Answer: Option C. -> Phloem
:
C
Translocation is the transport of soluble products of photosynthesis. It occurs in the part of the vascular tissue known as phloem. The phloem also transports amino acids and other substances. These substances are especially delivered to the storage regions of roots, fruits and seeds and to growing regions.

Answer: Option C. -> diffusion
:
C
Diffusion is the movement of a substance from an area of higher concentration to an area of lower concentration.The air in alveoli contains higher concentration of oxygen. The alveoli are very close to capillaries, which has low oxygen concentration and high carbon dioxide as compared to alveolar air. Oxygen diffuses from the alveoli, into the blood in the capillaries. Similarly, carbon dioxide from the blood moves out of the capillaries into the alveoli.

Answer: Option A. -> By movement of cilia
:
A
Paramecium uses cilia to sweep food particles along with some water into an oral groove (a groove present on the surface of paramecium). At the end of the oral groove, a food vacuole gets created. This food vacuole further travels throughout the cytoplasm and during this journey, the food inside the vacuole gets digested and absorbed.

Answer: Option B. -> A is correct and R is incorrect
:
B
Digestion of cellulose takes more time because the enzymes required for cellulose digestion are produced by the ruminant bacteria. These bacteria live in the gut of the herbivores and take time to completely breakdown the cellulose. Since, cellulose digestion takes time so the herbivores have a longer small intestine which ensures that the food stays in the intestine for a longer period of time for complete digestion.

Answer: Option B. -> Exchange of respiratory gases
:
B
Alveoli or air sacs are formed at the end of bronchioles. They provide a surface where the exchange of gases can take place. The walls of the alveoli contain an extensive network of blood vessels.The blood brings carbon dioxide from the rest of the body and releasesit into the alveoli. The oxygen in the alveolar air is taken up by the blood in the alveolar blood vessels and is transported to all cells in the body.

Answer: Option A. -> urea
:
A
Dialysis fluid contains all the constituents of the plasma except the nitrogenous wastes. Urea is the main nitrogenous waste of the body. In case of kidney failure, urea gets accumulated in the blood.

Answer: Option B. -> Inhibits CO₂  intake by the plant
:
B and C

KOH or potassium hydroxide is an absorbent of carbon dioxide. In the closed jar, the entire carbon dioxide is absorbed by KOH. Hence this does not allow production of food, as glucose is produced by the reduction of carbon dioxide during the process of photosynthesis.

Answer: Option C. -> Clotting of blood
:
C
Platelets are tiny blood cells that help stop bleeding by forming clots. At the time of injury, when any blood vessels get damaged, it sends out signals. These signals are received by platelets and they, along with fibrinogen, a protein present in plasma form a clot and heal the wound.

Answer: Option B. -> A is correct and R is incorrect
:
B
Digestion of cellulose takes more time because the enzymes required for cellulose digestion are produced by the ruminant bacteria. These bacteria live in the gut of the herbivores and take time to completely breakdown the cellulose. Since, cellulose digestion takes time so the herbivores have a longer small intestine which ensures that the food stays in the intestine for a longer period of time for complete digestion.

Answer: Option B. -> Exchange of respiratory gases
:
B

Alveoli or air sacs are formed at the end of bronchioles. They provide a surface where the exchange of gases can take place. The walls of the alveoli contain an extensive network of blood vessels. The blood brings carbon dioxide from the rest of the body and releases it into the alveoli. The oxygen in the alveolar air is taken up by the blood in the alveolar blood vessels and is transported to all cells in the body.