Developement

Question 1

Define development

Answer 1

Series of progressive changes in form and function that occur during organisms life cycle

Question 2

When does development take pace?

Answer 2

Embryonic stage precedes birth, continues until death

Question 3

What are the key stages of development?

Answer 3

fertilisation, cleavage, gastrulation, organogenesis, morphogenesis

Question 4

How is amniote development specialised?

Answer 4

Adapted structures that allow for the movement of reproduction into dry environment, by shell and by uterus, membranes provide a life support system for further embryonic development

Question 5

What are the embryos of amniotes surrounded by?

Answer 5

Amniotic fluid, surrounded by sac called amnion membrane

Question 6

What extra embryonic membranes develop in the click?

Answer 6

Chorion, amnion, yolk sac and allantois

Question 7

What is the chorion?

Answer 7

Completely surrounds the embryo and other extraembryonic membranes, located outside the embryo. with amnion it exchanges gases between embryo and surrounding air

Question 8

What is the amnion?

Answer 8

Encloses embryo in protective, fluid filled amniotic cavity, prevents dehydration and cushions mechanical shock

Question 9

What is the allantois?

Answer 9

Functions as a disposal sac for certain metabolic wastes produced by the embryo. The membrane of the allantois functions as respiratory organ with the chorion.

Question 10

Where does fertilisation take place in mammals?

Answer 10

In oviduct

Question 11

When does life become independent?

Answer 11

Once its fully formed