4. parental investment

Question 1

compare sperm and egg

Answer 1

Sperm has large number of gametes and small energy store. Egg has small number of gametes and large energy store

Question 2

which gender invest most?

Answer 2

Greater investment by females

Question 3

cost and benefit of parental investment

Answer 3

Parental investment is costly but increases the probability of production and survival of young

Question 4

classification of r-selected

Answer 4

Size - small with short lifespan
Generation time - short
Maturation speed - quick
Amount of reproduction - often only once
Number of offspring produced - large amount of small offspring
Level of parental care - limited
Energy input by parents - small
Offspring survival probability - low

Question 5

classification of K - selected

Answer 5

Size - large with long lifespan
Generation time - long
Maturation speed - slow
Amount of reproduction - multiple times
Number of offspring produced - small amount of large offspring
Level of parental care - high
Energy input by parents - large
Offspring survival probability - high

Question 6

where does r and K selection occur

Answer 6

r-selection tends to occur in unstable environments where the species has not reached its reproductive capacity, whereas K-selection tends to occur in stable environments

Question 7

costs of external fertilisation

Answer 7

Few offspring survive

Question 8

benefits of external fertilisation

Answer 8

Large numbers of offspring produced

Question 9

costs of internal fertilisation

Answer 9

Suitable mate must be found which requires energy expenditure

Question 10

benefits of internal fertilisation

Answer 10

Offspring can be retained internal for protection