Plant Hormones: Tropisms

Plants grow towards light and water due to tropisms, which are growth responses to stimuli. Positive tropisms involve growth towards stimuli, while negative tropisms involve growth away. Phototropism is growth in response to light, and geotropism is growth in response to gravity. Stems exhibit negative geotropism by growing upwards, while roots show positive geotropism by growing downwards. Plant growth is controlled by hormones, similar to humans.

What is the primary purpose of tropisms in plants?

• To increase the plant's height

• To produce more flowers

• To enhance photosynthesis by optimizing light and water intake

• To protect plants from predators

Which type of tropism involves growth towards a light source?

• Negative geotropism

• Positive phototropism

• Positive geotropism

• Negative phototropism

How do roots typically respond to light in terms of tropism?

• They grow towards the light

• They are unaffected by light

• They grow away from the light

• They grow parallel to the light

What is the term for growth in response to gravity?

• Thigmotropism

• Phototropism

• Hydrotropism

• Geotropism

In geotropism, how do stems and roots typically grow?

• Both stems and roots grow against gravity

• Both stems and roots grow with gravity

• Stems grow with gravity, roots grow against gravity

• Stems grow against gravity, roots grow with gravity