Plants Sensory Systems and Hormones (yes, plants have hormones too!) Ms. Bush Plants and Photosynthesis.

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Presentation transcript:

Plants Sensory Systems and Hormones (yes, plants have hormones too!) Ms. Bush Plants and Photosynthesis

Outline for today Seedling development Plants and light Plant tropisms Plant hormones Quiz

Double fertilization Grains of pollen fall on the stigma. The pollen grains grow down the style into the ovary. The pollen grains (microspores) meet up with the megaspores in the ovule. Microspores fertilize the megaspores. One microspore unites with an egg nucleus and eventually develops into a complete plant. The other microspore unites with two polar nuclei and develops into food for the plant, often in form a fruit.

Double fertilization = a plant + food

Seedling Development

Plants bloom based on the amount of uninterrupted darkness Freeman Biological Science 2 ed.

Plant Tropisms Phototropism Gravitropsism Thigmotropism

Phototropism

Gravitropism

Thigmotropism

Plant Hormones Functions of Plant Hormones Hormone Function GibberellinsPromotes stem elongation, CytokininsPromotes cell division and differentiation EthyleneInduces leaf abscission and promotes fruit ripening Abscisic acidInhibits leaf abscission and promotes bud and seed dormancy AuxinsPromote plant growth and phototropism