How Do Plants Grow Biology 11.

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Presentation transcript:

How Do Plants Grow Biology 11

What Elements Do Plants Require? Nitrogen: plants use nitrate. In DNA and protein molecules of a plant. Also allows chlorophyll development (green colour) Phosphorous: Assists with the flower and root development. Part of DNA strand as well Potassium: help plant to retain water. Also helps with pest resistance Calcium: help in the development of cell wall. Also aids in the uptake of nitrate

What is Primary & Secondary Growth? Primary Growth of a plant is growth in root depth and height of plant Primary growth is the result of apical meristem division Root apical meristem – in roots to grow down Shoot apical meristem – at tips of branches to grow up Meristem tissue produces AUXIN (plant hormone), which signals the apical meristem to go through repeated mitosis

What is Primary & Secondary Growth? Secondary Growth of a plant is growth in width of the stem Lateral meristem go through mitosis Vascular cambium Cork cambium

What is the structure of the root? Primary Growth Region of primary growth Root cap protects the apical meristem as it pushes through the soil Root hairs help increase surface area for higher water absorption

What is the structure of the shoot? Primary Growth Region of primary growth Leaf primordium protects the meristem tissue Allows the tree branches to grow up (length and height)

How can we see secondary growth?

Scientists use secondary growth to learn about climates of the past Thick light ring tells scientists that it was a very wet spring Thick dark ring tells scientist that it was a mild fall Forest fire scars are visible in the growth