An organism A which cannot move from one place to another, makes a simple food B from the substances C and D available in the environment. This food is made in the presence of a green coloured substance E present in organs F in the presence of light energy in a process called G. Some of the simple food B also gets converted into a complex food H for storage purposes. The food H gives a blue-black colour with dilute iodine solution.

1. What is (i) organism A, (ii) food B and (iii) food H?
2. What are C and D?
3. Name (i) green coloured substance E, and (ii) organ F.
4. What is the process G?

Draw a neat labelled diagram of the human excretory system.

1. Mention any two components of blood.
2. Trace the movement of oxygenated blood in the body.
3. Write the function of valves present in between atria and ventricles.
4. Write one structural difference between the composition of artery and veins.

Describe the structure and functioning of nephrons.

In the artificial kidneys, the tubes are all with semi-permeable lining. Why?

The process of ultra-filtration is essential in urine formation, where does this step occur in nephron?

What are the different modes of nutrition? Explain with one example of each mode of nutrition.

With a schematic diagram, explain the overall process of respiration in animals.

Plants absorb water from the soil. How does this water reach to the top of the tree? Explain in detail.

Describe the working of human blood circulatory system with the help of a suitable diagram which shows all the steps involved.