Question

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.​

Answer 1

Answer:

1

in order to live

2 Idk

3 by performing a starch test with iodine

Answer 2

Answer:

1. Organisms need to take food to get energy and perform life processes. ... To perform all these life processes, the organism needs energy and nutrients. The energy to the organism is supplied through food. Food intake helps to perform all the activities and develops immunity to fight against infectious diseases..
2. Organisms which derive nutrition from the body of other living organisms (host) are called parasites. Organisms which derive nutrition from dead and decaying matter are called saprotrophs.
3. The presence of starch in leaves can be tested by Iodine test. When we remove chlorophyll from leaf by boiling it in alcohol and then put 2 drops of iodine solution, its colour change to blue indicates the presence of starch.
4. The process by which plants make food is photosynthesis. Photosynthesis is the process in which green plants use sunlight to make their own food. Photosynthesis requires sunlight, chlorophyll, water, and carbon dioxide gas. Chlorophyll is a substance in all green plants, especially in the leaves.