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21. In condition of high temperature, following does not occur or occurs at low level__________?

A. Vasodilation
B. Activation of sweat glands
C. Thermogenesis
D. Evaporative cooling

22. Who first observed and thus hypothesized that new cells are formed from previously existing living cell?

A. Theodor Schwann and Schleiden
B. Rudolph Virchows
C. Louis Pasteur
D. Both b and c

23. In Hardy-Weinberg formula P2 represents frequency of_____________?

A. Recessive allele
B. Dominant allele
C. Homozygous dominant individual
D. Homozygous recessive individual

24. _____________ supported theory of special creation?

A. Linnaeus
B. Aristotle
C. Mendel
D. Lamarck

25. Percentage of proteins in cell membrane is____________?

A. 20-40%
B. 40-50%
C. 60-80%
D. 80-100%

26. Which of the following is most constant abiotic component of ecosystem___________?

A. Air
B. Water
C. Land
D. Gravity

27. Ecosystem not found in Pakistan is_____________?

A. Tropical rain forest
B. Temperate deciduous forest
C. Grassland
D. Tundra

28. Movement of the material across the cell membrane which does not requiring expenditure of metabolic energy is called__________?

A. Active transport
B. Passive transport
C. Co-transport
D. Counter transport

29. The productivity of aquatic ecosystem is basically determined by light and____________?

A. CO2
B. O2
C. Water
D. Nutrients

30. The first layer of cell wall which is formed is___________?

A. Primary wall
B. Secondary wall
C. Middle lamella
D. All of these