Sexual Reproduction in Flowering Plants

SEXUAL REPRODUCTION IN FLOWERING PLANTS

Pollination & Fertilization

LAST LESSON…

• Parts of a flowering plant

LAST LESSON…

• Pollinators

Bees Birds Bats Butterflies

OBJECTIVES

• Define pollination.

• Define fertilization and state its function.

• Describe and draw the stages of fertilization beginning with the arrival of the pollen grains at the stigma to the fusion of male cell with the female cell in the ovary.

• Apply the concept of pollination and fertilization to solve scenarios involving a defect in the pollination process or fertilization process or parts of the flowering plant. Generate a possible explanation on how the defect affects the entire pollination or fertilization process and sexual reproduction of flowering plants.

REPRODUCTION OF LIVING THINGS

• Humans and mammals give birth to young, birds and amphibians lay eggs.

• How do stationary living things like flowers reproduce?

• With the help of our mobile friends, the pollinators!

IMPORTANCE OF POLLINATORS

• How do pollinators help in the reproduction of flowering plants?

IMPORTANCE OF POLLINATORS

Image 1. Bee rubbing its hairy body against the filaments. Image 2. Bee carrying thousands of pollen grains on its hairs.

POLLINATION & FERTILIZATION PROCESS OVERVIEW

Pollination is the process by which pollen grains are transferred from the anther to the stigma.

Fertilization is the fusion of the male sex cell (in the pollen grain) and the female sex cell (in the ovule).

Function of fertilisation: For sexual reproduction

POLLINATION PROCESS

1. Pollen grains from another anther is transferred onto the stigma of the recipient flower as pollinators gather nectar for food.

Many pollen grains get stuck onto stigma’s sticky surface.

FERTILIZATION PROCESS2. Once conditions are right, pollen tubes from the pollen grains will start to grow into the style.

This will create a pathway for the pollen grain to travel down to the ovary.

FERTILIZATION PROCESS

3. Once the pollen grain reaches the ovary, the male sex cell inside the pollen grain fuses with the female sex cell inside the ovule.

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