Survival and response (A-level only) (3.6.1.1) | AQA A-Level Biology - (7402) | KnowledgeSet

Survival and response (A-level only)

Biology · A-Level · AQA · AQA A-Level Biology - (7402) · Specification point · 3.6.1.1 · Organisms respond to changes in their internal and external environments (A-level only) · Stimuli, both internal and external, are detected and lead to a response (A-level only)

IAA and plant cell elongation

Phototropism

Gravitropism

Taxis

Kinesis

Three-neurone reflex arc

Investigating animal movement

Next Steps

Read Notes

Read clear notes for this topic.

Exam Questions

Coming soon

Flashcards

Flip through flashcards to lock it in.

Lesson

Coming soon

Ask Sage

Get help from Sage on this topic.

Learning Objectives

3.6.1.1 Survival and response (A-level only)

Content	Opportunities for skills development
$Organisms increase their chance of survival by responding to changes in their environment. In flowering plants, specific growth factors move from growing regions to other tissues, where they regulate growth in response to directional stimuli. The effect of different concentrations of indoleacetic acid (IAA) on cell elongation in the roots and shoots of flowering plants as an explanation of gravitropism and phototropism in flowering plants. Taxes and kineses as simple responses that can maintain a mobile organism in a favourable environment. The protective effect of a simple reflex, exemplified by a three-neurone simple reflex. Details of spinal cord and dorsal and ventral roots are not required.$	$AT h Students could design and carry out investigations into the effects of indoleacetic acid on root growth in seedlings.$
$Required practical 10: Investigation into the effect of an environmental variable on the movement of an animal using either a choice chamber or a maze.$

Content

Opportunities for skills development

Organisms increase their chance of survival by responding to changes in their environment. In flowering plants, specific growth factors move from growing regions to other tissues, where they regulate growth in response to directional stimuli. The effect of different concentrations of indoleacetic acid (IAA) on cell elongation in the roots and shoots of flowering plants as an explanation of gravitropism and phototropism in flowering plants. Taxes and kineses as simple responses that can maintain a mobile organism in a favourable environment. The protective effect of a simple reflex, exemplified by a three-neurone simple reflex. Details of spinal cord and dorsal and ventral roots are not required.

AT h Students could design and carry out investigations into the effects of indoleacetic acid on root growth in seedlings.

Required practical 10: Investigation into the effect of an environmental variable on the movement of an animal using either a choice chamber or a maze.