Biology Mcqs

___________ 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

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