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pearson edexcel igsce biology notes on plants and food, tropisms."Embark on a botanical journey and unravel the wonders of plant biology with these comprehensive IGCSE Biology notes dedicated to the fascinating realms of plants, nutrition, and tropism.£24.31
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pearson edexcel igsce biology notes on plants and food, tropisms."Embark on a botanical journey and unravel the wonders of plant biology with these comprehensive IGCSE Biology notes dedicated to the fascinating realms of plants, nutrition, and tropism.
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"Embark on a botanical journey and unravel the wonders of plant biology with these comprehensive IGCSE Biology notes dedicated to the fascinating realms of plants, nutrition, and tropism. Delve into the intricate world of flora, exploring their growth, nutrition processes, and remarkable responses ...
Plants make starch:
● storing carbohydrate
● Insoluble
● Compact
● can be broken down easily.
Test for starch:
● A drop of iodine solution is added to the starch
● It will react forming a blue-black color
Presence of starch:
● It uses carbon dioxide from the air
● It needs light
● It needs chlorophyll in the leaves
a carbohydrate made of many sugar subunits is called
polysaccharide.
Glucose is a single sugar unit called monosaccharides.
Fructose - fruits.
Glucose formula: C₆H₁₂O₆
Photosynthesis - the chemical process which produces
glucose using light.
Equation: 6CO2 + 6H2O → C6H12O6 + 6O2
, Structure and functions of leaf:
● Waxy cuticle - Protective layer prevents water from
evaporating.
● Upper epidermis - Thin and transparent to allow light to
enter, tightly packed to prevent water loss.
● Palisade mesophyll - Column shaped cells tightly
packed with chloroplast to absorb more light, used for
photosynthesis.
● Spongy mesophyll - Irregularly shaped, loosely packed
cells, less chloroplasts, gas exchange.
● Lower epidermis - Guard cells and stomata
● Stomata - Gas exchange, evaporation of water, open
during the day and closes during night, located
underside of the leaf to reduce water loss.
● Vascular bundle - Xylem and phloem to transport
substance to and from the leaf.
● Xylem - Transport water from roots to the plant.
● Phloem - Transport sucrose and amino acids around the
plant.
Factors affecting the rate of photosynthesis:
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