Tag: evs

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Questions Related to evs

Multiple choice evs solar energy fuels and fossil fuels solar energy and its applications electric energy generation and environment

Which of the following energy source is most costly?

  1. Thermal Energy

  2. Hydel Energy

  3. Solar Energy

  4. Fossil Energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Harnessing hydel power / energy is very costly procedure due to construction of large dams across the streams, clearance of vegetation for the development of the project, rehabilitation of the people living nearby the water bodies.

Multiple choice evs transportation in animal and plants blood in humans circulatory system - blood basics of blood and heart

Consider the following statements (A - C) each with one or two blanks.
(A)(1) are the most abundant cells (60-65 per cent) of the total WBCs and (2) are the least (0.5-1 per cent) among them.
(B)Platelets are cell fragments produced from (3).
(C)During clot formation, fibrins are formed by the conversion of inactive (4) in the plasma by the enzyme (5).
Which one of the following options, gives the correct fill ups for the respective blank numbers from (1) to (5) in the statements?

  1. (l)-Neutrophils, (2)-basophiIs, (4)-fibrinogens, (5)-thrombin

  2. (3)-mast cells, (4)-throm bo kinase, (5)prothrombin

  3. (3)-megakaryocytes, (4) prothrombin, (5)thrombin

  4. (1)-Basophils, (2)-neutrophils, (3)-reticulocytes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Out of all other leucocytes, the neutrophils (60-65%) are most abundant and the least are basophils (0.5-1%). Platelets are cell fragments produced from megakaryocytes. During the blood clotting, the enzyme thrombin converts inactive fibrinogens into active fibrins.. 

Thus, the correct answer is '(l)-Neutrophils, (2)-basophiIs, (4)-fibrinogens, (5)-thrombin).'

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Which of the following statements is true about RBCs in humans?

  1. They carry about 20-25 per cent of $CO _{2}$.
  2. They transport 99.5 per cent of $O _{2}$.

  3. They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood-plasma.
  4. They do not carry $CO _{2}$ at all.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nearly 20-25% of $CO _{2}$ is transported by RBCs whereas 70% of it is carried as bicarbonate in plasma. About 7% of $CO _{2}$ is carried in a dissolved state through plasma. About 97% of $O _{2}$ is carried by RBCs in the blood. About 3% of $O _{2}$ Is transported in a dissolved state through the plasma.

So, the correct answer is 'They carry about 20-25 per cent of 
CO2CO2'

Multiple choice evs transportation in animal and plants blood in humans circulatory system - blood basics of blood and heart

Which of the following cells gets activated during bleeding?

  1. RBC

  2. WBC

  3. Platelets

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
If one of your blood vessels gets damaged(bleeding), it sends out signals to the platelets. The platelets then rush to the site of damage. they form a plug (clot) to fix the damage. The process of spreading across the surface of a damaged blood vessel to stop bleeding is called adhesion. This is because when platelets get to the site of the injury, they grow sticky tentacles that help them stick (adhere) to one another. They also send out chemical signals to attract more platelets. The additional platelets pile onto the clot in a process called aggregation.

So, the correct answer is 'Platelets'.
Multiple choice evs transportation in animal and plants blood in humans circulatory system - blood basics of blood and heart

Platelets helps in 

  1. Transport of gases

  2. Clotting

  3. Fight against disease

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
When an injury or a trauma occurs platelets are exposed to air this phenomenon stimulates the platelets to start the clotting process. These platelets react with the protein called fibrinogen with the help of vitamin k and calcium. Fibrinogen forms a mesh of tiny threads that collects red blood cells, which plug the open blood vessels as it dries. This is called a clot. Hence platelets help in clotting.
So, the correct answer is 'Clotting'.
Multiple choice evs transportation in animal and plants blood in humans circulatory system - blood basics of blood and heart

Loss of haemoglobin can be controlled by

  1. Platelets

  2. RBC

  3. WBC

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

Platelets are cell fragments produced from megakaryocytes (special cells in the bone marrow). They are also called as thrombocytes. An injury or a trauma stimulates the platelets in the blood to release certain factors which activate the mechanism of coagulation or blood clotting. They also change their shape from round to spiny and stick to the broken vessel wall and each other and forms net-like structure during bleeding. This prevents the loss of hemoglobin through bleeding.

So, the correct answer is 'Platelets'.