Plants Day 2: Reproduction

Plants Day 2: Reproduction

How do Flowering Plants Reproduce?

Just like how leaves, roots, and stems are organs, flowers are organs. Flowers are sex organs of plants.

The smells they make, their colors and patterns, as well as their sweet nectar, attract pollinators (bees, bats, butterflies, etc). Some flowers are specifically male, some specifically female (eg: any that make fruit), and some are both.

How do Flowering Plants Reproduce?

Male

Female

• Stamen

• Anther

• Filament

• Pollen

• Pistil

• Stigma

• Style

• Ovary

• Ovule

How do Flowering Plants Reproduce?

Stamen is the term for the overall male parts of the flower.

• The Anther is the fluffy part that produces pollen

• The Filament is the stalk supporting the anther

• Pollen is the sperm of plants, the male sex cells

How do Flowering Plants Reproduce?

Similar to stamen, Pistil is the term for the overall female parts of the flower

• The Stigma is sticky so pollen can stick to it (aka, pollination happens here)

• The Style is a stalk that supports the Stigmata

• The Ovary is in the base of the pistil and is where fertilization happens. Seeds form here, and this part turns into a fruit that houses the seeds

• Ovules are egg cells (female sex cells)

Multiple Choice

Which part of the male plant produces the pollen?

• the filament

• the anther

• the stigma

• the style

Multiple Choice

What is the all encompassing term for the female parts of the flower

• Stigma

• Stamen

• Ovary

• Pistil

How do Flowering Plants Reproduce?

Parts that aren't exclusively male or female:
Sepals are the leaves underneath a bloomed flower that protect a developing flower bud

Petals are colorful fancy structures that help attract pollinators

Multiple Choice

What is the role of petals in a flower?

• To protect the flower bud

• To attract pollinators

• To support the flower structure

• To provide nutrients to the flower

Drag and Drop

A ​​​

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is an animal or insect such as hummingbirds, butterflies, or bees. Pollinators are attracted to flowers by the colorful petals and ​

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, a sugary sweet substance that is a great source of carbohydrates & energy (ATP). As a pollinator drinks the sweet nectar they tend to ​rub against the ​

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of a flower, collecting ​

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, which will be brushed from the pollinator onto the sticky ​

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.

Drag these tiles and drop them in the correct blank above

Nectar

Pollinator

Pollen

stigma

anther

Multiple Choice

What is fertilization?

• Homologous chromosomes forming a haploid zygote

• 4 genes forming a zygote

• 3 haploid gametes forming a haploid zygote

• 2 haploid gametes forming a diploid zygote

How do Plants get fertilized?

Fertilization is When a sperm and egg are united and form a zygote (fertilized egg cell). This happens in most eukaryotic multicellular organisms.

This helps plants develop seeds, which will eventually grow into a baby plant.

1. The pollen (plant sperm cell) moves from the sticky stigma down through a pollen tube in the style.

2. It uses an enzyme to burrow down through the style and into the ovary.

3. The sperm is deposited into the ovary.

4. When the sperm joins with an ovule (egg), fertilization has occurred and a zygote(fertilized egg cell) is formed.

5. The zygote will develop into a seed which will contain the embryo

Ok, but the apple needs to fall far from the tree eventually

Flowering plants have an added benefit that the ovary will ripen and develop into a fruit, which protects the newly developed seeds and aide in seed dispersal.

It's important that baby plants don't stay too near adult plants, or other baby plants for that matter. This ensures that competition for space, lights, nutrients, and water is kept to a minimum. When an animal eats the fruit, the seeds may pass through the digestive system unharmed (think humans and corn). In this way, the baby plants can travel a great distance from the parent plant.
Nonedible fruits may stick to animal fur or be carried by wind or water (eg: coconuts and sticky seeds!)

Hotspot

Identify where seeds are produced.

Ok, but the apple needs to fall far from the tree eventually

As for nonflowering plants (like Conifers), some of them use cones (pinecones, for example) to reproduce! Female cones are the ones you tend to think of that are covered in scales. The ovules (egg cells) are inside the scales. The wind blows pollen to fertilize the eggs The scales open (peel back) and seeds fall out to be blown by the wind or animals where they can germinate (begin to grow) into a new tree.

Labelling

Label the correct word with the correct location on the flower. (contains both reproductive organs)

Drag labels to their correct position on the image

stigma

petal

anther

ovary

sepal

style

filament

ovule