Biology MCQs

A. Homeostasis
B. Hemostasis
C. Osmoregualtion
D. Thermoregulation

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

A. Osmoconformers
B. Osmoregulators
C. Both depend upon the concentration of sea water
D. None of these

A. 35%
B. 45%
C. 55%
D. 75%

A. Providing insulation in cold environment.
B. Providing insulation in hot environment
C. Rapid heat production.
D. Controlling heat production.

A. Pigmentation.
B. Respiration.
C. Evaporative cooling.
D. Excretion.

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.

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.

A. Pinnularia, navicula, cymbella, melosira
B. Euglenamorpha, hedneria , heteronema, colacium
C. Nostoc, anabaena, aulosira, cylindrospermum
D. Cochlodinium, gymnodinium, lenodinium, peridinium

A. Phytoplanktonic population
B. Freshwater lakes and ponds
C. Marine environment
D. All of the above