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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

0/50 Dr Dabour Hub Science Diagram and Course Material

Topic 2 · Genes and Health

0/76 Dr Dabour Hub Science Diagram and Course Material

Topic 3 · Voice of the Genome

0/55 Dr Dabour Hub Science Diagram and Course Material

Topic 4 · Biodiversity and Natural Resources

0/51 Dr Dabour Hub Science Diagram and Course Material

Topic 5 · On the Wild Side

0/72 Dr Dabour Hub Science Diagram and Course Material

Topic 6 · Immunity, Infection and Forensics

0/41 Dr Dabour Hub Science Diagram and Course Material

Topic 7 · Run for your Life

0/55 Dr Dabour Hub Science Diagram and Course Material

Topic 8 · Grey Matter

0/51 Dr Dabour Hub Science Diagram and Course Material
Quiz

4.2.4 Starch and Cellulose- Structure and Function – Unit exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
IGCSE Biology 1.3 Dna in Classification - Question 4
IGCSE Biology 1.3 Dna in Classification - Question 4
A
B
C
D
2.
Which property explains cooling by sweating?
High latent heat of vaporisation
Cohesion
Ice is less dense
Adhesion
3.

Gibberellins affect stem growth by

inhibiting elongation
closing stomata
stimulating cell elongation and division, so that plants grow tall
causing leaf fall
4.
IGCSE Biology 2.1 Animal and Plant Cells - Question 2
IGCSE Biology 2.1 Animal and Plant Cells - Question 2
A
B
C
D
5.

Which is a mechanism of reproductive isolation?

Different breeding seasons
Sharing the same habitat
Identical courtship
Gene flow
6.
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
7.

B4.2 Ecological niches — Question 2 | DABOUR HUB

Dr Dabour Hub Science Diagram and Course Material
A
B
C
D
8.
IGCSE Biology 2.1 Animal and Plant Cells - Question 12
IGCSE Biology 2.1 Animal and Plant Cells - Question 12
A
B
C
D
9.
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
10.
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
11.
A population of frogs is 9 percent speckled (recessive) and 91 percent without speckles. What are the frequencies of the p and q alleles at Hardy-Weinberg equilibrium?
A population of frogs is 9 percent speckled (recessive) and 91 percent without speckles. What are the frequencies of the p and q alleles at Hardy-Weinberg equilibrium?
p = 0.49, q = 0.51
p = 0.60, q = 0.40
p = 0.70, q = 0.30
p = 0.49, q = 0.30
p = 0.49, q = 0.09
12.
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.
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Part of Topic 4 · Biodiversity and Natural Resources — see every lesson and quiz in this unit.
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