Plants Tropisms and Photosynthesis

Roots of a weeping willow that grow towards a plentiful water source is an example of which tropism?

• phototropism

• thigmotropism

• gravitropism

• hydrotropism

What form of tropism is taking place when an ivy plant wraps itself around cable, stick, or string?

• phototropism

• thigmotropism

• gravitropism

• hydrotropism

What is the explanation of thigmotropism?

• Plant growth in response to touch.

• Root growth towards the center of gravity.

• Root growth towards water.

• Plant growth towards light.

What response causes roots to grow downward?

• thermotropism

• phototropism

• thigmotropism

• geotropism

Predict what will happen to the leaves of a healthy plant when it is placed on a sunny window sill.

• The leaves will turn towards sunlight.

• The leaves will produce flowers.

• The leaves will fall off.

• The leaves will develop stomata.

What causes a venus fly trap to close its leaves?

• loud noises

• cold air

• too much sunlight

• an insect touching it

Eventually, over time, a plant hat is knocked over grows upward, not sideways. What type of tropism is this describing?

• thigmotropism

• hydrotropism

• phototropism

• gravitropism

The tropism that makes roots grown downwards and the stems shoot up no mater the way the seed is placed is called _____________.

• phototropism

• geotropism

• thigmotropism

• hydrotropism