Topic 2 Plants: Flower Structure

Question 1

• Attract animals to achieve pollination

Answer 1

Petals

Question 2

• Male plant sec organ
• Composed of anther (site of microspore formation) and filament (supports anther)
  a. Microspore undergoes mitosis to form generative cell (contains sperm) and tube cell which combine to form pollen

Answer 2

Stamen

Question 3

• Female plant sex organ

- Composed of stigma (top), style (tube leading to ovary), and ovary (contains ovule or egg)

Answer 3

Pistil

Question 4

• Pollen lands on stigma -> tube cell elongates down style forming pollen tube -> generative cell travels down pollen tube to ovary -> splits forming two sperm cells (double fertilization)
  a. One sperm cell meet ovule to form the seed or embryo. Ovary develops into fruit, which is eaten by animals and deposited in new location (gene migration)
  b. The other sperm cell combines with ovule’s polar nuclei to form the endosperm

Answer 4

Fertilization