Practice Pakistan's most useful MCQs for competitive exams

How many spiracles are present in cockroach_____________?

• (A)  5
• (B)  10
• (C)  20
• (D)  40

Answer

Submitted By :Ali Uppal

Salivary glands present in front of ear are___________?

• (A)  Sublingual
• (B)  Submaxillary
• (C)  Submandibular
• (D)  Parotid

Answer

Submitted By :Ali Uppal

NADH is oxidized by___________?

• (A)  Coenzyme ?
• (B)  Cytochrome b
• (C)  Oxygen
• (D)  Glycolysis

Answer

Submitted By :Ali Uppal

The arrangement of _________ speaks of the division of labour within cell?

• (A)  Molecule
• (B)  Subatomic particles
• (C)  Atoms
• (D)  Organelles

Answer

Submitted By :Ali Uppal

Ozone depletion occurs commonly due to_______________?

• (A)  Carbon dioxide
• (B)  Chlorofluorocarbons
• (C)  UV rays
• (D)  Deforestation

Answer

Submitted By :Ali Uppal

Deoxygenated blood first enters in _________ part in fishes?

• (A)  Sinus venosus
• (B)  Right atrium
• (C)  Left atrium
• (D)  Conus arteriosus

Answer

Submitted By :Ali Uppal

According to cohesion-tension theory, tension is created by__________________?

• (A)  Hydrogen bonding
• (B)  Transpiration
• (C)  Adhesion
• (D)  Root prerssure

Answer

Submitted By :Ali Uppal

Cuticular transpiration is _____________ of total transpiration?

• (A)  1-2%
• (B)  3-4%
• (C)  5-7%
• (D)  90%

Answer

Submitted By :Ali Uppal

An infectious disorder of respiratory system is_________________?

• (A)  Cancer
• (B)  Asthma
• (C)  Tuberculosis
• (D)  Emphysema

Answer

Submitted By :Ali Uppal

_________________ cells of phloem are directly involved in transport of organic solutes?

• (A)  Parenchyma
• (B)  Companion cell
• (C)  Tracheid
• (D)  Sieve element

Answer

Submitted By :Ali Uppal