Practice Pakistan's most useful MCQs for competitive exams

Reduction in photosynthesis is of____________?

• (A)  O2
• (B)  CO2
• (C)  H2O
• (D)  light energy

Answer

Submitted By :Ali Uppal

Which of the following pigment is Blue- green in colour?

• (A)  Chlorophyll a
• (B)  Chlorophyll b.
• (C)  Chlorophyll c
• (D)  Chlorophyll d.

Answer

Submitted By :Ali Uppal

Stomata cover only ______________ of leaf surface?

• (A)  0.03 – 0.04%
• (B)  10%
• (C)  1-2 %
• (D)  50%

Answer

Submitted By :Ali Uppal

Molecular formula of chlorophyll ‘a’ molecule is___________?

• (A)  C55H72O5N4Mg
• (B)  C55H70O6N4Mg
• (C)  C50H72O6N4Mg
• (D)  C55H70O5N4Mg

Answer

Submitted By :Ali Uppal

Photosynthesis carried out by terrestrial plants is _________ of total photosynthesis?

• (A)  1-2%
• (B)  5%
• (C)  10%
• (D)  20%

Answer

Submitted By :Ali Uppal

Which of the following statement about the head of a chlorophyll molecule is incorrect?

• (A)  It is a porphyrin ring or tetrapyrrole ring structure
• (B)  It is flat, square and light absorbing
• (C)  Composed of carbon and nitrogen atoms with Magnesium as central metal ion, which is coordinated with nitrogen.
• (D)  It is hydrophobic

Answer

Submitted By :Ali Uppal

Of the following, which one causes higher production of food in green plants?

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

Answer

Submitted By :Ali Uppal

Chlorophyll is insoluble in_____________?

• (A)  Carbon tetrachloride
• (B)  Alcohol
• (C)  Organic solvents
• (D)  Water

Answer

Submitted By :Ali Uppal

First Actions spectrum was obtained by using__________?

• (A)  Algae
• (B)  Fungi
• (C)  Bacteria
• (D)  Spirogyra

Answer

Submitted By :Ali Uppal

Which of the light is mainly absorbed by the plants?

• (A)  Orange
• (B)  Red
• (C)  Green
• (D)  Both A and B

Answer

Submitted By :Ali Uppal