Plant structures and flower parts

mcarothers

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Slide 1:

Plant Structures

Slide 2:

Structures for Survival Plants have structures that allow them to survive in their habitats when the conditions are not suitable .

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Examples of parts of flowering plants that function for survival are: Leaves function as the site of photosynthesis, respiration, and transpiration in plants.

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Stems support the plant and hold the leaves up to the light. Stems also function as food storage sites.

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§ The xylem in the stems transports water from the roots to the leaves and other plant parts. § The phloem in the stems transport food made in the leaves to growing parts of the plant.

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· Roots help anchor the plant in the ground.

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They also absorb water and nutrients from the soil and store extra food for the plants.

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§ The more surface area on the root that is available, the more water and nutrients it can absorb. § Root hairs help to increase this surface area.

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There are two types of roots: fibrous roots and taproots. Fibrous roots consist of several main roots that branch off to form a mass of roots. Examples are grass , corn , and some trees.

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· Taproots consist of one large, main root with smaller roots branching off. Examples are carrots , dandelions, or cacti.

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Flowers

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The flower is the reproductive structure in flowering plants.

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Flowers · Flowers produce seeds .

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· Many flowers contain both male and female parts needed to produce new flowers.

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· Flower petals are often colorful or have a scent to attract insects and other animals.

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pollen grains pollen tube petal sepal anther filament stamen stigma style ovary pistil ovules

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Stamen · The male part of a flower that has an anther on a stalk ( filament ). · The anther produces the pollen that contains the sperm cells.

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Pistil The female part of the flower that contains The ovary , which contains the ovules where the egg cells are produced, the stigma, which is the sticky top where pollen grains land, and the style, which is a stalk down which the pollen tube grows after pollination has taken place ---ovary

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Seed · The ovule that contains the fertilized egg (embryo) from which new plants are formed.