U2M1L4 Reproduction of Organisms 4 - Plants

Reproduction of Organisms 4:
Reproduction and Growth of Plants

Learning Objectives:

Explore how plants
reproduce.

Describe factors that
affect probability of
successful reproduction
and growth.

Draw

circle the person you agree with

Two types of Plant Reproduction

Plants can reproduce both sexually and asexually.

Asexual reproduction happens when part of the
plant develops into a new, separate plant.

Sexual reproduction happens when a male
reproductive cell (sperm) combines with a female
reproductive cell (egg). This produces a seed.

Seedless Plants

The first land plants were seedless and grew from
spores. The lightweight spores allow for easy
spreading in the wind. Seedless vascular plants
require water for sperm motility during reproduction
and, thus, are often found in moist environments.
Examples:

MOSS FERN

In flowering plants, the female
reproductive organ is the pistil, the
male reproductive organ is the
stamen

sexual
reproduction in
flowering plants

Seed Plants

There are two groups of seed plants:
• Non-flowering
In nonflowering plants, male and female cones
exist

• Flowering
Plants produce pollen grains which contain sperm.
They also female structures that contain eggs.

Pollination occurs when pollen grains land on
female structures of the same species. If the
pollen joins with an egg, fertilization happens, and
a seed develops.

pollination explained

Knowledge check

Draw

circle the correct answer

A tropism is a response that results in plant growth towards or away
from a stimulus.

The growth of a plant toward or away from light is phototropism. A
plant has a light sensing chemical that helps it detect light.

Thigmotropism is the response of a plant to touch. Example: vine
growing up a fence.

Gravitropism is the response of a plant to gravity. Stems grow away
from gravity; roots grow towards gravity.

Genetic factors also determine how a plant grows.

What factors affect Plant Growth?

Plant parts.mp4

Draw

circle correct answer

Multiple Choice

A seed can move by wind, water, and ________.

• clouds
• singing
• cars
• animals

Multiple Choice

Seed plants use seeds to reproduce.

• True
• False

Multiple Choice

Seedless plants reproduce by

• spores
• seeds
• binary fission
• mitosis

Multiple Choice

Jamie wanted to grow tomato plants. He placed five seeds in the soil and watered them. A few days later he noticed that the seeds were beginning to break open, and a plant was emerging. What process did Jamie most likely observe?

• pollination

• fertilization

• germination

• condensation

Multiple Choice

The drawing below shows a process that is important to plants. What is most likely happening?

• The bee is bringing water to the plant.

• The plant is being pollinated by the bee

• The plant is getting nectar from the bee.

• The bee is removing insects from the plant.

Multiple Choice

the female reproductive part of a flower

• pistil

• stamen

• flowering

• non-flowerin

Multiple Choice

the pollen producing part of a flower

• pistil

• stamen

• flowering

• non-flowering

Multiple Choice

Combining of egg and sperm

• Asexual Reproduction

• Sexual Reproduction

• Diverse

• Uniform

Multiple Choice

Involves only one parent

• Asexual Reproduction

• Sexual Reproduction

• Diverse

• Uniform