___________ function as multisensory hydraulic valve?
(A) Lenticels
(B) Guard cells
(C) Hydathods
(D) All of these
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.
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
Which of the following are proteins in nature?
(A) Antibodies.
(B) Interferons
(C) Antitoxins
(D) All of these
Cooley’s anemia is another name used for___________?
(A) Leucemia
(B) Thalassaemia
(C) Sickle cell anemia
(D) None of these
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