Body Fluids and Circulation

NEET Biology · 91 questions · Page 6 of 10 · Click an option or "Show Solution" to reveal answer

Q51

In mammals, histamine is secreted by

A histiocytes

B lymphocytes

C mast cells

D fibroblasts

Correct Answer

Option C

Solution

Q52

What is true about leucocytes ?

A Their sudden fall in number is indication of blood cancer.

B These are produced in thymus.

C These are enucleated.

D These can squeeze out through the capillary walls.

Correct Answer

Option D

Solution

(d) Leucocytes are capable of coming out of blood capillaries through the process of diapedesis.

Q53

What is correct for blood group O?

A No antigens but both a and b antibodies are present

B A antigen and B antibody

C Antigen and antibody both absent

D A and B antigens and A, B antibodies

Correct Answer

Option A

Solution

(a) Blood group O does not contain antigens but has anti-A and anti-B antibodies.

Q54

Which of the following statements is true for lymph?

A WBC and serum

B all components of blood except RBCs and some proteins

C RBCs, WBCs and plasma

D RBCs proteins and platelets

Correct Answer

Option B

Solution

(b) Lymph is a colourless vascular connective tissue derived from tissue fluid. RBCs and platelets are absent.

Q55

You are required to draw blood from a patient and keep it in a test tube for analysis. Which test tube will you not use?

A Test tube containing calcium bicarbonate

B Chilled test tube

C Test tube containing heparin

D Test tube containing sodium oxalate

Correct Answer

Option A

Solution

(a) Presence of calcium will promote blood clotting. Sodium oxalate and heparin prevent blood clotting.

Q56

In the ABO system of blood groups, if both antigens are present but no antibody, the blood group of the individual would be

A B

B O

C AB

D A

Correct Answer

Option C

Solution

Q57

Which one of the following statements is incorrect?

A The presence of non-respiratory air sacs, increases the efficiency of respiration in birds.

B In insects, circulating body fluids serve to distribute oxygen to tissues.

C The principle of countercurrent flow facilitates efficient respiration in gills of fishes.

D The residual area in lungs slightly decreases the efficiency of respiration in mammals.

Correct Answer

Option B

Solution

(b) In insects circulating body fluid (haemolymph) does not help in the circulation of respiratory gases.

Distribution of oxygen takes place through spiracles.

Q58

Adult human RBCs are enucleated. Which statement is most appropriate explanation for this feature?

A RBCs need nucleus to make haemoglobin

B Enucleation allows more space for haemoglobin

C Nucleus maintains RBC shape

D Enucleation increases RBC lifespan

Correct Answer

Option D

Solution

(d) In human RBCs, nucleus degenerates during maturation providing more space for oxygen carrying pigment (haemoglobin).

Q59

A drop of each of the following, is placed separately on four slides. Which of them will not coagulate?

A Blood serum

B Sample from the thoracic duct of lymphatic system

C Whole blood from pulmonary vein

D Blood plasma.

Correct Answer

Option A

Solution

(a) Blood serum does not have fibrinogen and other clotting materials therefore it does not take part in blood clotting.

Q60

The haemoglobin of a human foetus

A has a lower affinity for oxygen than that of the adult.

B has affinity for oxygen is the same as that of an adult.

C has only 2 protein subunits instead of 4.

D has a higher affinity for oxygen than that of an adult.

Correct Answer

Option D

Solution

(d) Foetal haemoglobin binds to oxygen more strongly than adult haemoglobin.

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