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Biology Laboratory Manual, 6/e

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

Exercise 33 - Plant Physiology

Choose the one answer that best answers the question.


1	What is a tropism?
		A)	an internal chemical signal that controls a plant's growth and development
		B)	a movement in response to an external stimulus
		C)	a movement in response to light stimulus
		D)	a pigment that absorbs light and affects seed germination


2	What is the term for growth in response to gravity?
		A)	tropism
		B)	phototropism
		C)	growth regulator
		D)	gravitropism


3	How would phototropism be beneficial to plants?
		A)	By keeping the leaves oriented perpendicularly to light, the plant can increase water loss.
		B)	By keeping the leaves oriented parallel to light, the plant can increase water loss.
		C)	By keeping the leaves oriented perpendicularly to light, the plant can increase the photosynthesis rate.
		D)	By keeping the leaves oriented parallel to light, the plant can decrease the photosynthesis rate.


4	Which part of a plant cell is thought to aid plants in sensing gravity in their roots?
		A)	amyloplasts
		B)	chloroplasts
		C)	nucleus
		D)	mitochondria


5	What is phytochrome?
		A)	A pigment that absorbs light and affects photosynthesis
		B)	A pigment that absorbs light and affects seed germination
		C)	A pigment that senses gravity and affects seed germination
		D)	A macronutrient


6	Which of the following wavelengths of light would stimulate germination?
		A)	450 nm
		B)	540 nm
		C)	660 nm
		D)	730 nm


7	A plant that appears pale and spindly with small leaves is referred to as ____.
		A)	gravitropic
		B)	wilted
		C)	etiolated
		D)	an albino


8	Which of the following is considered a macronutrient for most plants?
		A)	iron
		B)	copper
		C)	magnesium
		D)	manganese


9	What is a major function of auxin?
		A)	controls the abscission of leaves
		B)	promotes stem elongation
		C)	absorbs light and affects seed germination
		D)	a component of proteins


10	How would gibberellic acid be beneficial to plants?
		A)	By suppressing lateral buds, the plant will not have too many leaves to block each other's availability to light.
		B)	By hastening the ripening of fruit, the plant's seeds will be dispersed sooner.
		C)	By promoting leaf senescence, the plant can save energy by reabsorbing photosynthetically important molecules.
		D)	By increasing stem and internode elongation, the plant will be able to grow taller and gain access to light.

2002 McGraw-Hill Higher Education
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