WJEC GCSE Biology 3 revision Guide (In detail)

This is a GCSE WJEC Biology 3 (triple science award) revision guide for higher tier.  I've tried to write it so that it is of genuine use for anyone doing the course (because i know that they don't do triple science revision guides -_- ). If you spot any inaccuracies please tell me because obviously I'm not 100% sure that it's all right. I hope it's useful for you :) update it's now 100% complete :)

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  • Created by: Evan
  • Created on: 01-04-13 19:57

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Page 1

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"Candidates should: understand why water is important to plants and its use in
photosynthesis, transport of minerals and support."

Plants need water for structural support, growth, photosynthesis and for the transport
of minerals.

Structural support ­ a plant consists of 90% water. The internal pressure…

Page 2

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Osmosis occurs as there is higher concentration of water outside the root than
there is inside the root, therefore water moves through the membrane into the
Osmosis' role in the movement of water through a plant ­ osmosis is an
important part of the transpiration stream (see below).

Page 3

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"Candidates should: recognise and label on a given diagram of a T.S. leaf: cuticle,
epidermis, stomata, palisade layer, spongy layer, xylem and phloem. Structure of
stomata to include guard cells and stoma. Understand that stomata can open and
close to regulate transpiration."

Diagram of a TS leaf's structure:

How the…

Page 4

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Phosphate Creates strong roots.
Potassium Creates good flowers and many seeds.
Calcium Creates strong stems.
Nitrate Creates the components to make healthy
plant cells. (E.g. stem, leaves etc.)

Effects of deficiencies in nutrients ­
1. Potassium: The leaves of the plant begin to show a yellow colour.
2. Phosphate: The…

Page 5

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White blood cell diagram -

Red blood cell
diagram -

Red blood cells ­ They contain haemoglobin. The
function of a red blood cell is to transport oxygen from the lungs to the other
parts of the body and carry carbon dioxide back to the lungs. Red blood cells

Page 6

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vessels and that the blood flows to the organs through arteries and returns to the
heart through veins. (Structure of arteries and veins is not required.)"

The muscle imbalance of the heart ­ As the distance that blood is pumped
along the systemic system is further than the distance of…

Page 7

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"Candidates should: know that in the organs blood flows through very small blood
vessels called capillaries. Substances needed by cells pass/diffuse out of the blood
to the tissues, and substances produced by the cells pass/diffuse into the blood,
through the walls of the capillaries. The thin walls of the capillaries…

Page 8

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Cornea It refracts light - bends it as it enters the eye

"Candidates should: understand that the brain, spinal cord and nerves form the
nervous system and the central nervous system consists of the brain and spinal cord."

The central nervous system ­ This consists of the brain and spinal…

Page 9

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"Candidates should: know that the kidneys regulate the water content of the blood and
remove waste products from the blood and understand why this is necessary."

Why it is necessary for the kidneys to regulate the water content of blood - The

Page 10

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"Candidates should: recognise and label a given diagram of a section through a kidney
to include: renal artery, renal vein, cortex, medulla, pelvis, and ureter. Know the
position of nephrons."

Diagram of a kidney ­

Position of the nephrons ­

"Candidates should: recognise and label a given simplified diagram of…




this is brilliant!



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