GCSE EDEXCEL BIOLOGY MAY 2023 - PAPER 1 HIGHER TIER
MARK SCHEME (1BI0/1H). WITH ACTUAL EXAM QUESTIONS
AND CORRECT ANSWERS WITH RATIONALES GRADED A+ /
LATEST EXAMS (BRAND NEW).
What are some examples of diffusion? --CORRECT ANSWER--- - the diffusion of oxygen into the
cells of the body from the bloodstream as the cells are respiring (and using up oxygen)
- the diffusion of carbon dioxide into actively photosynthesising plant cells
- the diffusion of simple sugars and amino acids for the gut through cell membranes
When, and in which direction, will diffusion take place in solutions and in gases? --CORRECT
ANSWER--- - if two solutions are separated by a cell membrane, particles will move from a
region of high concentration to a region of low concentration
- gases will also diffuse through the air from a region of high concentration to a region of low
concentration
How is a leaf cell adapted to carry out photosynthesis? --CORRECT ANSWER--- - the leaf has
mesophyll tissue
- the mesophyll cells contain chloroplasts which can photosynthesise
How are palisade cells adapted for photosynthesis? --CORRECT ANSWER--- - packed will
chloroplasts for photosynthesis
- tall shape means a lot of surface area exposed down the side for absorbing carbon dioxide
from the air in the leaf
- they are grouped together at the top of the leaf so that they can absorb more sunlight
How are red blood cells adapted to carry oxygen? --CORRECT ANSWER--- - concave shape gives
a big surface area for absorbing oxygen. it also helps them pass smoothly through capillaries to
reach body cells
- packed with haemoglobin which absorbs oxygen
- they have no nucleus to leave even more room for haemoglobin
How are sperm cells adapted for swimming to the egg? --CORRECT ANSWER--- - streamlined
head and flagella to help it swim to the egg
- there are a lot of mitochondria in the cell to provide the energy needed
- carry enzymes in their heads to digest through the egg cell membrane
If a cell has many mitochondria... --CORRECT ANSWER--- it must need a lot of energy, e.g.
muscle cell, sperm cell
If a cell has many ribosomes... --CORRECT ANSWER--- it is making a lot of protein, e.g. gland
cells which produce enzymes
If a cell has flagella.. --CORRECT ANSWER--- it must be able to move, e.g. sperm cells
What is the process by which cells become specialised? --CORRECT
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