Practice Pakistan's most useful MCQs for competitive exams

The first action spectrum was obtained by___________?

• (A)  T.W.Englemam
• (B)  Malleus
• (C)  T.W.Inws
• (D)  W.Stapes

Answer

Submitted By :Ali Uppal

Which of the following light is least absorbed by the plants?

• (A)  Orange
• (B)  Red
• (C)  Blue
• (D)  Green

Answer

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The percentage of light absorbed by the leaf is ___________?

• (A)  20%
• (B)  15%
• (C)  10%
• (D)  1%

Answer

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Visible light used in photosynthesis ranges from:__________?

• (A)  300 – 700 nm in wavelength
• (B)  350 – 750 nm in wavelength
• (C)  380 – 750 nm in wavelength
• (D)  390 – 790 nm in wavelength.

Answer

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PS I has chlorophyll a molecule which absorbs maximum light of _________ nm ?

• (A)  600
• (B)  650
• (C)  680
• (D)  700

Answer

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Van neil hypothesis about the production of oxygen during phosynthesis was based on the study and investigations on___________?

• (A)  Bacteria
• (B)  Algae
• (C)  Protenema
• (D)  Cyanobacteria

Answer

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Air contains __________ % of CO2 ?

• (A)  0.02-0.03
• (B)  0.03-0.04
• (C)  0.04-0.05
• (D)  0.05-0.06

Answer

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The point at which there is no net exchange of gases between leaves and atmosphere is known as_____________?

• (A)  Neutral point
• (B)  Compensation point
• (C)  Parallel point
• (D)  Competitive point

Answer

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Net yield of H2O in Photosynthesis is__________?

• (A)  1 molecule
• (B)  6 molecules
• (C)  3 molecules
• (D)  0 molecule

Answer

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About __________ % of photosynthesis is carried by terrestrial plants, while rest occurs in ocean, lakes, and ponds?

• (A)  10%
• (B)  20%
• (C)  30%
• (D)  40%

Answer

Submitted By :Ali Uppal