CONCEPT MAPPING Use the following terms to create a concept map that shows the major effects of some plant hormones: apical dominance, auxin, cytokinin, gibberellin, gravitropism, plant hormone, phototropism, and thigmotropism.

Critical Thinking

21. Predicting Results Suppose you placed a green banana in each of several plastic bags, placed a ripe pear in half of the bags, and then sealed all of the bags. Which group of bananas do you think would ripen sooner? Justify your answer.

22. Evaluating Results Suppose that a friend who lives in North Dakota gives you a cutting from a flowering plant that you admired when you saw it growing in your friend's yard. You plant the cutting at your home in Georgia. The plant grows but does not produce flowers. Based on your knowledge of plant responses, what might be preventing the plant from flowering?

23. inferring Relationships The growth of most deciduous trees in the northern United States and Canada, where winters are severe, is regulated strictly by photoperiodism. That is, temperature plays no part in the regulation of their yearly growing cycle. Explain why this is ecologically significant.

24. interpreting Graphics Suppose you notice that your neighbor has a perfect yard but that some of the plants in your yard have distorted leaves, like those in the photo shown below. What likely caused the leaves' unusual appearance?

Ms/ Standardized Test Preparation

DIRECTIONS: Choose the letter of the answer choice that best answers the question.

1. Which of the following is the name for the process in which flowering is stimulated by exposure of plants to cold?

A. dormancy

B. vernalization

C. thigmotropism

D. photoperiodism

2. Which of the following is a result of abscission?

F. Leaves fall off stems.

G. Cuttings are produced.

H. Plants sense night length. J. Abscisic acid is produced.

3. Which of the following describes the relationship between nastic movements and a stimulus?

A. Nastic movements occur without a stimulus.

B. Nastic movements occur toward a stimulus.

C. Nastic movements occur away from a stimulus.

D. Nastic movements occur independently of the direction of a stimulus.

4. What is the response of a plant to the length of days and nights called?

F. gravitropism

G. phototropism

H. photoperiodism J. thigmotropism

INTERPRETING GRAPHICS: The illustration below shows a growing seedling. Use the illustration to answer the question that follows.

5. Which of the following statements about this seedling is true?

A. The seedling is exhibiting abscission.

B. The shoot is exhibiting positive phototropism.

C. The roots are exhibiting negative gravitropism.

D. The seedling is exhibiting negative thigmotropism.

DIRECTIONS: Complete the following analogy.

6. cell elongation : gibberellins :: cell division :

F. auxins

G. ethylene

H. cytokinins

J. abscisic acid

INTERPRETING GRAPHICS: The diagrams below represent three different growing conditions. Use the diagrams to answer the question that follows.

17 hr light

7 hr dark

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