Plant and Animals: External factors

Question 1

Biological clock

Answer 1

An organism’ natural timing devices regulate the cycle of circadian rhythms, this is an innate response/ behaviour, and endogenous.

Question 2

Circadian rhythms

Answer 2

Are physical, mental, and behavioural changes that follow a 24 hour cycle

Question 3

Factors that can impact an organisms biological clock

Answer 3

Zeitgebers
A rhythimic environemtal cue that resets an internal clock

Question 4

Endogenous

Answer 4

Having an internal clock

Question 5

Exogenous

Answer 5

Having an external clock

Question 6

Innate behviour

Answer 6

Genetically progammed

Question 7

Learned behviour

Answer 7

Results of experience

Question 8

Abiotic factors

Answer 8

Physical or non living factors
eg. light, temp, gravity

Question 9

Bitoic facotrs

Answer 9

Influence due to other organisms
eg. competition, mutulism, predatation

Question 10

Stimuli

Answer 10

Change in an organisms environment to which it can respond

Question 11

Receptor

Answer 11

A strucutre that detects stimuli

Question 12

Effector

Answer 12

A structure that carries out the response to a stimuli
eg. Cillia and flagella, muscle fibres, gland cells etc

Question 13

Sensing the enviroment flow chart

Answer 13

Stimuli - Receptor - CNS (central nervous system) - Effector - Response

Question 14

Free-running period

Answer 14

A rhythm that is free of external enviromental cue

Question 15

SCN

Answer 15

Suprachiasmatic nuclei; the site of the master clock in mammals

Question 16

Optimum range

Answer 16

Living organisms operate at an optimum range that fits their tolerance based on their species. If they are out of their optimum range they are therefore no longer in their fitted tolerance. This has the flow on effect of the organism suffering from physiological stress and if the organism is out of their fitted tolerance to the extreme it could lead to death.

Question 17

Adaptive advantage

Answer 17

Any trait that results in an organism having a greater chance of surviving to an age where it can reporduce

Question 18

Ecological niche

Answer 18

The opportunities provided by the habitat and the adaption of the organism enables it to take advantage of these opportunities. (Structural, behavioural, physiological, life history)

Question 19

Light

Prefix

Answer 19

Photo

Question 20

Temperature

Prefix

Answer 20

Thermo

Question 21

Gravity

Prefix

Answer 21

Gravi or Geo

Question 22

Chemicals

Prefix

Answer 22

Chemo

Question 23

Touch

Prefix

Answer 23

Thigmo

Question 24

Water

Prefix

Answer 24

Hydro

Question 25

Current

Prefix

Answer 25

Rheo

Question 26

Food

Prefix

Answer 26

Tropho