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Biology A2 > Coordination and Control in Plants > Flashcards

Coordination and Control in Plants Flashcards

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1
Q

Name 4 photoreceptors:

A

Light intensity
Light duration
Direction of light
Wavelength

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2
Q

What are some benefits of phototropism?

A

Receive the maximum amount of light for photosynthesis and development at the appropriate time of year

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3
Q

Where are auxins produced?

A

Apical Meristem

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4
Q

What is the growth effect that takes place with auxins?

A

Elongation of cells in zone of elongation

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5
Q

Where are Cytokinins produced?

A

Actively dividing tissues

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6
Q

What is the growth effect that takes place with cytokinins?

A

Cell division

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7
Q

Where are gibberellins produced?

A

Apical buds and leaves

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8
Q

What is the growth effect that takes place with gibberellins?

A

Elongation of intermodal regions

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9
Q

What are the characteristics of cells that divide by mitosis?

A

Small
Thin walls
Prominent nuclei
Lack large vacuoles

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10
Q

What happens to the cells in the zone of elongation?

A

Cells develop small vacuoles
Absorb water by osmosis

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11
Q

During auxin action what does the membrane pump out?

A

Pumps out hydrogen ions into the cellulose of the cell wall

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12
Q

What does effect do this hydrogen have?

A

Loosens linkages between cellulose microfibrils - wall is more flexible

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13
Q

How do cells absorb water?

A

By osmosis

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14
Q

More auxin =

A

more cell expansion

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15
Q

What is phytochrome?

A

A pigment found in the leaves of flowering plants

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16
Q

What are the 2 interchangeable forms of phytochrome?

A

Phytochrome 660
Phytochrome 730

17
Q

What is phytochrome 660?

A

Absorbs red light and rapidly converts to p730

18
Q

What is phytochrome 730?

A

Absorbs light in the far-red region of the spectrum, rapidly converts to p660

19
Q

A phytochrome =

A

protein + pigment

20
Q

What is photoperiodism?

A

A major influence on the timing of flowering in many plants is the length of day

21
Q

What is an example of a long day plant?

A

Poppy

22
Q

What is a long day plant also known as?

A

Short night plants

23
Q

What are long day plants?

A

Only flower if the length of day exceeds 12 hours - usually summertime

24
Q

What is an example of a short-day plant?

A

Chrysanthemum

25
Q

What are short-day plants also known as?

A

Long night plants

26
Q

What are short-day plants?

A

Only flower if the day length is shorter or less than 12 hours - usually autumn or winter

27
Q

What is an example of a neutral day plant?

A

Tomatoes

28
Q

What is a day neutral plant?

A

When the plants have grown sufficiently and flower regardless of the photoperiod

29
Q

What is the p730?

A

Physiologically active form of the pigment - it stimulates or inhibits flowering

Biology A2 (8 decks)

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