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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

4.2.9 Antimicrobial Properties of Plants – Unit exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
Which statement best describes Cohesion?
A negatively charged ion, e.g. PO43−.
A charged atom or group of atoms not containing carbon-hydrogen bonds, e.g. Na+, NO3−.
Attraction between water molecules and other surfaces, such as xylem walls.
Attraction between water molecules due to hydrogen bonding.
2.

The Hardy–Weinberg equation is

p² + 2pq + q² = 1
p + q = 2
p² + q² = 1
2pq = 1
3.
The Hardy-Weinberg principle describes a population in which
mutation rates are high
natural selection is strong
allele frequencies stay constant from generation to generation
migration is frequent
4.
IGCSE Biology 2.1 Animal and Plant Cells - Question 4
IGCSE Biology 2.1 Animal and Plant Cells - Question 4
A
B
C
D
5.
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
6.

The Hardy–Weinberg equation can be used to

see whether allele frequencies in a population are changing over time
count species
measure habitat area
classify organisms
7.

Which is a mechanism of reproductive isolation?

Different breeding seasons
Sharing the same habitat
Identical courtship
Gene flow
8.
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
9.
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
10.
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
11.
IGCSE Biology 1.3 Dna in Classification - Question 5
IGCSE Biology 1.3 Dna in Classification - Question 5
A
B
C
D
12.
Which statement best describes Anion?
A negatively charged ion, e.g. PO43−.
The energy needed to change liquid water into vapour; high for water, making sweating effective.
The energy needed to raise the temperature of 1 kg of a substance by 1 °C; high for water (4.2 kJ kg−1 °C−1).
A positively charged ion, e.g. Ca2+.
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Part of Topic 4 · Biodiversity and Natural Resources — see every lesson and quiz in this unit.
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