Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Differentiate between arithmetic growth and geometric growth.

Describe the steps of catalytic cycle of an enzyme action. Write any two factors which affect the enzymatic action.

OR

Describe the steps of catalytic action of an enzyme, till the formation of product.

OR

Describe the steps of catalytic cycle of an enzyme action.

A terrestrial animal must be able to:

1. Excrete large amounts of water in urine.
2. Conserve water.
3. Actively pump salts out through the skin.
4. Excrete large amounts of salts in urine.

In which of the following organisms sexes are not separate?

1. Ascaris.
2. Cockroach.
3. Pheretima.
4. Pila.

In Opuntia the stem is modified into a flattened green structure to perform the function of leaves (i.e., photosynthesis). Cite two other examples of modifications of plant parts for the purpose of photosynthesis.

Which one of the following sets of animals share a four chambered heart?

1. Amphibian, Reptiles, Birds.
2. Crocodiles, Birds, Mammals.
3. Crocodiles, Lizards, Turtles.
4. Lizards, Mammals, Birds.

Match the following list of animals with their level of organisation.

	Division of Labour		Animal
	Column I		Column II
A.	Organ level	i.	Pheretima
B.	Cellular aggregate level	ii.	Fasciola
C.	Tissue level	iii.	Spongilla
D.	Organ system level	iv.	Obelia

Choose the correct match showing division of labour with animal example.

1. i-B, ii-C, iii-D, and iv-A
2. i-B, ii-D, iii-C, and iv-A
3. i-D, ii-A, iii-B, and iv-C
4. i-A, ii-D, iii-C, and iv-B

How do fungi form partnership with most plants?

Mention any four physiological functions of glucocorticoids or cortisol in a human body.

Differentiate between radial and conjoint vascular bundles.