Response to Stimuli - Yr 2

Question 1

Taxis

Answer 1

A simple response whose direction is determined by the direction of the stimulus

Question 2

Kinesis

Answer 2

A non-directional response to a stimulus which brings about increased random movements

Question 3

Tropism

Answer 3

A growth movement of a part of a plant in response to a directional stimulus

Question 4

IAA

Answer 4

Indoleacetic acid (IAA) is an auxin – a plant growth factor which is produced in small quantities. It controls plant cell elongation. It causes elongation of shoot cells but inhibits elongation in root cells.

Question 5

Plant growth factors

Answer 5

Hormone-like substances which control plant responses to external stimuli. They exert their influence by affecting growth and they may be made by cells located throughout the plant rather than in particular organs. They can affect the tissues that release them. eg indoleacetic acid (IAA)

Question 6

Photo-

Answer 6

A prefix meaning light

Question 7

Geo-

Answer 7

A prefix meaning gravity

Question 8

Chemo-

Answer 8

A prefix meaning chemical

Question 9

Rheo-

Answer 9

A prefix meaning movement