A. Increases transpiration by increasing the surface area of the leave.
B. Small and thick leaves to decrease the surface area proportional to the volume of the leave.
C. Stomata closing in sufficient supply, and opening in restricted supply of water.
D. None of these
Biology
The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called……..?
A. Homeostasis
B. Hemostasis
C. Osmoregualtion
D. Thermoregulation
Fishes, most of the invertebrates and amphibians are examples of …….. animals?
A. Endotherms
B. Ectotherms
C. Heterotherms
D. Homeotherms
Formation of heat shock proteins in plants results in………..?
A. Elevation of temperature in cold conditions.
B. Embracing the enzymes and other proteins and prevent their denaturation.
C. Change the chemical nature of other proteins thus making them heat resistant.
D. Help in evaporative cooling.
Panting is a representative of which mechanism?
A. Pigmentation.
B. Respiration.
C. Evaporative cooling.
D. Excretion.
Brown fat present in certain mammals is specialized in………..?
A. Providing insulation in cold environment.
B. Providing insulation in hot environment
C. Rapid heat production.
D. Controlling heat production.
It has been estimated that in a normal person plasma constitutes about …….. by volume of blood.
A. 35%
B. 45%
C. 55%
D. 75%
Which of the following is true about hearts of earthworm?
A. There are 5-7 pairs of heart.
B. They are present between 1-7th segments.
C. They are present lateral to the oesophagus.
D. They pump blood from ventral to dorsal vessel.
Stomata open due to ……… of K+ into the guard cells from the surrounding epidermis
A. Diffusion
B. Active transport
C. Osmosis
D. All of these
Single circuit heart is found in………?
A. Fishes
B. Amphibians
C. Reptiles
D. Mammals