Tag: zoology

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Multiple choice zoology immunity cells of immune system cells in immune system lymphocytes and lymph

Formation of antibodies is the function of

  1. Monocytes

  2. Neutrophils

  3. Basophils

  4. Lymphocytes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lymphocytes are of two major types, ‘B’ and ‘T’ forms. When B lymphocytes recognize foreign antigen they release antibodies. The B cells are known as plasma cells. Hence the formation of antibodies is the function of lymphocytes.

So, the correct answer is 'Lymphocytes'.

Multiple choice zoology immunity cells of immune system cells in immune system lymphocytes and lymph

Choose correct alternative in the following statements:
Function of WBCs is to

  1. Transport oxygen

  2. Help in clotting of blood

  3. Provide immunity

  4. Provide storage of food
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
White blood cells, also known as leucocytes are components of the formed elements of human blood. They are of two categories: agranulocytes and granulocytes. Their major function is to provide immunity.
So, the correct answer is, 'Provide immunity.'
Multiple choice zoology immunity cells of immune system cells in immune system lymphocytes and lymph

Identify a function of lymphocytes from the following.

  1. Destruction of poisonous substance

  2. Destruction of bacteria

  3. Destruction of RBC

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

White blood cells are an important part of the immune system. Lymphocytes are one of several different types of white blood cells. Lymphocytes are of two types B cells and T cells. When a macrophage engulfs bacteria B cells release antibodies which cause the destruction of bacteria. The T cells destroy the infectious bacteria by killing the body cells that are affected.

So, the correct answer is 'Destruction of bacteria'.

Multiple choice zoology immunity cells of immune system cells in immune system lymphocytes and lymph

Which of the following is a unit of immune system?

  1. Lymphocytes

  2. Erythrocyte

  3. Chondrocytes

  4. Parasite
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lymphocytes are one of several different types of white blood cells. Lymphocytes are of two types B cells and T cells. When a macrophage engulfs organisms, B cells (humoral immunity) release antibodies which cause the destruction of bacteria. The T cells (cell-mediated immunity) destroy the infectious organisms by killing the body cells that are affected. Hence lymphocytes is a unit of the immune system.

So, the correct answer is 'Lymphocytes'.

Multiple choice zoology immunity cells of immune system cells in immune system lymphocytes and lymph

A liquid P, light yellow in colour, circulates in the human body only in one direction (from body tissues to the heart). P contains germs from cells and dead cells. P is cleaned of germs and dead cells by a special type of white blood cells called as

  1. Lymphocytes

  2. Parasites

  3. Saprophytes

  4. Hermaphrodites
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The lymph fluid (P) inside the lymph nodes contains lymphocytes, a type of white blood cell, which continuously recirculates through the lymph nodes and the bloodstream. Molecules found on bacteria cell walls or chemical substances secreted from bacteria, called antigens, are taken up by antigen cells into the lymph system and then into lymph nodes. In response to the antigens, the lymphocytes in the lymph node make antibodies which will go out of the lymph node into circulation, target the pathogens producing the antigens by targeting them for destruction by other cells and complement.

Therefore, the correct answer is option A.

Multiple choice zoology immunity cells of immune system cells in immune system lymphocytes and lymph

Which of the following statements are wrong?
(i) Leucocytes disintegrate in the spleen and liver.
(ii) RBC, WBC and blood platelets are produced by bone marrow.
(iii) Neutrophils bring about destruction and detoxification of toxins of protein origin.
(iv) The important function of lymphocytes is to produce antibodies.

  1. (i) and (ii) only

  2. (i) and (iv) only

  3. (i) and (iii) only

  4. (ii) and (iii) only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The spleen acts to help keep the blood free of unwanted substances, including wastes and infecting organisms. The blood is delivered to it by the splenic artery and passes through smaller branch arteries into a network of channels lined with leukocytes, known as phagocytes. Red blood cells disintegrate in spleen. 

RBC, WBC and blood platelets are produced by hematopoietic stem cells present in bone marrow. 
Neutrophils are phagocytic cells that engulf the foreign particles. They are the first to reach the site of infection. 
B-lymphocytes produce antibodies against the infection or pathogen in human body. 

Multiple choice zoology immunity cells of immune system cells in immune system lymphocytes and lymph

Which of the following is not phagocytic?

  1. Neutrophils

  2. Monocytes

  3. Lymphocytes

  4. Eosinophils
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The blood cells are of three major types they are erythrocytes(RBC), leucocytes(WBC) and platelets. Two main categories of WBCs are granulocytes and agranulocytes. Neutrophils, eosinophils, and basophils are different types of granulocytes, while lymphocytes and monocytes are the agranulocytes.  Lymphocytes are of two major types – ‘B’ and ‘T’ forms. Both B and T lymphocytes are responsible for immune responses of the body.B lymphocytes are responsible for humoral immunity and T lymphocytes in cell-mediated immunity. Hence lymphocytes are not phagocytic.

So, the correct answer is 'Lymphocytes'.

Multiple choice zoology excretion to maintain homeostasis other excretory organ role of other organs in excretion accessory excretory organs excretion in other organisms

Which of the following waste can be removed by skin?

(i) Water (ii) Excessive mineral salts (iii) Urea

  1. (i) only

  2. (i), (ii), and (iii)

  3. (i), (iii)

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The skin acts as an excretory organ by releasing sweat, which contains water, excessive mineral salts, and small amounts of urea, helping to regulate body temperature and remove metabolic waste.

Multiple choice zoology excretion to maintain homeostasis other excretory organ role of other organs in excretion accessory excretory organs excretion in other organisms

Select the correct match

  1. Human- kidney, sebaceous glands, tear glands

  2. Earth worm- pharyngeal, integumentary, septal nephridia

  3. Cockroach- malphigian tubules, enteric caeca

  4. Frog- kidney, skin, buccal epithelium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A) In humans, kidney and sebaceous glands are excretory organs but tear glands play no role in excretion.
B) According to the position in the body, the nephridia of earthworm are divided into three types :
1) Pharyngeal nephridia
2) Integumentary nephridia
3) Septal nephridia.
C) In cockroach, the malpighian tubules are major excretory organs but enteric caeca play role in digestion by the release of digestive enzymes at the junction of foregut and midgut.
D) In the frog, Kidney plays part in excretion, while Skin and buccal epithelium play important role in the respiratory process.
So, the correct match is 'Earthworm - Pharyngeal, integumentary, septal nephridia'.