Assignment: 

Q1: What do you mean by residual volume of air? What is its function? 

Q2:.Why is diffusion insufficient to meet the oxygen requirement of the body?

Q3: Explain the events of photosynthesis.

Q4: Give schematic figure showing break down of glucose by various pathways.

Q5: Why is breathing rate much faster in aquatic organism than others?

Q6: Differentiate artery and vein with respect to

i. Wall
ii. Direction of blood flow.
iii. Valves

Q7: Why are capillaries thin walled?

Q8: The wall of ventricle is thicker than atrium. Why?

Q9:. Write the functions of Valve of heart.

Q10:  Why do plants need low energy than animals?

Q11: Name the process of movement of ions into the root cells.

Q12: How does water rise in tall trees?

Q13:  Which process transports soluble products of Photosynthesis?

Q14: In which form photosynthetic is transported in phloem tissue?

Q15: Explain the mechanism of transport of photosynthate?

Q16: Define excretion?

Q16: Name two main constituent of urine.

Q17: Describe the mechanism of urine formation.

Q18: Name three causes that reduce the activity of kidney.

Q19: What are the various ways of excretion by plant?

Q20: Draw the labeled diagram of:
i. Main organs of excretion in human.
ii. Main organs of respiration.
iii. Digestive system.
iv. Human heart.
v. Nutrition in Amoeba.
vi. Stomata.
vii. Glomerulus.