PART - 2 - Unit V : CH - 14 Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Two groups (A and B) of bean plants of similar size and same leaf area were placed in identical conditions. Group A was exposed to light of wavelength 400-450 nm and Group B to light of wavelength of 500-550 nm. Compare the photosynthetic rate of the two groups giving reason.

Rahul's father bought an aquarium to home, while looking at the fishes, Rahul wondered that fishes, though small, can breathe efficiently in water. He wondered why do humans die of drowning. Next day, he asked his biology teacher about the same. The teacher explained that fishes have special respiratory organ, which allow them to breathe inside water. Rahul was amazed to know that even respiratory organs differ in different animal groups.

1. Give the name of the respiratory organ of fishes.
2. How do humans swim and breathe inside water?
3. Give the name of the respiratory organ of humans.
4. What values are displayed by Rahul?

A cell has 32 chromosomes. It undergoes mitotic division. What will be the chromosome number (N) during metaphase? What would be the DNA content (C) during anaphase?

What is the chemical equation to express photosynthesis?

Enlist any four significant points of meiosis.

In how many classes was the superclass Tetrapoda classified? Write name.

Explain Blackman's law of limiting factors. Explain it with the help of a suitable example.

George comes on a vacation to India from US. The long journey disturbs his biological clock and he suffers from jet lag. What is the cause of his discomfort?

Point out a non-parasite:

1. Tapeworm.
2. Mosquito.
3. Leech.
4. Sea anemone.

Given below are the pairs of some proteins and their functions. Which out of these is not a matching pair and why?

S. No.	Protein	Function
(a)	Collagen	Intercellular ground substance
(b)	Antibody	Fight infectious agents
(c)	Insulin	Enzyme
(d)	GLUT-4	Enables glucose transport into cells