PLANT PP2 PT2

Question 1

Ethylene (H2C = CH2) is a gas formed from

Answer 1

the amino acid methionine.

Question 2

2 effects of ethylene

Answer 2

Abscission

Ripening of fruits

Question 3

In this effect, ethylene stimulates certain enzymes, such as cellulase, which helps cause leaf, fruit, or flower drop, which is the effect

Answer 3

Abscission

Question 4

This effect Increases the activity of enzymes, such as cellulase, that soften fruits
It also promotes the activity of enzymes that produce the flavor and smell of ripened fruits. what is it

Answer 4

Ripening of fruits

Question 5

Plant growth toward or away from a unidirectional stimulus is called

Answer 5

tropism

Question 6

positive tropism is

Answer 6

growth toward the stimulus

Question 7

negative tropism is

Answer 7

growth away from the stimulus

Question 8

movement in response to gravity

Answer 8

Gravitropism

Question 9

movement in response to light

Answer 9

Phototropism

Question 10

movement in response to touch

Answer 10

Thigmotropism

Question 11

When a plant is placed on its side, the stem grows upward, opposite of the pull of gravity is what type of gravitropism

Answer 11

Negative gravitropism

Question 12

Stems with root caps grow downward is what gravitropism. Response depends on sensors called

Answer 12

positive, statoliths

Question 13

Auxin may be responsible for:
Positive gravitropism of ____, and
Negative gravitropism of ____

Answer 13

of roots, and and negative gravitropism of shoots

Question 14

Positive phototropism of stems occurs because cells on the shady side of the stem

Answer 14

elongate due to the presence of auxin.

Question 15

A pigment related to riboflavin thought to act as a photoreceptor when phototropism occurs.
Auxin migrates to
Shady sides elongate

Answer 15

shady side of stem

faster than bright side