Access Prior Knowledge

1. What happens during pollination?

2. Why is photosynthesis important to plants?

3. Describe what happens to particles when thermal energy (temperature) is increased and decreased.

Review previous outlines and write a question to ask a classmate.

Brain Pop

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DNA and Growth

Different plants have different needs, but a plant’s DNA controls when and how it grows.

DNA and the environment both affect how fast a plant grows.

TropismsTropisms are ways that plants change the direction they grow due to the environment.Growth hormone is a chemical that affects plant growth by making cells grow larger.Water can also change the size of plants when they store it in the vacuoles.

Types of TropismsGravitropism is a plant’s growth due to gravity, roots growing down but stems grow against gravity.Phototropism is how a plant reacts to light, plants bending toward light.Thigmotropism is a plant’s growth due to touching an object, vines stems grow around a post or fence.

Different Tropisms

Phototropism

Thigmotropism

Gravitropism

TextQuest

1. What are the influences that determine rate of plant growth in different types of plants ?

2. Explain how plants and plant parts grow toward light or grow upward?

3. If the Sun shines on a plant mainly from the south, in what direction will the plant grow? Why?

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