Practice Pakistan's most useful MCQs for competitive exams

The flow of lymph is maintained by__________?

• (A)  Movement of viscera
• (B)  Breathing movements
• (C)  Valves
• (D)  All of these

Answer

Submitted By :Ali Uppal

Introduction of vaccine within the body to produce immunity is an example of____________?

• (A)  Artificially induced active immunity
• (B)  Naturally induced active immunity
• (C)  Artificially induced passive immunity
• (D)  Naturally induced passive immunity

Answer

Submitted By :Ali Uppal

Lenticular transpiration is ___________ of total transpiration?

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

Answer

Submitted By :Ali Uppal

All plants do not possess___________?

• (A)  Lenticels
• (B)  Cuticle
• (C)  Stomata
• (D)  All of these

Answer

Submitted By :Ali Uppal

Cuticular transpiration is _________ of total transpiration?

• (A)  6-8%
• (B)  5-7%
• (C)  7-9%
• (D)  4-6%

Answer

Submitted By :Ali Uppal

___________ function as multisensory hydraulic valve?

• (A)  Lenticels
• (B)  Guard cells
• (C)  Hydathods
• (D)  All of these

Answer

Submitted By :Ali Uppal

Stomatal transpiration is __________ of total transpiration

• (A)  90%
• (B)  91%
• (C)  93%
• (D)  95%

Answer

Submitted By :Ali Uppal

A pressure created by active secretion of salts and other solutes from other cells into xylem sap is called___________?

• (A)  Transpiration pull
• (B)  Root pressure
• (C)  Osmotic pressure.
• (D)  None of these

Answer

Submitted By :Ali Uppal

Pulling upward of water and dissolved minerals towards the leaves through the xylem tissue is called__________?

• (A)  Transpiration pull
• (B)  Root pressure
• (C)  Ascent of sap.
• (D)  All of these

Answer

Submitted By :Ali Uppal

Transport of minerals from soil to epidermal cells of roots via carrier protein molcules along their concentration gradient is called___________?

• (A)  Diffusion.
• (B)  Facilitated diffusion.
• (C)  Passive transport.
• (D)  Active transport.

Answer

Submitted By :Ali Uppal