chemicals released by plants that regulate their growth

control the growth of plants by promoting cell division and elongation in plant cells

a plant growth response to a stimulus, it can be positive (towards) or negative (away from)

a plant growth response towards or away from light

a plant growth response towards or opposite the direction of gravity

Auxins, phototropism and gravitropism

Biology

The effect of light on the growth of seedlings: practical

Pupils will learn about uses of gene technology in medicine, such as for genetic testing, and in agriculture, such as the production of genetically engineered crop plants with desirable characteristics.

Pupils learned about the roles of hormones in human reproduction, including control of the menstrual cycle, and other uses of hormones such as in in contraception.

This unit covers the role of plant hormones like auxins, gibberellins, and ethene in growth and development, including phototropism and gravitropism. It explores their commercial uses and focuses on experiments, data analysis, and presenting scientific explanations.

Plant growth and development

Enable plants to respond to some environmental factors.

{{}} are growth responses to stimuli in plants that provide a survival advantage.

Auxins build up on the shaded side of roots, causing them to bend towards light.

Shoot cells are stimulated by auxins and so will elongate.

Auxins build up on the shaded side of shoots, causing them to bend towards light

Root cells are stimulated by auxins and so will elongate.

When discussing tropisms, select the correct statements.

Which tropism is the plant root below displaying?

Light coming from the left side and auxin on the left side of the shoot.

Light coming from the right side and auxin on the right side of the shoot.

Light coming from the top and auxin on the right side of the shoot.

Light coming from the left side and auxin on the right side of the shoot.

Light coming from the right side and auxin on the left side of the shoot.

Which direction is light coming from and which side of the shoot is auxin most abundant?

What happens if the tip of a shoot is covered with an opaque material?

True or false? Only animals have hormones.

What is the process by which plants make their own food?

provides support and contains tissues that transport sugars and water

Match the parts of this plant to their description.

What is the name of the tissue in plants where cells grow and elongate?

Which of the following is true about hormones?

Auxins, phototropism and gravitropism

Lesson outcome