LIFE PROCESSES – 1 Mark Questions

Q1. Why is energy is required by an organism even during sleep.

Q2. Give an example of an organism which derives nutrition from plants or animals without killing them. What are these organisms called?

Q3. In an experiment, saliva is added to the test tube containing pieces of bread (powdered). What will you observe?

Q4. What are the end products obtained on digestion of carbohydrates and proteins?

Q5. Name the cell organelle in which breakdown of pyruvate to give CO2, water and energy takes place.               

Q6.  It is seen that during aerobic respiration more energy is released as compared to the anaerobic respiration. Why?

Q7. During breathing cycle, what is the advantage of residual volume of air in lungs?

Q8. Why carbon dioxide is mostly transported in dissolved form?       

Q9. Why the walls of ventricles are thicker than the walls of atria?

Q10. What will happen if platelets are absent in the blood?

Q11.  Leakage of blood from vessels reduces the efficiency of pumping system. How is the leakage prevented?              

Q12. Why is right kidney placed slightly lower in position as compared to the left kidney?

Q13. Which substance is selectively reabsorbed by the tubular part of nephron?

Q14.  Out of about   170L of fluid filtered by the kidneys every day. How much is excreted in urine?

Q15. Name the substance which is present at a higher concentration in renal artery than in renal vein.

Q16. Why is urine yellow in colour?

Q17. Kidneys help in the process of osmoregulation? Explain.                    

Q18. Name two excretory products in plants other than oxygen and carbon dioxide.

Q19. Name a common nutrient that is absorbed in the small intestine and reabsorbed by the kidney tubules.

Q20. Where does digestion of fat takes place in our body?

Q21. What is the role of acid in our stomach?

Q22. Name the respiratory pigment in human beings. Where is this pigment found?  

Q23. Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?

Q24.Name the process of loss of water in the form of vapour from the aerial parts of the plants.

Q25. How is the amount of urine produced regulated?

Q26. How would the digestion of food be affected if the bile duct is completely blocked?

Q27. Name the structure marked as ‘X’ in the given figure and also mention the functions of this structure.


Q28.  Which raw material is responsible for the release of O2 in photosynthesis?

Q29.   What is mainly digested by stomach of man?

Q30.  What is common between respiration and transpiration process in plants?

Q31.  What will happen if a human being starts taking air with mouth instead of nose?

Q32.  What stops blood from flowing backwards through the heart?

Q33. When the right atrium contracts, blood flows from it to which part of the heart?       

Q34.What is the systolic and diastolic pressure of a normal man?

Q35.   Name the excretory organs in unicellular organisms.

Q36.   What are the major constituents of urine?

Q37.  State the process by which chemical from blood enter the dialysing fluid?

Q38.   Name the substance which is present in the blood, but not in the urine of a healthy person?

Q39. What is the main function of kidneys in humans?

Q40. Fishes die when taken out of water. Why?

Q41. Why does a piece of bread start tasting sweeter after it is chewed for sometime?

Q42. How is urine produced?

Q43.  What will happen if the liver of a person gets damaged?

Q44.  Compare between the process of respiration in plants during night and day time.

Q45.       Enumerate the difference between translocation and transpiration.

Q46.   Tabulate two differences between renal artery and renal vein.   

Directions (0.  Nos.47-51) In the following questions,  a statement of Assertion is followed by a statement of Reason. Mark the correct choice as

(a) If both Assertion and Reason are true, and Reason is the correct explanation of Assertion

(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

(c) If Assertion is true, but Reason is false

(d) If Reason is true, but Assertion is false

(e) If both Assertion and Reason are false

Q47. Assertion: Lungs always contain a residual volume of air.

            Reason: It is so to ensure enough time for the release of CO2 and for the absorption of O2 .

Q48. Assertion: In a healthy adult, the initial filtrate in the kidneys is about 180 L daily, but the actual volume excreted is only a litre a day.

            Reason: Most of the filtrate is lost from the body in the form of sweat.

Q49. Assertion: Respiration is opposite of Photosynthesis

            Reason: In Photosynthesis food is made from energy and in Respiration food is converted to energy.

Q50. Assertion: The four chambered heart does not mix oxygenated and deoxygenated blood.

            Reason: Four chambered heart is found in mammals with advanced body functions.

Q51. Assertion: Translocation of food occurs in Plants.

            Reason: Xylem tissue is responsible for Translocation.

Q52.  Select the incorrect pair.

(a) Respiration- – Oxidation of food to obtain energy

(b) Nutrition – Obtaining and utilising nutrients

(c) Transportation- Response to stimuli

(d) Excretion – Removed of waste by-products

Q53.  Which one of the following juices secreted in the human body does not contain any enzyme?

(a) Salivary juice

(b) Bile juice

(c) Gastric juice  

(d) Pancreatic juice

Q54.  Rings of cartilage present in the throat ensure that

(a) the air passage collapses

(b) the air passage does not collapse

(c) the air is filtered entering the nostrils

(d) None of the above

Q55. The function of the lymph fluid is to

(a) drains excess fluid from extracellular space back into the blood

(b) carries digested and absorbed fat from intestine

(c) circulates around the body and help in clotting of blood

(d) Both (a) and (b)


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