10th Biology - Unit Test 3 Question Paper

 

 

UNIT.TEST.3

CLASS:X                                                                                            MARKS :50

SUBJECT:BIOLOGY                                                                               TIME:1.30 hrs

I.CHOOSE THE CORRECT ANSWER.                                                          6X1=6

 

1.Water which is absorbed by roots is transported to aerial parts of the plant through:

(a) cortex(b) epidermis(c) phloem(d) xylem

2.Which one of the following regarding blood composition is correct?

(a) Plasma – Blood + Lymphocyte

(b) Serum – Blood + Fibrinogen

(c) Lymph – Plasma + RBC + WBC

(d) Blood – Plasma + RBC + WBC + Platelets

3. The wall of human heart is made of:
(a) Endocardium(b) Epicardium(c) Myocardium(d) All of the above

4.A patient with blood group 0 was injured in an accident and has blood loss. Which blood group the doctor should effectively use for transfusion in this condition?

(a) O group(b) AB group(c) A or B group(d) all blood group

5.Assertion: RBC plays an important role in the transport of respiratory gases.

Reason: RBC does not have cell organelles and nucleus.

6.The apices of the flaps of tricuspid valves are held in position by __.(a)  chordaetendineae  (b) AV node(c) Purkinje fibres(d) Bundle of His.

 

II.ANSWER ANY 7 OF THE FOLLOWING.                                  7X2=14

1.Why is the colour of the blood-red?

2.Mention the artery which supplies blood to the heart muscle.

3. What causes the opening and closing of guard cells of stomata during transpiration?

4. What is cohesion?

5. What would happen to the leaves of a plant that transpires more water than its absorption in the roots?

6. What are heart sounds? How are they produced?

7. Who discovered the Rh factor? Why was it named so?

8.What would happen to the leaves of a plant that transpires more water than its absorption in the roots?

IIl.ANSWER ANY 4 OF THE FOLLOWING.                                   4X4=16

1. Why is the circulation in man referred to as double circulation?

2. Explain cardiac cycle.

3.  Draw a labelled a) Root tip with root hairs.
(b) Guard cell in turgid and Flacid condition.

4. Why is the Sinoatrial node called the pacemaker of heart?

5. Enumerate the functions of blood.

 

Iv.ANSWER  THE FOLLOWING.                                   7X2=14

1. Why is the circulation in man referred to as double circulation?

1a.How are arteries and veins structurally different from one another?(or)b. How do plants absorb water? Explain.

2. a.Describe the structure and working of the human heart. (or)

b.Why are leucocytes classified as granulocytes and agranulocytes? Name each cell and mention its functions.