1. In human alimentary canal, name the site of complete digestion of various


components of food. Explain the process of digestion.


2. List in tabular form, three differences between arteries and veins.


3. List the three kinds of blood vessels of human circulatory system and write their


functions in tabular form.


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? 


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.


6. The part where the exchange of gases occurs during respiration is:


(a) Lungs and larynx (b) Alveoli and throat (c) Throat and lungs (d) Alveoli and capillaries


7.The back flow of blood during the pumping of blood by heart is prevented by: 

(a) Walls of ventricles.      (b) Walls of atrium (c) Valves in heart.             (d) Walls between atria and ventricles


8. The process of digestion is completed by:


(a) Intestinal juice 

(b) trypsin 

(c) bile juice

(d) pepsin


9. The extracellular fluid released from the capillaries is:

(a) serum (b) plasma (c) lymph (d) mucus


10. A few drops of iodine solution were added to rice water. The solution turned blue black in colour. This indicates that rice water contains


(a) complex proteins

(b) simple proteins

(c) fats

(d) starch


11. In which part of the alimentary canal food is finally digested?


(a) Stomach


(b) Mouth cavity (c) Large intestine (d) Small intestine 

12. When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence of


(a) oxygen (b) carbon dioxide (c) nitrogen (d) water vapour.


13. What prevents backflow of blood inside the heart during contraction? 

(a) Valves in heart 

(b) Thick muscular walls of ventricles

(c) Thin walls of atria

(d) All of the above.


14. In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body?


(a) Pisces and amphibians (b) Amphibians and reptiles (c) Amphibians only (d) Pisces only