Question

1. If the pulse rate of an athlete is 95 per minute, what is the numbers of his heart beat in the

same time? [2]

2. What will happen if there are no platelets in the blood? [2]

3. What are xylem and phloem? State the function of xylem and phloem in plants. [3]

4. What is meant by reproduction? Name the two types of methods of reproduction in plants.

[3]

5. What are the various organ of the human excretory system? Draw the labelled diagram of

human excretory system. [5]

6. What is meant by asexual reproduction and what is meant by sexual reproduction in plant.

Give two examples of each. [5]​

Answer 1

Answer:

Solution:

Cardiac output = stroke volume Heart rate

Cardiac output = 5L or 5000 ml

Blood volume in ventricles at the end of diastole = 100 ml

Blood volume in ventricles at the end of systole = 50 ml

Stroke volume = 100 - 50

= 50 ml.

So,

5000 ml = 50 ml Heart rate

So, Heart rate = 100 beats per minute.