DELHI PUBLIC SCHOOL R. N.
EXTENSION
(Under the aegis of the Delhi Public School Society, New Delhi)
Class X (Science)
Practice Worksheet
Life Process (Part 1)
Q1. From which structure, the free Oxygen gas produced during photosynthesis is released?
A) epidermis
B) Stomata
C) Cortex
D) Guard cell (1)
Q2. Opening and closing of stomatal pore depends on
A) atmospheric temperature
B) oxygen concentration around stomata
C) carbon dioxide concentration around stomata
D) water content in the guard cells (1)
Q3. Bile juice is stored in : (1)
a) Stomach b) gastric gland c) gall bladder d) villi
Q4. Which nutrient is digested by saliva? (1)
a) Protein b) sugar c) starch d) fats
Q5. Which of the following sphincter is present between stomach and small intestine? (1)
a) Pyloric sphincter b) ileocecal sphincter c) anal sphincter d) esophageal sphincter
Q6. In which blood cells haemoglobin the respiratory pigment is present ? (1)
a) WBC b) RBC c) Neutrophils d) Basophils
Q7. In alimentary canal, the specific enzyme/ juice secreted in locations (i), (ii) and (iii) are:
a) (i) amylase (ii) pepsin (iii) bile
b) (i) amylase (ii) bile (iii) trypsin
c) (i) lipase (ii) amylase (iii) pepsin
d) (i) trypsin (ii) bile (iii) amylase (1)
Q8. One of the following organisms can live without oxygen of air. This organism is
a) amoeba b) yak c) Yeast d) leech (1)
Q9. One of the following animals which uses trachea as the respiratory organs this animal is
a)Whale b) Snake c) Earthworm d) cockroach (1)
Q10. In which part of the cell glucose breaks down to form pyruvic acid?
a) Nucleus b) Ribosomes c) Mitochondria d) Cytoplasm (1)
Q11. Questions from 11 to 15 consist of two statements – Assertion (A) and Reason (R).
Answer these questions selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Q11. Assertion (A) : In anaerobic respiration, one of the end product is alcohol.
Reason (R) : There is an incomplete breakdown of glucose. (1)
Q12. Assertion (A) : In plants there is no need of specialised respiratory organs.
Reason (R) : Plants do not have great demands of gaseous exchange. (1)
Q13. Assertion (A) : Bile is essential for digestion of lipids.
Reason (R) : Bile juice contains enzymes. (1)
Q14. Assertion (A) :Aerobic respiration requires less energy as compared to anaerobic
respiration
Reason(R): Mitochondria is the powerhouse of the cell (1)
Q15. Assertion (A) : Liver is known as the smallest gland of the body.
Reason(R): It secretes bile juice. (1)
Q16. Stomata of desert plants remain closed during daytime how do they take up carbon dioxide
and perform photosynthesis? (2)
Q17. When a sportsman runs, he often gets muscle cramps. Why? (2)
Q18. Patients whose gallbladder is removed are recommended to eat less oily food. Why? (2)
Q19. Bile juice does not have any digestive enzyme but still plays a significant role in the
process of digestion. Justify the statement.
(2)
Q20. Differentiate between aerobic and anaerobic respiration. (2)
Q21. Write an experiment that shows Carbon dioxide is necessary for photosynthesis. (3)
Q22. a) What do you understand by the term residual volume and what is its use? (3)
b) What happens to the ribs and diaphragm during inhalation and exhalation?
Q23. State the function of the following in the alimentary canal.
i. Liver ii. Gall bladder iii. Villi (3)
Q24. Two green plants are kept separately in oxygen free containers, in the dark and other in the
continuous light. Which one will live longer? Give reasons. (3)
Q25. State the events occurring during the process of photosynthesis. Is it essential that these
steps take place one after the other immediately?
(3)
Q26. Explain the process of digestion of food in mouth, stomach and small intestine in human
body. (5)
Q27. Draw a well labelled diagram of alimentary canal and label the following parts:
a) Part which secretes bile juice
b) Part which secretes saliva
c) Part which has finger like projections for increasing the surface area. (5)
Q28. What are the different ways in which glucose is oxidized to provide energy in various
organisms? Explain (5)
Q29. During the respiration of an organism A, 1 molecule of glucose produces 2 ATP molecules
where as in the respiration of another organism B 1molecule of glucose produces 38 ATP
molecules.
a) Which organism is undergoing aerobic respiration?
b) Which organism is undergoing anaerobic respiration?
c) Which type of organism A or B can convert glucose into alcohol.
d) Name one organism which behaves like A. (5)
Q30. If the teeth are not cleaned regularly they are covered with a sticky yellowish layer W of
food particles and bacteria. Since layer W covers the teeth the alkaline liquid X secreted by
glands Y inside the mouth cannot reach the teeth surface to neutralize the acid formed by the
action of organism Z on sugary food and hands tooth decay sets in.
a) What is W known as?
b) What is X and Y
c) What is organism Z?
d) State one way of removing layer W from the teeth. (5)
