Anil Ahlawat Solutions for Chapter: Life Processes, Exercise 2: EXERCISES

The given graph shows changes in the air pressure of lungs during breathing. What causes the change in air pressure during period X?

The given graph shows the changes in the volume of the lungs of a person at rest over a period of 20 seconds.

How many breaths per minute is the person taking when at rest?
Which two points in the graph (C, D, E or F), shows inspiration and expiration?

The thyrotropin releasing hormone (TRH) from the $\left(1\right)$ stimulates the $\left(2\right)$ to secrete the thyroid stimulating hormone (TSH), which in turn stimulates the thyroid gland to secrete thyroxine. A $\left(3\right)$ amount of thyroxine in the blood exerts $\left(4\right)$ effect on $\left(1\right)$ so that $\left(5\right)$ TRH and TSH are produced. This eventually $\left(6\right)$ the amount of thyroxine. It is called $\left(7\right)$ feed back control.

Refer to the following figure of phloem tissue.

Which of the following statements correctly describes the relationship between cells Y and Z?

The diagram shows a model of a nephron and its associated blood vessels.

This model has been criticised for being a poor representation of a nephron. Which of the following statements explain(s) this?

(i) The rubber tubing at $B$ is not split up into numerous branches like the capillary network of the glomerulus.

(ii) The rubber tubing at $B$ should be continuous and not contain small pores.