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UWCSEA IB Biology - 9.3 Plant Growth Flashcards | StudBud
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UWCSEA IB Biology - 9.3 Plant Growth
UWCSEA IB Biology - 9.3 Plant Growth
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IB Biology HL topic 9 Plant Biology - 9.3 Growth
Flashcards
21 cards
F
Practice quiz
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Host live
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Questions
21
Answers
1
What are regions of growth called in plants?
Apicals
Tips
Auxiliary buds
Meristems
2
What are regions of growth at tips of roots and shoots called?
Meristematic Apexes
Auxilliary meristems
Auxilliary buds
Apical meristems
3
IAA
Inhibits growth at high concentrations
All of these
Controls the growth in the shoot apex
Is transported down the stem and stimulates growth
4
Undifferentiated meristem cells in plants allows...
Growth from phototropism
Increase the size of the plant cell.
Plant equality.
Indeterminate plant growth
5
Where are primary meristems found?
Shoots
Tips of roots and shoots
Tips of shoots
Roots
6
What is micropropagation?
Plant growth from dead sample (PLANT RESURRECTION)
Small tissues of plant can be used to grow whole plants.
A little propagation
Cloning from an explant.
7
Tropisms affect...
Cell enlargement
Cell division
The environment
Amount of auxin produced.
8
What are shoots that form at the junction of the stem and base of a leaf
Roots tips
Apical meristems
Auxilliary shoots
Axillary buds
9
What condition is essential for micropropagation?
Cold temperature
Light
Sterilised
Clean
10
Plant cells have the ability to develop into a whole plant- they are...
Pluripotent
Omnipotent
Totipotent
Multipotent
11
What is the role of PIN3 proteins?
They transport IAA from root to tip
The transport of auxin to regions of shade and down the tip
Production of auxin and transportation down the stem
Expression of genes for auxin transport
12
Axillary buds are
Regions of meristem
Buds at the apex of the shoot
Roots that form at the base of lead primordia
Shoots that form at the junction (node) of the stem and leaf
13
What happens to the cellulose fibres in cell walls as levels of auxin in the cell increase?
They loosen, allowing elongation
They make the cell become turgid
They break, causing expansion
The tighten, reducing elongation
14
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.
Supports apical growth by extending apical meristem in roots
Replace damaged apical meristems produce flowers or leaves.
15
What is contained in the growth medium (agar) to allow plant to grow?
Minerals and sucrose
Plant hormones
Undifferentiated cells
Fertiliser
16
What are the functions of auxin efflux pumps?
Pump auxin out of the cell, altering its distribution
Act as carrier proteins for auxin to be pumped into the cell
Helps the transport of auxin from the tip to areas in light
Accepts auxin from other cells
17
Apical dominance
When lateral growth is inhibited causing a longer shoot tip
When lateral growth is greater than apical growth
Equal growth of the apex of the shoot and axillary buds
Is the shorter length of shoots vs roots
18
What happens when cells in the meristem divide?
One cell remains in the meristem, the other differentiates
Both cells remain in the meristem
Both cells differentiate into new cells
One cell become auxilliary
19
Geotropism is...
Plant grows towards the light
Roots grows into the ground
Growth in stem of the plant
Plant grows upwards
20
What is primary growth?
Growth by apical meristem to increase horizontal size.
Apical growth to produce shoots and branches.
Growth by apical meristem to increase stem length.
Growth by lateral meristem to increase vertical size.
21
A type of auxin is
Giberellins
IAI
IAP
IAA
