What is primary growth?

Growth by apical meristem to increase stem length.

Why does auxin travel from the tip of the plant to the stem and downwards?

To maintain concentration gradient.

What is contained in the growth medium (agar) to allow plant to grow?

Plant hormones, Minerals and sucrose

Plant grows upwards, Roots grows into the ground

What is micropropagation?

Small tissues of plant can be used to grow whole plants.

What are the functions of auxin efflux pumps?

Pump auxin out of the cell and distribute to where needed.

Cell division, Cell enlargement

What is another function of lateral meristems besides growth in vascular cambium?

Replace damaged apical meristems produce flowers or leaves.

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9.3 Plant Growth

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IB Biology HL topic 9 Plant Biology - 9.3 Growth

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Questions 13

Answers

1
What is primary growth?
Growth by apical meristem to increase horizontal size.
Growth by lateral meristem to increase vertical size.
Growth by apical meristem to increase stem length.
Apical growth to produce shoots and branches.
2
Why does auxin travel from the tip of the plant to the stem and downwards?
To inhibit growth.
To maintain concentration gradient.
To get to the roots.
To get away from the light.
3
Auxin has different responses to certain gene expressions and can alter them accordingly.
False
True
4
Auxin effux pumps are produced in cells where needed.
True
False
5
What is contained in the growth medium (agar) to allow plant to grow?
Plant hormones
Fertiliser
Undifferentiated cells
Minerals and sucrose
6
Geotropism is...
Plant grows towards the light
Plant grows upwards
Growth in stem of the plant
Roots grows into the ground
7
What is micropropagation?
A little propagation
Plant growth from dead sample (PLANT RESURRECTION)
Small tissues of plant can be used to grow whole plants.
Cloning from an explant.
8
Undifferentiated meristem cells in plants allows...
Indeterminate plant growth
Increase the size of the plant cell.
Growth from phototropism
Plant equality.
9
What are the functions of auxin efflux pumps?
Helps the transport of auxin from the tip to the shaded area
Pump auxin out of the cell and distribute to where needed.
Accepts auxin from other cells
Act as carrier proteins for auxin to be pump into the cell.
10
What happens to the cellulose fibres in cell walls as levels of auxin in the cell increase?
They break
The tighten
They make the cell become turgid
They loosen
11
Tropisms affect...
Amount of auxin produced.
Cell division
The environment
Cell enlargement
12
What is another function of lateral meristems besides growth in vascular cambium?
Produce auxin for plant growth.
Accepts auxin by auxin receptors for cell elongation.
Replace damaged apical meristems produce flowers or leaves.
Supports apical growth by extending apical meristem in roots
13
What condition is essential for micropropagation?
Clean
Sterilised
Cold temperature
Light

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