Cell The Unit of Life — BIOLOGY STD 11 Science — Question

All vertebrates possess:

1. Renal portal system.
2. Dorsal, hollow central nervous system.
3. Four chambered ventral heart.
4. Pharyngeal gill slits.

How does haemoglobin help in the transport of oxygen from lung to tissues?

Write four characteristics of striated muscles not found in smooth muscles.

After writing the names of any five false fishes, write there zoological name in front of them.

State the route of foul air from the lungs to outside. Also state whether TV increases or decreases during excitement and activity.

Give one word answer for following.

1. In brown algae, what is the function of frond present?
2. Name the constituents of cell wall in green algae.

How glycolysis takes place in anaerobic environment?

The neural system and the endocrine system jointly coordinate and regulate the physiological function of our body. How are the two systems different from each other in their method of functioning?

Is it possible to perform girdling experiments in monocots? Give reasons in support of your answer.

1. What is florigen?
2. Which hormone breaks seed dormancy? State the mechanism involved.