Embryo development in Angiosperms

Question 1

Double fertilization: The pollen tube grows if…

Answer 1

Pollen and stigma are compatible

Question 2

Double fertilization: 2 haploid sperm release, produced via…

Answer 2

Mitosis of cell in pollen

Question 3

Double fertilization: What produces a zygote?

Answer 3

First sperm nucleus fuses with egg nucleus

Question 4

Double fertilization: What produces 3n endosperm?

Answer 4

Second sperm nucleus fuses with 2 nuclei of central cell

Question 5

Seed development, endosperm: What forms multinucleate cells?

Answer 5

Multiple nuclear divisions. After, cytokinesis divides nuclei into individual cells.

Question 6

Seed development, embryo: First establishes…

Answer 6

Polarity (apical - shoots, basal - roots pattern)

Question 7

Seed development, embryo: Second establishes…

Answer 7

Radial pattern of tissues

• Epidermis (exterior)
• Ground tissue (most plant tissue)
• Vascular tissue

Question 8

Seed development, embryo: Third establishes…

Answer 8

Primary meristems (producing specific tissues and organs)

• Procambrium (xylem, phloem -vascular tissues)
• Shoot Apical Meristem
• Root Apical Meristem

Question 9

When embryo is mature, seed development stops and ??? develops

Answer 9

Seed coat.