Q1. What are the many different ways in which glucose is oxidised to provide energy in various organisms?
Q2. Describe the breathing process in human beings.
Q3. (i) Draw a schematic representation of transport and exchange of oxygen and carbon dioxide during transportation of blood in human beings and label following parts on it.
Lung to capillaries, pulmonary artery to lungs, aorta to body, pulmonary veins from lungs.
(ii) What is the advantage of having separate channels of heart for oxygenated and deoxygenated blood in mammals and birds?
Q4. What according to you is the advantage of having a four- chambered heart?
Q5. (i) Draw the structure of a nephron and label the following parts on it.
(a) Renal artery
(b) Bowman’s capsule
(d) Collecting duct
(ii) Name four substances in the initial filtrate which are selectively reabsorbed as the filtrate floor along the tubule.
Q6. Waste products of plants are useful for human beings. Is it true? Explain.
Q7. (a) State the form in which the following are stored:
(i) Unused carbohydrates in plants
(ii) The energy derived from food in humans.
(b) Describe the process of nutrition in Amoeba with the help of diagram.
(c) How does Paramecium obtain its food?
Q8. (i) Name the process and explain the type of nutrition found in green plants. List the raw materials required for this process. Give chemical equation for the mentioned process.
(ii) Write three events that occur during this process.
Q9. (a) Write the reaction that occurs when glucose breaks down anaerobically in yeast.
(b) Write the mechanism by which fishes’ breath in water.
(c) Name the balloon likes structures present in lungs. List its two functions.
(d) Name the respiratory pigment and write its role in human beings.
Q10. (a) Draw diagram of cross-section of the human heart and label the following parts:
(i) Right ventricle
(iii) Left atrium
(iv) Pulmonary arteries.
(b) Give reasons for the following:
(i) The muscular walls of ventricles are thicker than the walls of atria.
(ii) Arteries have thick elastic walls.
Q11. (a) Mention any two components of blood.
(b) Trace the movement of oxygenated blood in the body.
(c) Write the function of valves present in between atria and ventricles.
(d) Write the structural difference between the composition of artery and veins.
Q12. (a) Draw a diagram of human excretory system and label the following parts on it:
(i) Right Renal Artery
(ii) Vena cava.
(iii) Urinary bladder
(iv) Left kidney
(b) List two vital functions of the kidney.
Q13. (a) Define excretion.
(b) Name the basic filtration unit present in the kidney.
(c) Draw excretory system in human being and label the following organs of excretory system which perform following functions:
(i) form urine
(ii) is a long tube which collects urine from kidney.
(iii) store urine until it is passed out.
Q14. (a) Draw a diagram of human excretory system and label the following:
(i) part in which urine is produced
(ii) part which stores the urine
(iii) part which connects (i) and (ii)
(iv) part from which urine is passed out.
(b) Name the factors on which the amount of water reabsorbed along the tubular part of nephron depend on?
Q15. (a) In which form are oxygen and CO2 transported in the blood?
(b) What happens to the muscles of the diaphragm, the external intercostal muscles and the position of diaphragm during inspiration and expiration?
(c) Why do the walls of trachea not collapse, when there is less air in it?
Q16. Santosh told his father that plants give out a lot of water in the form of vapour through leaves. Define this process. What is its importance? How do stomata help in this process?
Q17. Explain the digestion of a roti in human beings. Draw a diagram depicting human alimentary canal.
Q18. Name a circulatory fluid in the human body other than blood. State its functions. How does it differ from blood?
Q19. Explain how deoxygenated blood travel from body to lung for purification. Draw well-labelled diagram in support of your answer.
Q20. Plants absorb water from the soil. How does this water reach to the top of the tree? Explain in detail.
Q21. (i) How does food prepared by leaves is utilised by roots? Explain.
(ii) Water is absorbed by roots and lost through leaves. How does this happen?
Q22. What is the difference between excretion and defecation? Explain the process of excretion in humans.