Question 1

Which of the following statements about plant hormones is true?

Accepted Answer

A) Plant hormones mainly affect reproductive processes. 
B) Individual hormones typically have single,specific effects. 
C) Plant hormones are produced in very small concentrations. 
D) Plant hormones play a vital role in photosynthesis. 
A) Plant hormones mainly affect reproductive processes. 
B) Individual hormones typically have single,specific effects. 
C) Plant hormones are produced in very small concentrations. 
D) Plant hormones play a vital role in photosynthesis.

Question 2

Which of the following growth responses causes the shoots of a plant grown in the dark to grow upward?

Accepted Answer

A) thigmotropism 
B) gravitropism 
C) phototropism 
D) photoperiodism 
A) thigmotropism 
B) gravitropism 
C) phototropism 
D) photoperiodism

Question 3

Which of the following statements concerning biological clocks is false?

Accepted Answer

A) Movement of plants long distances very quickly induces a kind of plant "jet lag." 
B) Biological clocks are strongly influenced by external temperatures. 
C) Circadian rhythms occur with or without external stimuli. 
D) Innate circadian rhythms generally differ slightly from a 24- hour period. 
A) Movement of plants long distances very quickly induces a kind of plant "jet lag." 
B) Biological clocks are strongly influenced by external temperatures. 
C) Circadian rhythms occur with or without external stimuli. 
D) Innate circadian rhythms generally differ slightly from a 24- hour period.

Question 4

Which class of hormones produced in the roots of plants promotes cell division and growth,and retards the aging of flowers and leaves?

Accepted Answer

A) phytochromes 
B) ethylene 
C) cytokinins 
D) gibberellins 
A) phytochromes 
B) ethylene 
C) cytokinins 
D) gibberellins

Question 5

About how many gibberellins have been identified in plants?

Accepted Answer

A) thousands 
B) over one hundred 
C) five 
D) one 
A) thousands 
B) over one hundred 
C) five 
D) one

Question 6

Which plant in Went's experiment shows auxin stimulating elongation in the left side of the plant only?

Accepted Answer

A) plant A 
B) plant B 
C) plant C 
D) plant D 
A) plant A 
B) plant B 
C) plant C 
D) plant D

Exam 33: Control Systems in Plants

Which of the following statements about plant hormones is true?

Which of the following growth responses causes the shoots of a plant grown in the dark to grow upward?

Which of the following statements concerning biological clocks is false?

Which class of hormones produced in the roots of plants promotes cell division and growth,and retards the aging of flowers and leaves?

About how many gibberellins have been identified in plants?

Which plant in Went's experiment shows auxin stimulating elongation in the left side of the plant only?

Biology: Exploring Life

The Chemical Basis of Life

The Molecules of Cells

A Tour of the Cell

The Working Cell

How Cells Harvest Chemical Energy

Photosynthesis: Using Light to Make Food

The Cellular Basis of Reproduction and Inheritance

Patterns of Inheritance

Molecular Biology of the Gene

How Genes Are Controlled

Dna Technology and Genomics

How Populations Evolve

The Origin of Species

Tracing Evolutionary History

Microbial Life: Prokaryotes and Protists

The Evolution of Plant and Fungal Diversity

The Evolution of Invertebrate Diversity

The Evolution of Vertebrate Diversity

Unifying Concepts of Animal Structure and Function

Nutrition and Digestion

Gas Exchange

Circulation

The Immune System

Control of Body Temperature and Water Balance

Hormones and the Endocrine System

Reproduction and Embryonic Development

Nervous Systems

The Senses

How Animals Move

Plant Structure,growth,and Reproduction

Plant Nutrition and Transport

The Biosphere: an Introduction to Earths Diverse Environments

Behavioral Adaptations to the Environment

Population Ecology

Communities and Ecosystems

Conservation Biology

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