Tag: zoology

Questions Related to zoology

The letter T in T-lymphocyte refers to :

zoology plants and animal hormones thymus thymus gland pineal gland and thymus

  1. Thymus

  2. Thyroid

  3. Thalamus

  4. Tonsil

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Correct Option: A

Which of the following glands is lost as the age advances?

zoology plants and animal hormones thymus thymus gland pineal gland and thymus

  1. Thyroid

  2. Thymus

  3. Pancreas

  4. Adrenal

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Correct Option: B
Explanation:

Thymus glands is a specialised lymphoid organ of the immune system. It helps in the maturation of the T cells. it plays an important role during the puberty at the adolescence stage.  After puberty, it degenerates and it is replaced by fat. This shrinkage of thymus mainly takes place due to a high level of sex hormones.

So, the correct answer is option B.

The name of endocrine gland in the human brain is

zoology plants and animal hormones thymus thymus gland pineal gland and thymus

  1. Thyroid

  2. Adrenal

  3. Thymus

  4. Pituitary

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Correct Option: D
Explanation:
Endocrine glands are group of secretory cells surrounded by an extensive network of capillaries that facilitates diffusion of hormones into the bloodstream. These glands include Pituitary gland, Pineal body, thymus, thyroid, parathyroid, adrenal glands, etc.
Thyroid gland is situated in the neck in front of the larynx and trachea at the level of 5th, 6th and 7th cervical and 1st thoracic vertebrae. The two adrenal glands are situated on the upper pole of each kidney enclosed within the renal fascia. The thymus is a soft gland located behind the breastbone and between the lungs. The pituitary gland is a pea sized structure located at the base of the brain, just below the hypothalamus.
So, the answer is D.

Which of the following do not play any role in calcium balance in the human body?

zoology plants and animal hormones thymus thymus gland pineal gland and thymus

  1. Vitamin D

  2. Parathyroid hormone

  3. Thyrocalcitonin

  4. Thymosin

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Correct Option: D
Explanation:
Thymosin is a hormone released by the thymus. It has a major role in the maturation of the T lymphocytes. It has no role in maintaining the calcium balance in the body.
Thus, the correct answer is 'Thymosin.'

Which gland atrophies in adults?

zoology plants and animal hormones thymus thymus gland pineal gland and thymus

  1. Pancreas gland

  2. Thymus gland

  3. Adrenal gland

  4. Thyroid gland

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Correct Option: B
Explanation:

Thymus gland is a prominent gland at birth but gradually atrophies in the adult. It is a soft, pinkish, bilobed mass of lymphoid tissue. It secretes a hormone thymosin which is involved in producing immunity.

Which one of the following is termed temporary gland?

zoology plants and animal hormones thymus thymus gland pineal gland and thymus

  1. Pineal

  2. Thymus

  3. Pancreas

  4. Kidney

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Correct Option: B
Explanation:

Thymus is called temporary gland as it degenerates in old individuals resulting in a decreased production of thymosin.

The regression in size of which organ is associated with reduction in the power of defence against invasion by pathogens with ageing?

zoology plants and animal hormones thymus thymus gland pineal gland and thymus

  1. Bone marrow

  2. Thymus

  3. Spleen

  4. Peyer's patches

Show answer
Correct Option: B
Explanation:

The thymus gland, located behind our sternum and between our lungs, is only active until puberty.

After puberty, the thymus starts to slowly shrink and become replaced by fat.
So, the correct option is 'Thymus'.

Central tolerance takes place in

zoology plants and animal hormones thymus thymus gland pineal gland and thymus

  1. Lymph nodes

  2. Thymus

  3. Spleen

  4. Liver

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Correct Option: B
Explanation:

Central tolerance is the tolerance established by deleting autoreactive lymphocyte clones before they develop into fully grown immunocompetent cells. It occurs primarily in the thymus.

So, the correct option is 'Thymus'.

Which one of these does not pertain to B-cells?

zoology plants and animal hormones thymus thymus gland pineal gland and thymus

  1. Have passed through the thymus

  2. Synthesize and liberate antibodies

  3. Have antibody-mediated immunity

  4. Have specific receptors

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Correct Option: A
Explanation:

B cells develop in the bone marrow but achieve maturity in peripheral lymphoid organs. Developmental stages are defined by the successful expression of heavy-chain and light-chain immunoglobulin genes. B cells provide humoral immunity against extracellular pathogens through antibody production. Antibodies neutralize pathogens and toxins, facilitate opsonization, and activate complement. The B-cell receptor or BCR is composed of immunoglobulin molecules that form a type 1 transmembrane receptor protein usually located on the outer surface of a lymphocyte type known as B cells. 


So, the correct option is 'Option A'.

The most common cancer of men in India is

zoology health, disease and yoga diabetes mellitus lifestyle diseases non-infectious diseases

  1. Lung cancer

  2. Throat cancer

  3. Mouth-throat cancer

  4. None of the above

Show answer
Correct Option: C
Explanation:

Mouth cancer is the oral cancer and is any cancerous tissue growth located in the oral cavity. Chewing Betel and Areca is known to be a strong risk factor for developing oral cancer. In India, these practices are common and so, oral cancer represents upto 40% of all cancers. Mouth and throat cancer is twice as common in men as in women.
Thus, the correct answer is option (C), 'Mouth-throat cancer'.