Organs in animals: Tissues consist of groups of similar cells. Organs contain different tissues, working together to carry out particular functions. Organ systems contain different organs. The different organ systems work together in an organism.
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Organs are made of tissues. A particular organ may contain several different tissues. Such as the stomach which contains: Muscular tissues, Glandular tissues and Epithelial tissues.
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Organ systems are groups of organs that carry out a particular function. The human body has several organ systems, including: The nervous system, The respiratory system, The reproductive system and The digestive system.
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Plants are multicellular organisms, just like animals. They also usually contain differentiated cells, tissues and organs. Epidermal tissue which covers the plant. Mesophyll carries out photosynthesis. Xylem & phloem take substances around the plant.
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Thin, waxy cuticle-To protect the leaf without blocking out light. Thin, transparent epidermis-To allow more light to reach the palisade cells. Layer of palisade cells on the top surface- To absorb light.
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Green plants absorb light energy using chlorophyll in their leaves. They use it to react CO2 with water to make a sugar called glucose. The glucose is used in respiration, or converted into starch & stored. Oxygen is produced as a by-product.
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Without enough light, a plant cannot photosynthesise quickly, even if there is plenty of water & CO2. Increasing the light intensity will boost the speed of photosynthesis.
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If it gets too cold, the rate of photosynthesis will decrease. Plants cannot photosynthesise if it gets too hot.
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Use: Some glucose is used for respiration to release energy & used to produce: Cellulose - which strengthens the cell wall. Proteins - such as enzymes & chlorophyll. Plants also need nitrates to make proteins & are absorbed from soil as nitrate ions.
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The physical factors that may affect organisms include: Temperature, Amount of light, Availability of water, Availability of nutrients, Availability of oxygen and carbon dioxide.
