Entry Test MCQ :: Transport

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21.

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

22.

Lenticels look like

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

23.

Stomatal transpiration is _____ of total transpiration

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

24.

They function as multisensory hydraulic valve

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

25.

There are _______ hypothesis which may explain opening and closing of stomata

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

26.

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

27.

Low level of CO2 favours _____ of the stomata

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

28.

The opening and closing of stomata is directly controlled by the

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

29.

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

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

30.

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.