Tag: biology

Questions Related to biology

$CO _{2}$ is a tasteless, colorless and

biology windows of knowledge human tongue organ of taste tongue : the organ of taste

  1. Non-combustible gas

  2. Combustible gas

  3. Flammable Gas

  4. All of above

Show answer
Correct Option: A

The tongue of a person is exposed to a high salty taste then.

biology windows of knowledge human tongue organ of taste tongue : the organ of taste

  1. The person learns to taste salty things better

  2. Loves tasting salty things

  3. Hates tasting salty things

  4. Fails to taste a less salty things just after the exposure

Show answer
Correct Option: A

Identify the taste receptor of sweet taste.

biology windows of knowledge human tongue organ of taste tongue : the organ of taste

  1. ENaC

  2. T2Rs

  3. PCKD channel

  4. T1R2 + T1R3

Show answer
Correct Option: D
Explanation:
  • The upper surface of the tongue has small projections called papillae, some of which bear taste buds.
  • About 50 -150 taste cells are found in a taste bud. These cells detect all 4 tastes i.e sweet, sour, salty and bitter
  • The taste buds for "sweet" are on the tip of the tongue and have sweet receptors such as T1R2 + T1R3. These receptors have the ability to sense sweet taste and send signals to the brain.
  • So, the correct answer is 'T1R2 + T1R3.'.

Loss of the sensation of taste is referred to as ____

biology windows of knowledge human tongue organ of taste tongue : the organ of taste

  1. Dysosmia

  2. Ageusia

  3. Hypogeusia

  4. Asnosmia

Show answer
Correct Option: B
Explanation:

Ageusia refers to the lost ability of tongue to taste, particularly the inability to detect sweetness, sourness, bitterness, saltiness, and umami (meaning "pleasant/savory taste"). It is sometimes confused with anosmia a loss of the sense of smell. 

Most of our cells are surrounded by- 

biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

  1. Blood

  2. Fluid equivalent to seawater in salt composition

  3. Interstitial fluid

  4. Pure water

Show answer
Correct Option: C
Explanation:
It is the main component of the extracellular fluid and transcellular fluid. The interstitial fluid is found in the spaces between cells or the tissue spaces.It consists of a water solvent containing sugars, salts, fatty acids, amino acids, coenzymes, hormones, neurotransmitters, white blood cells and waste products from the cell.The composition of tissue fluid depends upon the exchanges between the cells in the biological tissue and the blood. 
So, the correct answer is Interstitial Fluid."

Which of the following statements is/are incorrect about lymph?
(i)Lymph is colourful as it has haemoglobin but no RBC.
(ii)It contains specialised lymphocytes which are responsible for immunity of the body.
(iii)Lymph is an important carrier for nutrients and hormones.
(iv)Fats are absorbed through lymph in the lacteals present in the intestinal villi.

biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

  1. i only

  2. iii and iv

  3. ii and iii

  4. iv only

Show answer
Correct Option: A
Explanation:

Lymph is colourless as it does not contain RBC, in higher animals the respiratory pigment haemoglobin is contained only in the RBC and does not occur dispersed in body fluids. Therefore, statement i is wrong.

So, the correct answer is 'i only'

Compared to blood our lymph has

biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

  1. Plasma without proteins

  2. More WBCs and no RBCs

  3. More RBCs and less WBCs

  4. No plasma.

Show answer
Correct Option: B
Explanation:

Lymph consists of proteins- albumin, fibrinogen etc, nitrogenous waste, WBCs, lymphocytes, carbohydrates, fats and 94% water. It does not contain RBCs that are found in abundance in blood and platelets.

So, the correct answer is 'More WBCs and no RBCs'

The lymph serves to

biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

  1. Return the interstitial fluid to the blood

  2. Return the WBCs and RBCs to the lymph nodes

  3. Transport $CO _2$ to the lungs

  4. Transport $O _2$ to the brain

Show answer
Correct Option: A
Explanation:

Lymph is in contact with the cells/tissues of the organs as interstitial fluid, this fluid is drained in the lymphatic vessels, that connects to the venous system. In this manner interstitial fluid is returned to the blood.

So, the correct answer is 'Return the interstitial fluid to the blood'

Which of the following statements is true for lymph?

biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

  1. WBCs + serum

  2. Blood - RBCs and some proteins

  3. RBCs + WBCs + plasma

  4. RBCs + proteins + platelets

Show answer
Correct Option: A
Explanation:

Lymph has a pale yellow colour due to absence of RBCs and platelets,  it has abundance of WBCs, Lymphocytes, carbohydrates, proteins, fats and nitrogenous waste.

So, the correct answer is 'WBCs + serum'

In the human circulation, the lymph

biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

  1. Transports oxygen to brain

  2. Transports $CO _2$ to lungs

  3. Returns interstitial fluid back to heart

  4. Contains RBCs, leucocyte, and more protein as compared to blood

Show answer
Correct Option: C
Explanation:

Lymphatic system is a network present throughout all tissues in the body. It removes wastes, bacteria and excess water from the tissue fluid. The fluid present in the lymphatic vessels is called as lymph. In lymph, escaped blood cells and proteins are collected and returned back to the heart in the form of interstitial fluid. Interstitial fluid is a fluid that bathes the cells of multicellular animals.

Thus, the correct answer is 'Returns interstitial fluid back to heart.'