State the different modes of CO2 transpo | Class 11 Biology Chapter Breathing and Exchange of Gasses, Breathing and Exchange of Gasses NCERT Solutions

Name the important parts involved in creating a pressure gradient between lungs and the atmosphere during normal respiration.

Define oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?

Cigarette smoking causes emphysema. Give reason.

Distinguish between
(a) IRV and ERV
(b) Inspiratory capacity and Expiratory capacity
(c) Vital capacity and Total lung capacity

A fluid filled double membranous layer surrounds the lungs. Name it and mention its important function.

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

What are the steps involved in formation of a root nodule?

Name the pathological condition when uncontrolled cell division occurs.
 

Aquatic animals generally are ammonotelic in nature where as terrestual forms are not. Comment.
 

Name the cells/tissues in human body which
a. exhibit ameboid movement
b. exhibit ciliary movement

How do you distinguish between a skeletal muscle and a cardiac muscle?

Why earthworm is called the friend of farmer?
 

Which of the following is correct:
(a) Cells of all living organisms have a nucleus.
(b) Both animal and plant cells have a well defined cell wall.
(c) In prokaryotes, there are no membrane bound organelles.
(d) Cells are formed de novo from abiotic materials.

Mitosis results in producing two cells which are similar to each other. What would be the consequence if each of the following irregularities
occur during mitosis?
a. Nuclear membrane fails to disintegrate
b. Duplication of DNA does not occur
c. Centromeres do not divide
d. Cytokinesis does not occur.