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

What is the difference between excretion and defecation? Explain the process of excretion in humans.

Differentiate between an autotroph and a heterotroph.

1. A gas is released during photosynthesis. Name the gas and also state the way by which the gas is evolved.
2. What are stomata? What governs the opening and closing of stomata?

X is a wild animal which eats only the flesh of other animals whereas Y is a domestic animal which feeds mainly on green grass.

1. What are animals like X known as?
2. What are animals Y known as?
3. Which animal, X or Y, has a longer small intestine? Why?
4. Name one animal which is like X.
5. Name one animal which is like Y.

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

1. Draw a diagram of human alimentary canal and label on it: Oesophagus, Gallbladder, Liver and Pancreas.
2. Explain the statement, ‘Bile does not contain any enzyme but it is essential for digestion.’

Explain the process of digestion of food in mouth, stomach and small intestine in human body.

Draw a labelled diagram of the human respiratory system.

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