Plants are multicellular organisms, just like animals. They also usually contain differentiated cells, tissues and organs. Tissues The table shows some examples of plant tissues and their functions. Epidermal tissue --- Covers the plant Mesophyll --- Carries out photosynthesis Xylem and phloem --- Transport of substances around the plant
Organs Examples of plant organs include: Roots Stems Leaves Leaves Leaves are adapted to absorbing sunlight for photosynthesis.
Adaptations of a leaf:Chlorophyll ---- To absorb sunlightLarge surface area ---- To absorb more lightStomata ---- To let carbon dioxide diffuse into the leafThin ---- Short distance for carbon dioxide to diffuse into leaf cellsNetwork of veins ---- To support the leaf and transport water and carbohydrates
The leaf You should be able to describe the internal structure of a leaf.Adaptations:
Thin, waxy cuticlemade of wax - To protect the leaf without blocking out lightThin, transparentepidermis - To allow more light to reach the palisade cellsLayer of palisade cells on the top surface - To absorb lightMany chloroplasts in the palisade cells - To increase absorption of light Spongy mesophyllinside the leaf - Air spaces allow carbon dioxide to diffuse through the leaf, and increase the surface area
Organs in a plant
The Leaf
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