Stomata open due to _________ of K+ into the guard cells from the surrounding epidermis

A. Diffusion
B. Active transport
C. Osmosis
D. All of these

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.

Single circuit heart is found in_________?

A. Fishes
B. Amphibians
C. Reptiles
D. Mammals

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

A. One
B. Two
C. Three
D. Four

Low level of CO2 favours _________ of the stomata.

A. Opening
B. Closure
C. Both of these
D. None of these

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

A. Bacteria
B. Viruses
C. Fungi
D. Cyanobacteria

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

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

Open circulatory system can contain_________?

A. Red blood cells
B. White blood cells
C. Haemoglobin
D. All of these

Pressure flow theory was proposed by_________?

A. H-van mohl
B. Dixon
C. Vander wall.
D. Earnst munch

The opening and closing of stomata is directly controlled by the___________?

A. Temperature
B. Ph
C. Light
D. None of these