Exercise
1. Why do organisms need to take food?
2. Distinguish between a parasite and a saprotroph.
3. How would you test the presence of starch in leave
4. Give a brief description of the process of synthesis
5. Show with the help of a sketch that the plants are
of food.
6. Fill in the blanks:
SI
(a) Green plants are called
their own food.
Answers
Answer:
oranisms need to take food
distinguish between parasites
please mark me as brillianist
1 - Organisms need to take food to get energy and perform life processes. A living organism undergoes many life processes like nutrition, respiration, digestion, transportation, excretion, circulation of blood, and reproduction. To perform all these life processes the organism needs energy and nutrients.
2 - Parasites are organisms that depend upon another organism (host) for food and cause harmful effects or dieseases to the host. Examples: Cuscuta (Amarbel), mosquitoes and head lice. saprotrophs are orgnisms that obtain nutrition from dead and decaying organic matter. Examples: Fungi and some bacteria.
3 - Starch testing
Iodine solution is used to test leaves for the presence of starch. You need to: heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour).
4 - Leaves contain the pigment chlorophyll which helps the plant to capture solar energy which is used to synthesize food from water and carbon dioxide. This process of synthesis of food in the presence of sunlight is known as photosynthesis.
5 - ParasiteSaprotroph They directly feed on living organisms for their nutrition.They feed on dead and decaying organis
fill up
Ans - Green plants are called autotrophs since they synthesise their own food.