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B.6 ­ INHERITANCE & VARIATION




BIOLOGY
Light microscopes ­ used in schools to magnify things several hundred times

Electron microscopes ­ used by scientists to magnify more than a hundred thousand times


Mitochondria




Ribosomes




Cytoplasm ­ a liquid gel in
which most of the
chemical reactions
Nucleus-controls all the needed…

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B.6 ­ INHERITANCE & VARIATION

Plants make their own food through photosynthesis and do not move their own bodies about. Plant cells have:

- A CELL WALL MADE OF CELLULOSE ­ strengthens the cell and gives it support

Many (but not all) have:

- CHLOROPLASTS ­ found in all green…

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B.6 ­ INHERITANCE & VARIATION CONE CELL FROM HUMAN EYE



FAT CELL




They are STORAGE CELLS; excess fat is used to
fill up the cell. They help animals to survive
when food is in short supply. 3 main
Are in the LIGHT SENSITIVE LAYER OF THE EYE
adaptations:
(retina). They…

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B.6 ­ INHERITANCE & VARIATION

In plants, photosynthetic tissues make food by photosynthesis while storage tissues
store any extra food made by starch

In many bigger living organism, several tissues work together to do particular jobs. They form ORGANS, like the
heart, kidneys of the leaf. Different organs are combined…

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B.6 ­ INHERITANCE & VARIATION

Rates of diffusion:

If there is a big difference in concentration, diffusion will take place a lot quicker. When a substance is moving from a
higher concentration to a lower concentration, the movement towards the less concentrated one will appear to be
quite low. Although…

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B.6 ­ INHERITANCE & VARIATION

Cell ­ basically some chemicals dissolved inside a partially permeable bag of cell membrane. The cell has a fairly
concentrated solution of salts and sugars. Water will move from a high concentration of water particles to a less
concentrated solution of water particles across the…

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B.6 ­ INHERITANCE & VARIATION

PHOTOSYNTHESIS
Plants make their own food through photosynthesis. It takes place in the GREEN PARTS (esp. The leaves) when it's
light




The cells in the leaves of a plant are full of chloroplasts, which contain a green substance called chlorophyll.

Photosynthesis:

Light energy is absorbed…

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B.6 ­ INHERITANCE & VARIATION

Key points:

Photosynthesis can be summed up by this equation: carbon dioxide + water [+light energy]-> glucose +
oxygen
During photosynthesis light energy is absorbed by the chlorophyll in the chloroplast. It is used to convert
carbon dioxide and water into sugar (glucose). Oxygen is…

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B.6 ­ INHERITANCE & VARIATION

HOW PLANTS USE GLUCOSE
Some of the glucose produced is immediately used by the cells. They use it for respiration and to provide energy for
cell functions, growth and reproduction.

RESPIRATION:

Plant cells respire all the time. They break down glucose using oxygen to provide…

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B.6 ­ INHERITANCE & VARIATION

cytoplasm and the membranes. Glucose and starch are made up of carbon, hydrogen and oxygen. Proteins are made
up of amino acids which contain carbon, hydrogen, oxygen and nitrogen. Plants need NITRATES from the soil to
make proteins. The nitrates are dissolved in water and…

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Conor Murphy

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Will you be able to post Additional Science Chemistry AQA Notes? Your resources are very helpful!

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