Biology Mcqs

Pressure flow theory was proposed by_________?

A. H-Van Mohl
B. Dixon
C. Vander wall.
D. Earnst Munch

Open circulatory system can contain_________?

A. Red Blood Cells
B. White Blood Cells
C. Haemoglobin
D. All of these

95% of the cytoplasm of red blood cells is the___________?

A. Antibodies
B. Hemoglobin
C. Enzymes
D. Proteins

_________ give rise to macrophages, which destroy larger particles by phagocytosis.

A. Nautrophils
B. Basophila
C. Monocyte
D. Lymphocyte

___________ function as multisensory hydraulic valve?

A. Lenticels
B. Guard cells
C. Hydathods
D. All of these

Stomatal transpiration is __________ of total transpiration

A. 90%
B. 91%
C. 93%
D. 95%

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

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

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.

Lenticels look like__________?

A. A big pore
B. Stoma
C. Sponge
D. Cars or small protusions