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

What are the two substances responsible for causing the gradient for increasing hyperosmolarity of medullary interstitium?

How does the pneumotaxic centre alter the respiratory rate?

Plant growth substances (PGS) have innumerable practical applications. Name the PGS you should use to: Increase yield of sugar cane.

What is the nature of nerve impulse?

With which organ's help is the excretion process accomplished in earthworms?

Name the types of fibres present in areolar tissues.

Which class of animals have symptoms of external ears and hair on the body?

Substance W is a chemical that inhibits spindle formation during cell division. If a meristematic sd plant cell were exposed to substance W, which BU process will not be able to occur in that plant cell?

Name the products of oxygenation of RuBP.

In a longitudinal section of root tip, starting from tip upwards, are the regions of:

1. Meristem, root cap, cell enlargement, cell maturation.
2. Cell maturation, cell enlargement, meristem, root cap.
3. Cell enlargement, cell maturation, root cap, meristem.
4. Root cap, meristem, cell enlargement, cell maturation.