The Timing Of Angiosperms

Question 1

Darwin angiosperm quote

Answer 1

‘The suddenness of the angiosperm appearance and their rapid rise to dominance in the fossil record was a perplexing phenomenon and abominable mystery’

Question 2

When did angiosperms evolve?

Answer 2

Early Cretaceous epoch around 145 million years ago

Question 3

5 characteristics of angiosperms

Answer 3

1. Stigmatic pollen germination
2. Stigma/style/ovary (carpel)
3. Seeds enclosed in carpel
4. Carpel becomes the fruit
5. Ovules bitegmic

Question 4

Stigmatic pollen germination

Answer 4

Stigma provided a structurally and chemically suitable medium for pollen germination

Question 5

Ovule bitegmic

Answer 5

An ovule with two integuments (outer layer of ovule which develops into seed coat as ovule matures after fertilisation)

Question 6

Monosulcate pollen

Answer 6

Pollen grain with one groove or furrow

Question 7

Tricolpate pollen (eudicot)

Answer 7

Pollen grain with three apertures (three areas in the wall where it’s slightly thinner)

Question 8

Dicotelydon

Answer 8

Flowering plant with an embryo that has two coteydons

Question 9

Cotelydon

Answer 9

Embryonic leaf which helps supply nutrition

Question 10

Monocotyledon

Answer 10

Seeds of angiosperms which have one cotelydon

Question 11

Eudicots

Answer 11

Claude of flowering plants that have two seed leaves upon germination