Draw a sieve tube and label the various parts. Name the dead elements of the phloem.

Differentiate between left lung and right lung of humans.

Differentiate between lymphatic capillaries and blood capillaries.

Name the main organs of the human digestive system in the order they participate in the process of digestion. Describe how digestion of carbohydrates and proteins take place in our body.

What is meant by breathing? What happens to the rate of breathing during vigorous exercise and why?