Bio 20, Unit 2, Part 1 & 2 *FINAL* Flashcards Preview

School > Bio 20, Unit 2, Part 1 & 2 *FINAL* > Flashcards

Flashcards in Bio 20, Unit 2, Part 1 & 2 *FINAL* Deck (29):
0

Define ecology

The relationships among organisms (biotic), and between organisms and their environment (abiotic).

1

Define biotic

Living parts of the biosphere (organisms)

2

Define abiotic

Non-living parts of the environment (light, soil, water, air, rock)

3

What is a trophic level?

Each step in the transfer of energy and matter in a community

4

Define scavenger

Consumers that feed on the tissues of dead organisms

5

Define decomposers

Organisms that feed on and break down organic matter (bacteria and fungi)

6

Define biomass

The total mass of a population of an organism in an area

7

What are the three main biochemical cycles?

1) water cycle
2) carbon and oxygen cycle
3) nitrogen cycle

8

Define bio magnification

The increase in the concentration (amount) of a substance as it moves up through the trophic levels in the food chain.

9

What percentage of energy is lost to daily activities?

90%

10

Define steady state/ homeostasis

A state of balance

Energy is continually supplied and matter gets recycled

11

Define population

A group of individuals of the same species, in a specific area, at a specific time.

12

Equations for density

N
D S

13

Define density

The number of individuals per unit of space that they occupy

14

Define Rate of Population Change

How fast the population id changing with respect to time.

15

Rate of Population Change equation

Rate of

16

What are the 4 determiners of population size?

Natality
Mortality
Immigration
Emmigration

17

Define limiting factors

Any condition of the environment (living or non living) that limits the size or a population.

18

Formula for population size using the 4 determiners.

(pop2-pop1) divided by (time2-time1)

19

What are the 3 main mortality patterns?

Late Death
Early Death
Moderate Death

20

What are the 7 main limiting factors?

Predators(b)
Climate(a)
Disease (bacteria/viruses) (b)
Water (a)
Pollution (a)
Competition for food (b)
Parasites (b)

21

What is the reproductive strategy for late death?

Have few offsprings at a time and care for them until maturity.

22

What is the reproductive strategy for early death?

Have many offsprings (100s) at a time and provide no care.

23

What is the reproductive strategy for moderate death?

Have a medium number of offspring (10s) and may provide little or no care.

24

What is exponentially/j-shape?

Population growth at an increasing rate

25

Define carrying capacity

The maximum number of individuals an area can support.

26

What growth pattern is a natural population that reaches a carrying capacity?

S-shaped

27

Define population cycle

When fluctuation occurs regularly in a pattern (predictable)

28

Describe a a population in a closed environment.

1) j-shaped: lots of food and space
2) s-shape: reached carrying capacity limited food and space
3) fluctuates to extinction