Tag: biology

Questions Related to biology

Amount of blood which can be stored in spleen is

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

  1. 200 ml

  2. 100 ml

  3. 50 ml

  4. None of the above

Show answer
Correct Option: A
Explanation:
The spleen is the largest lymphoid organ which is located under the ribcage and above the stomach in the abdomen. On an average, an adult human body contains 5.6 liters of blood out of which nearly 200ml blood can be stored in the spleen and released in cases of hypovolemia(low blood volume) and hypoxia (low oxygen levels). 
So, the correct answer is ' 200ml '.

Choose the correct answer from the alternatives given.
The cells constituting walls of blood capillaries are known as:

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

  1. endothelial cells

  2. cords

  3. oxyntic cells

  4. plasma cells

Show answer
Correct Option: A
Explanation:

The endothelial cells form a one-cell-thick walled layer called endothelium that lines all of our blood vessels such as arteries, arterioles, venules, veins, and capillaries. Smooth muscle cells layer beneath the endothelial cells. 

The primary function of endothelium is the maintenance of vessel wall permeability and regulating blood flow. 
So, the correct option is 'Endothelial cells'.

Cords of billroth are found in

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

  1. Liver

  2. Kidneys

  3. Spleen

  4. Tonsils

Show answer
Correct Option: C
Explanation:

The Cords of Billroth (also known as splenic cords or red pulp cords) are found in the red pulp of the spleen between the sinusoids, consisting of fibrils and connective tissue cells with a large population of monocytes and macrophages. These cords contain half of the human body's monocytes as a reserve so that after tissue injury these monocytes can move in and aid locally sourced monocytes in wound healing.

Splenic artery arises from 

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

  1. Anterior mesenteric artery

  2. Coeliac artery

  3. Posterior mesenteric artery

  4. Intestinal artery

Show answer
Correct Option: B
Explanation:

The splenic artery supplying the organ spleen is the branch of the coeliac artery which itself is a branch of the abdominal aorta. The abdominal aorta is a branch of dorsal aorta/systemic aorta.

Dorsal aorta > Abdominal segmental aorta > Coeliac artery > Splenic artery.
So, the correct answer to the question is 'Coeliac artery'.

Solid substances constitute ____ % of the non-cellular part of lymph.

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

  1. $34$%

  2. $6$%

  3. $12$%

  4. $82$%

Show answer
Correct Option: B
Explanation:

Non-cellular part; water - 94%
Solids (proteins, fats, carbohydrates, enzymes, antibodies etc) - 6%.

Choose the correct answer from the alternatives given.
The lymph consists of:

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

  1. plasma

  2. leucocytes

  3. plasma and leucocytes

  4. plasma and erythrocytes

Show answer
Correct Option: C
Explanation:

  • Lymph is a fluid which flows through the lymphatic system of the body and takes part in transportation. Lymph is formed by the seepage of blood plasma, proteins, and few blood cells through the pores of capillaries.
  • Lymph transports protein, fats and other nutrients from the digestive system. Lymph also collects bacteria and other pathogens from the bloodstream and brings to the lymph nodes to destroy them. Lymph mainly contains blood plasma with some white blood cells.
So, the correct option is 'Plasma and leucocytes'.

Which is NOT the function of lymph?

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

  1. Transport R.B.C.s

  2. Drain excess tissue fluid

  3. Transport lymphocyte and antibodies

  4. Transport absorbed fat

Show answer
Correct Option: A

Good crop management involves _______ before distribution

biology improvement in food resources improved methods of agriculture cropping patterns food for all

  1. Storage of grains

  2. Production of grains

  3. Applying coat layer

  4. None of these

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Correct Option: A

Identify the advantage of proper storage.

biology improvement in food resources improved methods of agriculture cropping patterns food for all

  1. The quality of food is ensured for a longer time.

  2. The variety of food may be available in far places.

  3. The food poisoning is prevented.

  4. All of the above

Show answer
Correct Option: D
Explanation:
Proper storage of food helps in maintaining food quality by retaining flavor, colour, texture and nutrients, while reducing the chance of contracting a food-borne illness. It has various advantages as the quality of food remain intact therefore it can be used for longer time, it can be made available at far places where such food is not harvested and since it remains unaffected by microbes, food poisoning can be prevented.
So, the correct answer is option D.

Assertion : Storage of seeds at low temperature is possible.

Reason : Respiration and enzymatic activity are not shown by seeds at low temperature.

biology improvement in food resources improved methods of agriculture cropping patterns food for all

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true

Show answer
Correct Option: C
Explanation:

Some seeds are capable of withstanding exposure to low temperature (-10C to -20C). Some of properly dried seeds can withstand low temperature of even liquid nitrogen (- 196C). This reduces respiration and enzymatic activity to bare minimum which is required for sustaining the living of the seeds. Samples of the seeds are periodically tested for germination ability.

So, the correct answer is 'If the assertion is true but the reason is false'