Plant Hormones and Tropisms Quiz P186

What is the main function of plant hormones?

• To coordinate and control plant responses

• To provide energy for photosynthesis

• To absorb water and minerals

• To protect plants from herbivores

What is the response of a plant to light called?

• Phototropism

• Gravitropism

• Photosynthesis

• Transpiration

Which hormone is responsible for the bending of plant shoots towards light?

• Auxin

• Chlorophyll

• Gibberellin

• Ethylene

What is the importance of auxin in plant responses?

• It controls the direction of growth by causing uneven cell growth

• It provides nutrients to the plant

• It helps in seed dispersal

• It protects the plant from diseases

How do plant roots respond to gravity?

• They grow downwards in the direction of gravity

• They grow upwards towards the light

• They grow sideways away from water

• They stop growing completely

What happens to a plant shoot when light falls on it from one side only?

• It bends towards the light

• It bends away from the light

• It grows straight upwards

• It stops growing

Which of the following best describes a tropism?

• A growth response of a plant to an environmental stimulus

• A process of photosynthesis in plants

• A method of seed dispersal

• A type of plant disease

Why do shoots and roots respond differently to gravity?

• Auxin has different effects on root and shoot cells

• Roots are exposed to more sunlight

• Shoots have more chlorophyll

• Roots absorb more water

What causes the bending of a plant shoot towards light in the diagram?

• Uneven distribution of auxin

• Equal distribution of water

• High levels of chlorophyll

• Lack of minerals in the soil

Which scientist(s) first demonstrated how a plant responds to light from one direction?

• Charles Darwin and his son Francis

• Gregor Mendel

• Isaac Newton

• Marie Curie