Body Fluids and Circulation — Page 7 | NEET Biology

Q61

The most active phagocytic white blood cells are:

A neutrophils and eosinophils

B lymphocytes and macrophages

C eosinophils and lymphocytes

D neutrophils and monocytes

Correct Answer

Option D

Solution

(d) Neutrophils and monocytes are the most active phagocytic white blood cells.

Q62

Which type of white blood cells are concerned with the release of histamine and the natural anti-coagulant heparin?

A Neutrophils

B Basophils

C Eosinophils

D Monocytes

Correct Answer

Option B

Solution

(b) Basophils produce histamine and heparin as part of the body's defences.

Q63

Globulins contained in human blood plasma are primarily involved in :

A osmotic balance of body fluids.

B oxygen transport in the blood.

C clotting of blood.

D defence mechanisms of body.

Correct Answer

Option D

Solution

(d) Globulins are primarily involved in defence mechanism of body.

Q64

There is no DNA in:

A mature RBCs

B a mature spermatozoan

C hair root

D an enucleated ovum

Correct Answer

Option A

Solution

(a) Mature RBCs have no nucleus and therefore no DNA.

Q65

Compared to blood our lymph has:

A plasma without proteins

B more WBCs and no RBCs

C more RBCs and less WBCs

D no plasma

Correct Answer

Option B

Solution

(b) Lymph contains white blood cells but lacks RBCs and large plasma proteins.

Q66

The most popularly known blood grouping is the ABO grouping. O refers to having:

A overdominance of this type on the genes for A and B types.

B one antibody only - either anti-A or anti-B on the RBC.

C no antigens A and B on RBCs.

D other antigens besides A and B on RBCs.

Correct Answer

Option C

Solution

(c) Blood group O individuals do not have either A or B antigens on the surface of their RBCs.

Q67

What is true about RBCs in humans?

A They carry about 20-25 per cent of CO2.

B They transport 99.5 per cent of O2.

C They transport about 80 per cent oxygen only and the rest 20 per cent dissolved in blood plasma.

D They do not carry CO2 at all.

Correct Answer

Option A

Solution

(a) About 97% of oxygen is transported by RBCs. Nearly 20-25% of carbon dioxide is transported by RBCs.

Q68

ABO blood groups in humans are controlled by the gene I. It has three alleles. How many phenotypes can occur?

A Three

B One

C Four

D Two

Correct Answer

Option C

Solution

(c) Three alleles in ABO blood groups produce six different genotypes and four different phenotypes: A, B, AB, O.

Q69

Match the following columns and select the correct option.

A (iv) (i) (ii) (iii)

B (i) (ii) (iv) (iii)

C (ii) (i) (iii) (iv)

D (iii) (iv) (ii) (i)

Correct Answer

Option D

Solution

(d) Eosinophils associated with allergic reactions; Basophils secrete histamine; Neutrophils are phagocytic; Lymphocytes responsible for immune responses.

Q70

Bundle of His is a network of

A nerve fibres found throughout the heart

B muscle fibres distributed throughout the heart walls

C muscle fibres found only in the ventricular wall

D nerve fibres distributed in ventricles

Correct Answer

Option C

Solution

(c) Bundle of His are specialised heart muscle cells that transmit electrical impulses from the AV node to the ventricular muscle.