PLANT RESPONSES AND GROWTH

PLANT RESPONSES AND GROWTH
PLANT RESPONSES AND GROWTH
PLANT RESPONSES AND GROWTH
PLANT RESPONSES AND GROWTH
PLANT RESPONSES AND GROWTH
PLANT RESPONSES AND GROWTH
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Class: Date: Name:
PLANT RESPONSES AND GROWTH
AUXIN AUXIN FLOWERS FRUIT GERMINATION GRAVITY
HORMONE HORMONES LEAVES LIGHT TROPISM
A plant’s growth response toward or away from a stimulusis called a
(1) ______________ .Touch, (2) ______________ , and (3) ______________ are three important stimuli to which plants show growth responses, or tropisms.

A (4) ______________ produced by a plant is a chemical that affects how the plant
grows and develops. In addition to tropisms, plant (5) ______________ also control
(6) ______________ , the formation of (7) ______________ , stems, and leaves, the shedding of
(8) ______________ , and the development and ripening of (9) ______________ . One important plant hormone is named (10) ______________ . (11) ______________ speeds up the rate at which a plant’s cells grow.

DORMANCY FLOWER PHOTOPERIODISM PHOTOPERIODISM
SHORTER LONGER
Plant responses to seasonal changes include (12)______________ and
(13) ______________. (14) ______________ is a plant’s response to seasonal changes in
length of night and day. Short-day plants flower when nights are (15) ______________ than a critical night length. Long-day plants flower when nights are (16) ______________ than a critical night length. The critical night length is the number of hours
of darkness that determines whether or not a plant will (17) ______________.

DORMANCY DORMANCY FREEZING LIGHT LONGER
SHORTER SUMMER WATER

Short-day plants bloom in the fall or winter, when nights are growing
(18) ______________ . Long-day plants flower in the spring or (19) ______________ , when nights are getting (20) ______________ .The flowering cycle of day-neutralplants is not sensitive to periods of (21) ______________ and dark.

As winter draws near, many plants prepare to go into a state of
(22) ______________ .(23) ______________ is a period when an organism’s growth or activity
stops. Dormancy helps plants survive (24) ______________ temperatures and the lack
of liquid (25) ______________ .



ANNUALS ANNUALS BIENNIALS BIENNIALS BIENNIALS
PEONIES PERENNIALS PERENNIALS PERENNIALS

Angiosperms are classified as annuals, (26) ______________ , or(27) ______________ based
on the length of their life cycles. Flowering plants thatflower and die in the
same year are called (28) ______________ . (29) ______________ include marigolds and petunias.Wheat and cucumbers are also annuals. (30) ______________
complete their life cycle in two years. Parsley and celery are (31) ______________
Flowering plants that live for more than two years are called (32) ______________ Maple trees and (33) ______________ are examples of (34) ______________.

Answer Key

1. Tropism
2. Light
3. Gravity
4. Hormone
5. Hormones
6. Germination
7. Flowers
8. Leaves
9. Fruit
10. Auxin
11. Auxin
12. Photoperiodism
13. Dormancy
14. Photoperiodism
15. Longer
16. Shorter
17. Flower
18. Longer
19. Summer
20. Shorter
21. Light
22. Dormancy
23. Dormancy
24. Freezing
25. Water
26. Biennials
27. Perennials
28. Annuals
29. Annuals
30. Biennials
31. Biennials
32. Perennials
33. Peonies
34. Perennials
Total Pages
3 pages
Answer Key
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