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Course: Edexcel A Level Biology A (SNAB) 9BI0
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Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

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Topic 2 · Genes and Health

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Topic 3 · Voice of the Genome

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Topic 4 · Biodiversity and Natural Resources

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Topic 5 · On the Wild Side

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Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

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Topic 8 · Grey Matter

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Quiz

4.2.2 Plant Stems – Exam questions

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  • Questions count: 10
  • Passing grade: B+
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1.
The unequal growth of a plant stem, where the shaded side grows faster than the sunlit side, is an example of
The unequal growth of a plant stem, where the shaded side grows faster than the sunlit side, is an example of
gravitropism.
phototropism.
thigmotropism.
photoperiodism.
phototaxis.
2.
A student explained why a plant stem bends toward a window as follows. Step 1: Light falls on one side of the stem. Step 2: Auxin moves to the lit side of the stem. Step 3: Cells on the side with more auxin elongate more. Step 4: The stem bends toward the light source. Which step is wrong?
Step 1
Step 2
Step 3
Step 4
3.
Compare: Quantity A is the speed of the response of Mimosa leaves to touch; Quantity B is the speed at which a stem bends toward light. Which is correct?
Quantity A is greater
Quantity B is greater
The two quantities are equal
The information given is insufficient
4.
Why were wheat plants bred to have short stems?
So more energy goes to grain and they are not flattened
To increase photosynthesis in stems
To make them taller than weeds
To attract more insects
5.
In the stem section, tissue X has lignified dead cells and tissue Y living cells with sieve plates. What are they?
Dr Dabour Hub Academy - figure 1
X phloem; Y xylem
Both xylem
X cuticle; Y stomata
X xylem; Y phloem
6.
Plant clones can be made by taking cuttings. Which variable must be controlled when comparing rooting hormones?
Type of hormone
Number of roots formed
The conclusion
Cutting length and growing conditions
7.
Which hypothesis could be tested in plant tissue culture?
Plants are green
Agar is jelly
Explants on medium with growth hormone will form more shoots than those without
Cells exist
8.
Which technique is essential in plant tissue culture?
Open-air culture
Sterile (aseptic) technique to prevent microbial contamination
Using unsterilised tools
Adding soil to the medium
9.
All plants grown from one tissue culture are identical. What is a disadvantage for a crop?
A single disease could affect all of them because there is no genetic variation
They grow too slowly
They have too much variation
They cannot photosynthesise
10.

Gibberellins affect stem growth by

inhibiting elongation
closing stomata
stimulating cell elongation and division, so that plants grow tall
causing leaf fall
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Part of Topic 4 · Biodiversity and Natural Resources — see every lesson and quiz in this unit.
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