Plants

Plants

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Plants and osmosis

Osmosis is important in plants. They gain water by osmosis through their roots. Water moves into plant roots by osmosis, making them turgid or stiff and so then are able to hold the plant upright.

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Green plants

Absorb light energy using chlorophyll in their leaves and use it to reach carbon dioxide with water to make glucose and oxygen as a by product.

                                    (Light Energy)

Carbon Dioxide + water    ------------>   Glucose + oxygen

This process is known as photosynthesis.

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Glucose

The glucose produced if used in

  • RESPIRATION
  • OR CONVERTED INTO STARCH AND STORED

TEMPERATURE, LIGHT INTENSITY AND CARBON DIOXIDE CONCENTRATION are all LIMITING factors for photosynthesis.

Plants need Mineral IONS including NITRATE and MAGNESIUM for healthy growth. 

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Photosynthesis

Chemical change which happens in the leaves of green plants. First step towards making food. During this reaction carbon dioxide and water are converted into glucose and oxygen as a by product.

The reaction requires light energy which is absorbed by a green substance called chlorophyll.

Takes place in leaf cells. These contain chloroplasts which are tiny objects that contain chlorophyll.

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Factors limiting photosynthesis

 Three factors can limit photosynthesis from going any faster. These are light intensity, carbon dioxide concentration and temperature.  

Without enough light a plant cannot photosynthesise very fast, even if there is plenty of water and carbon dioxide. Increasing the light intensity will make photosynthesis faster.  

Sometimes photosynthesis is limited by the concentration of carbon dioxide in the air. Even if there is plenty of light a plant cannot photosynthesise if there is insufficient carbon dioxide.  

If it gets too cold the rate of photosynthesis will decrease. Plants cannot photosynthesise if it gets too hot.  

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Plants need:

CARBON  HYDROGEN  OXYGEN

Hydrogen and oxygen are from water and soil.

Carbon and Oxygen are from Carbon Dioxide and Oxygen in the atmosphere

Water and Carbon Dioxide are used to synthesis food during photosynthesis and Oxygen is used to release energy for food during respiration.

All minerals are absorbed through the roots and dissolved in the soil water.

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Plants need mineral ions because:

Nitrate -------- making amino acids which are needed to make proteins

Magnsium -------- To make chlorophyll

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not enough minerals

Deficient in nitrate ------------ Suffer from stunted growth

Deficient in Magnesium ----------- Leaves will turn yellow

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