Vertebrea reproduction

Question 1

Why do organisms reproduce?

Answer 1

To ensure continuance of existence of a certain specie.

Question 2

What are the 2 reproductive strategies?

Answer 2

r - strategy
K - strategy

Question 3

compare r to K strategy.

Answer 3

r – strategy
Uses more energy in reproduction
Produces many offspring’s at a time
Offsprings often die before adulthood

K – strategy
Uses less energy in reproduction
Produces few offspring’s at a time
Ofsprings survive until adulthood

Question 4

What is fertilization?

Answer 4

process where sperm fuses with an egg to form a zygote.

Question 5

2 types of fertilization.

Answer 5

external and internal

Question 6

explain external fertilization.

Answer 6

happens outside female boy, used mainly in aquatic habitats, gametes are released into water to prevent drying out, pheromones released by female to attract male indicating sexual maturity, many gametes released to increase chance of fertilization, chemotaxis is secreted by eggs to attract sperm.

Question 7

what are copulatory organ?

Answer 7

organs used to transfer sperm into female, eg. penis

Question 9

what’s copulation?

Answer 9

sexual intercourse, act of inserting sperm into female by use of copulatory organ like the penis.

Question 10

3 types of embryo development:

Answer 10

Ovipary, ovovipary and vivipary.

Question 11

Table differentiating between Ovipary, ovovipary and vivipary.

Question 12

2 Development strategies?

Answer 12

precocial and altricial.

Question 13

what are these strategies relating to?

Answer 13

food supply and protection against predation

Question 14

explain precocial development.(4)

Answer 14

• youngs are fully developed and mobile when hatched
• few offsprings
• most energy expended prenatal
• very little parental care required

Question 15

explain altricial development.(4)

Answer 15

• youngs are not fully developed or mobile when hatched/born
• many offsprings
• most energy expended postnatal
• a lot of parental care required