prepare a questionnaire of 20 marks of chapter life processes
Answers
Answer:1. In human alimentary canal, name the site of complete digestion of various components of food. Explain the process of digestion. [CBSE (CCE) 2012]
2. List in tabular form, three differences between arteries and veins. [CBS (CCE) 2012]
3. List the three kinds of blood vessels of human circulatory system and write their functions in tabular form. [CBSE I CCE) 2012]
4. (a) "The breathing cycle is rhythmic whereas exchange of gases is a continuous process". Justify this statement.
(b) What happens if conducting tubes of circulatory system develops a leak? State in brief, how could this be avoided? (c) How opening and closing of stomata takes place? [CBSE (CCE) 2011]
5. Draw a diagram of the front view of human heart and label any six parts including at least two that are concerned with arterial blood supply to the heart muscles. [CBSE (CCE) 2011]
6. Describe in brief the function of kidneys, ureters, urinary bladder and urethra. [Foreign 2010]
7. Explain the process of breakdown of glucose in a cell
(i) in the presence of oxygen, (ii) in the absence of oxygen. [HOTS,Foreign 2010]
8. (i) Label any 4 parts in the given diagram.
(h) What are the two functions represented in this diagram?
[HOTS, CBSE Sample Paper 2009]
9. What is double circulation in human beings? Why is it necessary?
[HOTS, NCERT, Delhi 2008C]
10. (a) Name two different ways in which glucose is oxidised to provide energy in various organism.
(b) Write any two differences between the two oxidation of glucose in organisms. [Al 2008]
11. Write any three differences between aerobic and anaerobic respiration. [HOTS, NCERT Exemplar, NCERT, AI 2008]
12. (a) Name the process by which autotrophs prepare town food.
(b) List the three events which occur during this process. (c) State two sources from which plants obtain nitrogen for the synthesis of proteins and other compounds. [Foreign 2008]
Previous Year Questions:
1 mark:
How do autotrophs obtain CO2 and N2 to make their food? [CBSE 2008]
Where does digestion of fat take place in our body? [CBSE 2009]
Name the green dot like structures in some cells observed by a student when a leaf peel was viewed under a microscope. What is this green colour due to? [CBSE 2010]
2 Marks:
Write one function each of the following components of the transport system in human beings: [CBSE 2008]
Blood vessels
Blood platelets
Lymph
Heart
3 marks:
How are oxygen and carbon dioxide transported in human beings? How are lungs designed to maximise the area for exchange of gases? [CBSE 2008]
5 MARKS:
1.(A) Draw a sectional view of the human heart and label on it Aorta, Pulmonary arteries, Vena cava, Left ventricle. [CBSE 2009]
(B) Why is double circulation of blood necessary in human beings?
OR
(A) Draw the structure of a nephron and label the following on it:
Glomerulus, Bowman’s capsule, Renal artery, Collecting duct.
(B) What happens to glucose that enters the nephron along with filtrate?
Explain the process of digestion of food in mouth, stomach and small intestine in human body. [CBSE 2010]
OR
(A) List the three events that occur during the process of photosynthesis,
Explain the role of stomata in this process.
(B) Describe an experiment to show that “sunlight is essential for photosynthesis.”
Explanation: