Sino-atrial node is called the pacemaker | Class 11 Biology Chapter Body Fluids and Circulation, Body Fluids and Circulation NCERT Solutions

Write the differences between:
(a) Blood and Lymph
(b) Open and Closed system of circulation
(c) Systole and Diastole
(d) P-wave and T-wave

What is the difference between lymph and blood?

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.