extra questions Flashcards
1
Q
What is a tropism
A
A growth movement of plant in response to a stimulus
2
Q
An impulse down the sympathetic nerve will have what effect on heart rate
A
Increase
3
Q
What 3 factors affect the speed of a nerve impulse
A
The myelin sheath
The diameter of the axon
temperature
4
Q
What 3 purposes does the refractory period have
A
Ensures an action potential is propagated in one direction only
it produces discrete impulses
limits the number of action potentials
5
Q
Mutualistic Bactria are what?
A)heterotrophs
B)chemoautotrophs
C)photoautotrophs
A
A&C
6
Q
Denitrifying Bactria are?
A)heterotrophs
B)chemoautotrophs
C)photoautotrophs
A
A
7
Q
What is meant by the term community
A
A group of all the species present in an area
