Practice Pakistan's most useful MCQs for competitive exams

Lenticels look like__________?

• (A)  A big pore
• (B)  Stoma
• (C)  Sponge
• (D)  Cars or small protusions

Answer

Submitted By :Ali Uppal

Aerating openings formed in the bark through which exchange of gases takes place and water is lost in the form of vapours are___________?

• (A)  Hydathods
• (B)  Stomata
• (C)  Lenticels
• (D)  None of these

Answer

Submitted By :Ali Uppal

Which of the following are proteins in nature?

• (A)  Antibodies.
• (B)  Interferons
• (C)  Antitoxins
• (D)  All of these

Answer

Submitted By :Ali Uppal

Cooley’s anemia is another name used for___________?

• (A)  Leucemia
• (B)  Thalassaemia
• (C)  Sickle cell anemia
• (D)  None of these

Answer

Submitted By :Ali Uppal

Tricuspid valve is present_____________?

• (A)  Between right atrium and right ventricle
• (B)  Between left atrium and left ventricle
• (C)  At base of pulmonary artery
• (D)  At base of aorta

Answer

Submitted By :Ali Uppal

Single circuit heart is found in_________?

• (A)  Fishes
• (B)  Amphibians
• (C)  Reptiles
• (D)  Mammals

Answer

Submitted By :Ali Uppal

Addition of salts and other solutes from other cells into xylem sap, __________ the water potential of the xylem sap

• (A)  Increases.
• (B)  Lowers.
• (C)  Doesn’t effect.
• (D)  Maintains.

Answer

Submitted By :Ali Uppal

Symbionts which help plants in uptake of phosphorous and trace metals such as zinc and copper.

• (A)  Bacteria
• (B)  Viruses
• (C)  Fungi
• (D)  Cyanobacteria

Answer

Submitted By :Ali Uppal

Low level of CO2 favours _________ of the stomata.

• (A)  Opening
• (B)  Closure
• (C)  Both of these
• (D)  None of these

Answer

Submitted By :Ali Uppal

There are _________ hypothesis which may explain opening and closing of stomata?

• (A)  One
• (B)  Two
• (C)  Three
• (D)  Four

Answer

Submitted By :Ali Uppal