PARTS OF A PLANT
Roots -> Take in water and food (mineral
salts) from soil. Anchors plants. The roots
of a plant are spread out.
Stem -> "Like a straw", transports water
through plant. Raises the height of flowers
and leaves. Brings closer to light.
Structural. The stem is made up of little
Leaves -> Different shapes. Almost always
green but sometimes covered with another
colour such as red. Green substance in
leaves -> chlorophyll. Leaves make food for
the plant. To do this they need the water
and mineral salts obtained from the soil.
They are carried inside little veins in the
leaf. To make food leaves also need
sunshine and CO2.
Flowers - > Flowers produce seeds which
form new plants.
Space and warmth also needed for a plant
FUNCTION OF PLANT PARTS
The root is the part of the plant that takes in water and minerals for
Roots have root hairs that increase the surface area for more water
The stem has vessels that transport sap and water throughout the
Sap is a nutrient-rich fluid that contains a lot of sugar.
Two Functions of the Leaf
Photosynthesis is the process when leaf cells containing chlorophyll
take in carbon dioxide and water and using sunlight, make sugar
Transpiration is the loss of water from the leaf. This helps to draw
water up through the plant from the roots.
Upper and Lower Epidermis - protective layers on the upper and
lower sides of the leaf
Cuticle - waxy layer on the upper epidermis to reduce water loss
Palisade Cell Layer - layer without chloroplasts beneath the upper
Spongy Mesophyll Layer - layer beneath palisade layer containing
chloroplasts which photosynthesise sugars; also contains veins
carrying xylem and phloem, and many air spaces for exchange of
carbon dioxide and oxygen
Stoma (Plural: Stomata) - pores in the lower epidermis that are
surrounded by bean-shaped guard cells that contain chloroplasts.