Biology 5.4.1 Flashcards

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1
Q

Which Plant Hormones Coordinate & Control Growth?

A

Auxins.

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2
Q

Plants need to be able to Grow in Response to ___ and ___.

A

Light, Gravity.

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3
Q

The Shoots of a Plant must Grow ___, away from ___, & towards ___. Why?

A

Upwards, Gravity, Light. So that the Leaves are able to Absorb Sunlight.

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4
Q

The Roots of a Plant must Grow ___, away from ___, & towards ___. Why?

A

Downwards, Light, Gravity. In order to Anchor the Plant, & Absorb Water & Mineral Ions from the Soil.

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5
Q

What is ‘Gravitropism’?

A

Growth Towards or Away from Gravitational Pull.

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6
Q

What is ‘Phototropism’?

A

Growth Towards or Away from Source of Light.

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7
Q

Where are Auxins being Produced in Plants?

A

In the Tips of the Roots & Shoots.

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8
Q

In the Shoots, Auxins ___ Cell Elongation (Growth).

A

Promote.

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9
Q

In the Shoots, More Auxins = …

A

More Cell Elongation (More Cell Growth).

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10
Q

In the Roots, Auxins ___ Cell Elongation (Growth).

A

Inhibit.

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11
Q

In the Roots, Less Auxins = …

A

Less Cell Elongation (Less Cell Growth).

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12
Q

What is the Distribution of Auxin in the Shoots Affected by? (2)

A

-Light.

-Gravity.

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13
Q

What is the Distribution of Auxins in the Roots Primarily Affected by?

A

Gravity.

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14
Q

What does ‘Unequal Distribution’ of Auxins Cause in Plant Roots & Shoots?

A

Unequal Distribution of Auxins Cause Unequal Growth Rates in Plant Roots & Shoots.

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15
Q

Explain the Process of how Auxins Stimulate Growth in Plant Shoots (Positive Phototropism)? (4)

A

-Auxins are made (Synthesised) in the Tips of the Shoots.

-In the Prescence of Strong Directional Light, Auxins Diffuse Away from it, Towards the Shaded Side.

-Uneven Growth is Caused by the Uneven Distribution of Auxins.

-Auxins will Increase Growth of Cell in Meristem, so will Cause Shaded Side to Grow & Elongate Faster than the Side in the Light.

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16
Q

What is ‘Positive Phototropism’?

A

Positive Phototropism in Plants is a Result of Auxins Accumulating on the Shaded Side of a Shoot.

17
Q

Auxins are an Example of Plant ___.

A

Hormones.

18
Q

Auxins are a Plant ___.

A

Hormone.

19
Q

What are ‘Gibberellins’? (2)

A

-Plant Hormones that Initiate Seed Germination.

-Plant Hormones that Induce Flowering & the Growth of Fruit.

20
Q

What is the Plant Hormone that Initiates Seed Germination?

A

Gibberellin.

21
Q

What is the Plant Hormone that Induces Flowering & the Growth of Fruit?

A

Gibberellin.

22
Q

Which Plant Hormone is a Gas Released by the Plant that Controls Cell Division, & the Ripening of Fruits?

A

Ethene.

23
Q

Both Plant Hormones Gibberellins & Ethene are Used ___.

A

Commercially.