender and branched stem.
(ii) A plant that is partially autotrophic.
(iii) The pores through which leaves exchange gases.
8. Tick the correct answer:
(a) Cuscuta is an example of:
(i) autotroph (ii) parasite (iii) saprotroph (iv) host
(b) The plant which traps and feeds on insects is:
(i) Cuscuta (ii) china rose (iv) pitcher plant (iv) rose
9. Match the items given in Column I with those in Column II:
Column I Column II
Chlorophyll Rhizobium
Nitrogen Heterotrophs
Cuscuta Pitcher plant
Animals Leaf
Insects Parasite
10. 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)
Answers
Answer:
1. For their survival.
2. Parasite are those organisms that depend upon another organism (host) for food and cause harmful effects or diseases to the host. Examples: mosquitoes and head lice. Saprotrophs are organisms that obtain nutrition from dead and decaying organic matter.Examples: fungi, mushroom,etc.
3.By iodine solution.
4.The process of synthesis of food in green plants is called photosynthesis. This process takes place in the cells containing the green pigment chlorophyll. During photosynthesis, chlorophyll containing cells of leaves, in the presence of sunlight, use carbon dioxide and water to synthesis carbohydrates.The food synthesized by the plant is stored as Starch.
6.
a.producers/autotrops
b.starch
c.stomata
d.carbon dioxide oxygen
7
i.cuscuta
ii.Insectivorous plants
iii.stomata
8.a.ii.parasite
b.pitcher plant
9.chlorophyll-leaf
cuscuta- parasite
rhizobium-nitrogen
animals-heterotrophs
pitcher plant -insect
10.i T
ii.F
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Explanation: