Practice Pakistan's most useful MCQs for competitive exams

In Anaerobic respiration only __________ % of the energy present within the chemical bond of glucose is converted into ATP?

• (A)  1%
• (B)  2%
• (C)  3%
• (D)  4%

Answer

Submitted By :Ali Uppal

Final acceptor of electrons in respiratory chain is____________?

• (A)  NADH
• (B)  Cytochrome a3
• (C)  Water
• (D)  Oxygen

Answer

Submitted By :Ali Uppal

In which of the following component of the body, lactic acid fermentation takes place?

• (A)  Brain
• (B)  Heart
• (C)  Liver
• (D)  Muscles

Answer

Submitted By :Ali Uppal

The most important photosynthetic pigment is ___________?

• (A)  Chlorophyll a
• (B)  Chlorophyll b
• (C)  Xanthophyll
• (D)  Carotenes

Answer

Submitted By :Ali Uppal

The chlorophyll molecule is embedded in the core of thylakoid membrane which acts as___________?

• (A)  Hydrophilic
• (B)  Hydrophobic
• (C)  Both of these
• (D)  None of these

Answer

Submitted By :Ali Uppal

In alcoholic fermentation Pyruvic acid is broken down into?

• (A)  Acetaldehyde
• (B)  Methyl alcohol
• (C)  Ethyl alcohol
• (D)  Lactic acid

Answer

Submitted By :Ali Uppal

Deficiency of ___________ causes yellowing in plants?

• (A)  Magnesium
• (B)  Iron
• (C)  Chlorine
• (D)  Oxygen

Answer

Submitted By :Ali Uppal

Chlorophylls mainly absorb _________ wavelengths?

• (A)  Orange – blue
• (B)  Violet – red
• (C)  Yellow – orange
• (D)  Orange – red.

Answer

Submitted By :Ali Uppal

Complete breakdown of glucose molecule takes place in which of the following?

• (A)  Alcoholic fermentation
• (B)  Lactic acid fermentation
• (C)  Aerobic respiration
• (D)  All of these

Answer

Submitted By :Ali Uppal

Of the following, which one is better respiratory medium___________?

• (A)  Air
• (B)  Water
• (C)  Soil
• (D)  None of these

Answer

Submitted By :Ali Uppal