Lymph is a colourless vascular connective tissue derived from tissue fluid. RBCs and platelets are absent. Only leucocytes and floating amoeboid lymphocytes are present.

Correct Option: B

Lymph is a colourless vascular connective tissue derived from tissue fluid. RBCs and platelets are absent. Only leucocytes and floating amoeboid lymphocytes are present.

Leucocytes are colourless, nucleated amoeboid cells found in blood which are devoid of haemoglobin and are capable of coming out of blood capillaries through the process of diapedesis. Fall of WBC count is called leucopenia, and occurs due to folic acid deficiency and AIDS etc.

Correct Option: D

Leucocytes are colourless, nucleated amoeboid cells found in blood which are devoid of haemoglobin and are capable of coming out of blood capillaries through the process of diapedesis. Fall of WBC count is called leucopenia, and occurs due to folic acid deficiency and AIDS etc.

Blood group is determined by three alleles - I^A, I^B, and I^o. Alleles I^A and I^B are codominant. Blood group A is determined by I^A I^A or I^A I^o. Blood group B is I^B I^B or I^B I^o. Blood group O is I^o I^o. Blood group AB is I^A I^B.

Correct Option: C

Blood group is determined by three alleles - I^A, I^B, and I^o. Alleles I^A and I^B are codominant. Blood group A is determined by I^A I^A or I^A I^o. Blood group B is I^B I^B or I^B I^o. Blood group O is I^o I^o. Blood group AB is I^A I^B.

White blood cells are of two types:
(i) Granulocytes (with granular cytoplasm) - neutrophils, basophils and eosinophils.
(ii) Agranulocytes (with clear cytoplasm) - Lymphocytes and monocytes

Correct Option: A

White blood cells are of two types:
(i) Granulocytes (with granular cytoplasm) - neutrophils, basophils and eosinophils.
(ii) Agranulocytes (with clear cytoplasm) - Lymphocytes and monocytes

Most of the WBCs have a life span which is even less than 1 day. White blood cells or leukocytes are cells which form a component of the blood. They are produced in the bone marrow at a rate of about 1000 million per day and help to defend the body against infectious disease and foreign materials as part of the immune system.
There are normally between 4 × 10⁹ and 1.1 × 10¹⁰ white blood cells in a litre of healthy adult blood. In conditions such as leukemia this may rise to as many as 50,000 white blood cells in a single drop of blood (only 1% of blood on average is a white blood cell). As well as in the blood, white cells are also found in large numbers in the lymphatic system, the spleen, and in other body tissues. The white blood cells have a life span of 10 days.

Correct Option: A

Most of the WBCs have a life span which is even less than 1 day. White blood cells or leukocytes are cells which form a component of the blood. They are produced in the bone marrow at a rate of about 1000 million per day and help to defend the body against infectious disease and foreign materials as part of the immune system.
There are normally between 4 × 10⁹ and 1.1 × 10¹⁰ white blood cells in a litre of healthy adult blood. In conditions such as leukemia this may rise to as many as 50,000 white blood cells in a single drop of blood (only 1% of blood on average is a white blood cell). As well as in the blood, white cells are also found in large numbers in the lymphatic system, the spleen, and in other body tissues. The white blood cells have a life span of 10 days.