Respiration In Plants — BIOLOGY STD 11 Science — Question

Differentiate between cytotaxonomy and chemotaxonomy.

Define a taxon. Give some examples of taxa at different hierarchical levels.

Mention the location and significance of thymus gland in human body.

Avantika, who works in a publication house suffered from severe back pain, for the last three months. She visited a doctor, who explained that it was due to her wrong sitting posture during the office hours. He also suggested her that she should avoid long working hours continuously.

1. List two disorders that may be caused by wrong sitting posture.
2. Write the vertebral formula of humans.
3. What precautions should be taken to avoid such problem?
4. What value is shown by Avantika?

Kidney of adult rabbit is:

1. Pronephros.
2. Metanephros.
3. Mesonephros.
4. Opisthonephros.

What is meant by K value in enzyme reaction? What does it indicate?

1. What is a phosphodiester bond?
2. Explain competitive inhibition by giving an example.

Write a note on the usefulness of algae.

Osmosis is a special kind of diffusion, in which water diffuses across the cell membrane. The rate and direction of osmosis depends upon both ______________

Mention the role of crop, gizzard, tracheoles and compound eyes in cockroach.