Biology Week 15- Flowers & Fruits

Day 1 | Day 2 | Day 3 | Lab | Weekly Quiz | Quizstar | Online Video's

  • Flower
  • Receptacle
  • Sepal
  • Calyx
  • Petal
  • Corolla
  • Pistil
  • Style
  • Ovary
  • Ovule
  • Stamen
  • Anther
  • Filament
  • Pollination
  • Self-pollination
  • Cross-pollination
  • Fertilization
  • Pollen grain
  • Tube cell
  • Pollen tube
  • Generative cell
  • Sperm cell
  • Zygote
  • Fruit
  • Dry
  • Fleshy
  • Simple
  • Aggregate
  • Multiple
  • Seed
  • Seed coat
  • Cotyledon
  • Radicle
  • Hypocotyl
  • Epicotyl
  • Germination
  • Seed dispersal

The Flower: an organ of sexual reproductionlink to an Internet Website

click to find the answer to today's question What part of a flower are you eating when you eat an apple?

Flowers are composed of modified leaves. Each floral structure represents a different modification of a leaf. Not all flowers have the same parts, but male and/or female structures are essential.

flower parts
the key points to useful information on this page
Parts of a flower: link to an Internet Website

Receptacle: (#6)

Sepal: (#5)

Petal: (#4)

Pistil: link to an Internet Websitethe female organ.

Stamen: link to an Internet Websitethe male organ.

Day 2

click to find the answer to today's question Bright petals on flowers attract insect pollinators. Since the flowers of grasses don't have petals to attract insects, how are they pollinated?

click for a career
Pollination: link to an Internet Websitethe transfer of pollenlink to an Internet Website from anther to stigma.
  • Self-pollination is the transfer of pollen from one flower to another on the same plant.
  • Cross-pollination transfers pollen from one plant to another of the same species.

Fertilization: the joining of sperm and egg in an ovule.

  • Before fertilization can occur, the pollen grain on the stigma has to germinate.
  • Each pollen grain contains a tube cell and a generative cell.
  • The tube cell forms a pollen tube that grows down inside the style to an ovule.
  • The generative cell divides to form two sperm that move down the pollen tube.
  • The pollen tube provides a pathway for the sperm to reach the egg cell in the ovule.
  • One sperm fertilizes the egg cell and together they form the zygote.
  • The other sperm unites with the polar bodies in the ovule and together they form the nutritive tissue for the zygote.

Day 2 Assignment - Flowers & Fruits(Test Your Concept Understanding)

  1. Explain the difference between pollination and fertilization of a plant.
  2. Using concepts of genetics,link to a local webpage explain why cross-pollination is better than self-pollination.
  3. Use this Botany Class pollination pagelink to a local webpage to answer the following questions:
    1. Many flowers are pollinated by animals. Why do animals go to the trouble to pollinate flowers?
    2. How are the flowers of a corn plant pollinated?
    3. In addition to bees and butterflies, what other animals are common pollinators of flowers?
    4. What is the scientific name of a honey bee?
    5. What are the two types of cells in a pollen grain? Explain the function of each.
  4. In a paragraph explain what a Horticultural Scientist (Horticulturist) is and does?
  5. Name 5 different courses a student must take in order to become a Horticulturist.

Day 3

click to find the answer to today's question An embryo plant and cotyledon are found inside a seed. What is the purpose of the cotyledon?

Fruit: a ripened ovary with to a local webpage

Fruit types:
  • Dry: link to an Internet Websitefruits with papery or leathery walls.
  • Fleshy: link to an Internet Websitefruits with soft, usually moist walls.
  • Simple fruits develop from one carpel or carpels that are united.
  • Aggregate fruits are formed by flowers having several separate carpels.
  • Multiple fruits are a group of many fruits formed by a cluster of flowers.
grapes are a simple, fleshy fruit
Grapes: a simple, fleshy fruit.

Seed:link to a local webpage a fertilized ovule. seed germination

Germination:link to a local webpage when a seed begins to grow into a new plant. seed dispersal

Seed dispersal: spreading of seeds away from the parent plant. Research Links:

Biology Class










When you eat an apple, you are eating the mature ovary of an apple flower.
The "core" is composed of the ovules containing the seeds.










The pollen of grasses is spread by the wind.










The seed cotyledon provides food for the embryo plant until it can grow leaves and begin producing its own food.