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TX: Plant Reproduction Lesson

Plants Reproduce?

What kind of flower is a rose?

How do roses reproduce?

How many different kinds of roses are there?

Alternation of Generations

First, let’s take a look at the means behind plant reproduction – Alternation of Generations. Take a look at the presentation below and answer the questions that follow:

Answer the following questions addressed in the Lifecycles of Animals and Plants Interactive above to test your learning.

 Angiosperms

The Angiosperms, or flowering plants, are the most successful group of plants. They are the most abundant of all plant groups on Earth, and they occupy all habitats. We will spend some time in this lesson learning about their unique and specialized reproduction.

What Factors Affect Germination?

  1. Factor: Moisture / Water
    • Water must be absorbed to break dormancy and resume normal metabolism this is called imbibition.
  2. Factor: Temperature
    • Seeds have optimal temperature ranges for germination or require specific temperature changes to break dormancy.
  3. Factor: Oxygen
    • The seed needs access to oxygen in order to do cellular respiration and break down the seed's nutrients for energy. Waterlogged soil or being buried too deep causes oxygen starvation in seeds.
  4. Factor: Light
    • Light does not usually affect germination because seeds are underground. However, a few species in forests will not germinate unless there is an opening in the canopy above.
  5. Factor: Scarification
    • Some seeds require some physical manipulation to germinate. This is called scarification. Examples include fire, acid (passing through the gut of an animal), or soaking in water for a long time. Each method would weaken the seed coat and trigger germination.

Flowers

 

Have you ever gone to Home Depot or Pike Nursery to buy plants? Sometimes they are grouped as annuals or perennials. What does that mean?

  1. Annual plants germinate, grow, produce seeds, and die in a single growing season.
  2. Bi-annual plants germinate and grow one season but mature and produce seeds the next, then die at the end of the second year.
  3. Perennial plants germinate, grow and produce seeds every year, growing seeds for an indeterminate period of time; this may repeat for several years or hundreds of years.

Pollination

Fruit

Plant Reproduction Challenge and Before You Go

Practice Time! Use the knowledge you learned from the lesson to complete the practice activities below.

Before You Go - You Need To Know

 

The following key points are from the explore section of the lesson. You must know the following information before moving to the next lesson. This is just a summary of the key points.

  1. What is the reproductive structure of angiosperms?
    • flowers
  2. What is pollination?
    • The placement of pollen on the stigma of the carpal
  3. What are two ways pollination can occur?
    • By wind or animals

IMAGES CREATED BY GAVS (FREEPIK)