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Biology Laboratory Manual, 6/e

Darrell S. Vodopich, Baylor University
Randy Moore, University of Minnesota--Minneapolis

Exercise 32 - Plant Physiology

Choose the one answer that best answers the question.


1	The loss of water from plants is called ____ and typically occurs through the ____.
		A)	evaporation, leaves
		B)	transpiration, leaves
		C)	transpiration, stem
		D)	osmosis, roots


2	Through which part of the leaf does water transpire?
		A)	stomata
		B)	epidermis
		C)	xylem
		D)	chloroplast


3	Which of the following is the path of water from being absorbed by the plant to being transpired by the plant?
		A)	stoma, spongy mesophyll, xylem, root hair
		B)	root hair, xylem, palisade mesophyll, xylem, stoma
		C)	root hair, xylem, spongy mesophyll, xylem, stoma
		D)	root hair, spongy mesophyll, xylem, stoma


4	The structures that surround a stoma and regulate the amount of water leaving the cell are called ______.
		A)	chloroplasts
		B)	stomata
		C)	epidermal cells
		D)	guard cells


5	When the guard cells have a ___ water pressure, they become ____ and close the stoma.
		A)	low, turgid
		B)	low, flaccid
		C)	high, turgid
		D)	high, flaccid


6	The guard cells not only regulate water loss by opening and closing the stomata, but also affect the diffusion of which photosynthetically important gas?
		A)	oxygen
		B)	carbon dioxide
		C)	carbon monoxide
		D)	nitrogen


7	The majority of stomata are found ____.
		A)	on the upper side of the leaf
		B)	on the lower side of the leaf
		C)	along the stem
		D)	all over the plant


8	What effect will adding 10% NaCl to a plant have?
		A)	The stomata will open causing the plant to lose water.
		B)	The stomata will close starving the plant of carbon dioxide.
		C)	The stomata will close starving the plant of oxygen.
		D)	The plant cells will fill with water from osmosis causing the plant to become turgid.

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