The osmotic expansion of a cell kept in water is chiefly regulated by:
Options
(a) Mitochondria (b) Vacuoles (c) Plastids (d) Ribosomes
Correct Answer:
Vacuoles
Explanation:
No explanation available. Be the first to […]
The first human hormone produced by recombinant DNA tecnology is:
Options
(a) Insulin (b) Estrogen (c) Thyroxin (d) Progesterone
Correct Answer:
Insulin
Explanation:
Mammalian hormones were among the first products prepared in bacteria by […]
Select the correct option Direction of RNA synthesis – Direction of reading of the template DNA strand
Options
(a) 5′ – 3′ 3′ – 5′ (b) 3′ – 5′ 5′ – 3′ (c) […]
Person with blood group AB is considered as universal recipient because he has:
Options
(a) both A and B antigens on RBC but no antibodies in the plasma. (b) both A and B […]
Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:
Options […]
If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain? plant → mice → snake → peacock
Options
Transpiration and root pressure cause water torise in plants by :
Options
(a) Pulling and pushing it, respectively (b) Pushing it upward (c) Pushing and pulling it, respectively (d) Pushing it upward
Correct Answer: […]
Roots play insignificant role in absorption of water in :
Options
(a) Pistia (b) Pea (c) Wheat (d) Sunflower
Correct Answer:
Pistia
Explanation:
Pistia a hydrophyte plant where absorption of water by root is […]
Root pressure develops due to :
Options
(a) Low osmotic potential in soil (b) Passive absorption (c) Increase in transpiration (d) Active absorption
Correct Answer:
Active absorption
Explanation:
Active absorption creates root pressure. In […]
A column of water within xylem vessels of tall trees does not break under its weight because of:
Options
(a) Tensile strength of water (b) Lignification of xylem vessels (c) Positive root pressure (d) […]
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