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IGCSE Biology Plant Structure and Function Flashcards | StudBud
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IGCSE Biology Plant Structure and Function
IGCSE Biology Plant Structure and Function
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IGCSE Biology Plant Structure and Function
Flashcards
40 cards
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Practice quiz
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Host live
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Questions
40
Answers
1
The response enabled by auxin in this image is called:
phototropism
geotropism
transpiration
photosynthesis
2
Where on a plant is pollen placed during pollination?
Sepal
Leaf
Stigma
Petal
3
What technique gets chlorophyll out of a leaf?
boiling the leaf in water
boiling the leaf in ethanol
testing with iodine stain
placing it in the dark
4
In which situation will water enter a root hair cell?
if conc. of water is higher in the cell than the soil
if the conc. of water is higher in the soil than in the cell
if the conc. of solutes is lower in the cell than the soil
if the conc. of solutes is lower in soil than in the cell
5
What are the commercial applications of Auxin?
Selective weedkiller
Promotes cell division in tissue cultures
Rooting powder
All of these
6
What is auxin ?
A plant hormone that controls growth
a hormone that ripens fruit
a hormone that stimulates thyroxine
a hormone that prevents fertilisation
7
Pollination
Pollination is pollen that moves from the stamen to the pistil
Pollination is a drink
Pollination is a bee species
Pollination is a dance move
8
What is Germination?
A process where fruit develops
A process that destroys all germs within an organism
The flowering of a plant
A process by which a plant grows from a seed
9
This female part of a flower, matures to become fruit to help disperse seeds
Stigma
Style
Ovule
Ovary
10
Which of the following is
NOT
needed for a seed to germinate?
oxygen
water
light
warmth
11
How do you test for starch in a leaf?
phenolphthalene
iodine
benedicts
litmus paper
12
What are the products of photosynthesis?
water and carbon dioxide
glucose and carbon dioxide
water and oxygen
glucose and oxygen
13
What tissue transports the product of photosynthesis?
palisade
xylem
phloem
parenchyma
14
Some of the factors affecting transpiration rate are:
wind & air movement
all of the above
Soil moisture availabilty
Relative humidity & temperature
15
What seed Dispersal method do these seeds represent?
Animal
Wind
Ejection
Water
16
cross pollination is a process in which pollen of one plant unites with a cell?
false
true
17
What kind of reaction is photosynthesis?
endothermic reaction
exothermic reaction
18
What is the limiting factor at y?
concentration of carbon dioxide
temperature
water
light intensity
19
What is the limiting factor at x?
temperature
water
concentration of carbon dioxide
light intensity
20
In a green shoot, where does auxin concentrate?
The dark side
The light side
The inside
It moves to the leaf
21
Which of the following DOESN'T affect the movement of water out of a leaf?
air speed
temperature
CO2 levels
humidity
22
What is the product of photosynthesis?
sucrose
H2O
C6H12O6
CO2
23
In which cells does most photosynthesis take place?
chloroplasts
guard cells
root hair cells
palisade cells
24
Pollination is ...
pollen transferring from the anther to the stigma.
pollen tubules penetrating into the ovules.
pollen inserting into the style.
pollen fertilising the ovaries.
25
Why is there a beaker of water between the light and the plant?
to absorb heat
to look pretty
to magnify the light
to cool the plant
26
These regulate the movement of gases into and out of the leaf.
air cells
spongy cells
guard cells
blank cells
27
What pulls water up the plant in transpiration?
New water entering the roots
Weak forces of attraction between water molecules
Water evaporating from the stomata
Active transport
28
After pollination, this structure develops to carry the male nuclei to the egg cells for fertilization.
pollen tube
toothpaste tube
anther tube
stigma tube
29
How does auxin cause shoots to bend towards sunlight?
Auxin causes cell elongation
Auxin is always evenly distributed
Auxin inhibits growth
Auxin accumulates on the shaded side
30
How does auxin move through the plant?
by active transport
in solution by diffusion
in solution by osmosis
as a solid by diffusion
31
What is the effect of auxin?
Causes cell enlongation
Causes mutations
Causes cell differentiation
Causes cell division
32
How does water enter a root hair cell?
movement
active transport
carrier proteins
osmosis
33
How can we find the rate of transpiration of a plant using a potometer?
Distance bubble moves / time taken
Time taken for bubble to move / distance moved
Time taken / √distance bubble moves
Distance bubble moves x time taken
34
What limiting factor might a greenhouse help with?
all
CO2
temperature
light
35
What are the cells that surround stomata?
palisade cells
upper epidermal cells
guard cells
stem cells
36
If humidity is increased, what will happen to the transpiration rate?
It will reverse
It will decrease
It will increase
It will stay the same
37
Where is auxin made?
Stem
Flowers
Shoot tips
Root tips
38
The main environmental factors affecting germination are
moisture, crowding and temperature
oxygen, moisture and temperature
light, oxygen and moisture
viability, moisture and temperature
39
The leaf layer with air spaces in it. Allows for diffusion of gases for photosynthesis.
cuticle
palisade mesophyll
vascular tissue
spongy mesophyll
40
How do minerals get absorbed into the root hair cells?
diffusion
active transport
osmosis
transpiration
