Plants And Light

Question 1

What is a long day plant?

Answer 1

A plant that blossoms in the summer

Question 2

What is phytochrome?

Answer 2

The pigment that controls light (acts like a steroid hormone)

Question 3

What spectrum of light does phytochrome favour?

Answer 3

Red light

Question 4

Does phytochrome react with all wavelengths of light?

Answer 4

Yes

Question 5

Does phytochrome inhibit or stimulate flowering in a plant?

Answer 5

Both

Question 6

What is photoperiodism?

Answer 6

the response of an organism to seasonal changes in day length

Question 7

What are the two types of phytochrome?

Answer 7

Phytochrome red and

Phytochrome far red

Question 8

Where is phytochrome found?

Answer 8

In the leaves of plants

Question 9

What happens when light strikes phytochrome red?

Answer 9

It reacts with the lift to make phytochrome far red

Question 10

Is the reaction from phytochrome red to phytochrome far red slow or fast?

Answer 10

Fast

Question 11

What does phytochrome far red do in short day plants (in terms of flowering)

Answer 11

Inhibits it

Question 12

In the absence of light what happens to the produced phytochrome far red?

Answer 12

Converts back to phytochrome red

Question 13

Is the conversion of phytochrome far red to phytochrome red fast or slow?

Answer 13

Slow

Question 14

In the fall/spring days are _______ and nights are ________.

Answer 14

Short

Long

Question 15

Short day plants in the spring/fall have a lot of _____ and not a lot of _____. Causing them to flower

Answer 15

Phytochrome red

Phytochrome far red

Question 16

Why don’t short day plants flower in the summer?

Answer 16

Nights aren’t long enough to convert enough phytochrome far red back into phytochrome red

Question 17

What does phytochrome far red do to long day plants? (In terms of flowering)

Answer 17

Stimulates flowering

Question 18

Summer has _____ days and _______ nights

Answer 18

Long

Short

Question 19

Long day plants in the summer have a lot of ________ and not a lot of _________. Causing the long day plants to flower

Answer 19

Phytochrome far red

Phytochrome red

Question 20

Why don’t long day plants flower in the spring/fall?

Answer 20

Nights are too long and days are too short so they don’t have enough phytochrome far red

Question 21

What is a short day plant?

Answer 21

A plant that blossoms in the spring/fall