There has been an increase in the number | Class 11 Biology Chapter Animal Kingdom, Animal Kingdom NCERT Solutions

Excretory organs of different animals are given below. Choose correctly and write in the space provided.
Animal                     Excetory Organ/Unit
a. Balanoglossus      i. Metanephridia
b. Leech                   ii. Nephridia
c. Locust                  iii. Flame cells
d. Liver fluke            iv. absent
e. Sea urchin           v. malpighian tubule
f. Pila                       vi. Proboscis gland
a. ____________________, b. ____________________, c. ____________________
d. ____________________, e. ____________________, f. ____________________

Name the animal, which exhibits the phenomenon of bioluminescence. Mention the phylum to which it belongs.

Mention two modifications in reptiles required for terrestrial mode of life.

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.