WATER AND SCIENCE

1. Water Plants and Animals
IVAYLO IVAYLOV

2. Before we start
This presentation contains music. Please turn your
speakers on and click the slideshow button.

3. Before we start
Water is not just the thing that keeps us alive. It is home to
many plants and animals. Continue watching to learn more
about them.

4. Content
Aquatic
plants
Aquatic
animals
Sources of
information

5. Aquatic plants
About the
aquatic plants
in brief
Distribution
Reproduction
Examples

6. About the aquatic plants in brief
• Aquatic plants are plants that have adapted to living in
aquatic environments (saltwater or freshwater);
• Aquatic plants can only grow in water or in soil that is
permanently saturated with water.

7. Distribution
• The principal factor controlling the distribution of aquatic
plants is the depth and duration of flooding;
• However, other factors may also control their distribution -
growth form, disturbance from waves, salinity, etc.

8. Reproduction
Although most aquatic plants can reproduce by flowering
and setting seed, many also have extensive asexual
reproduction by fragments.

9. Examples
Some other familiar examples of aquatic plants might
include floating heart, water lily, lotus, and water hyacinth.
floating heart
water lily
lotus water hyacinth

10. Examples
Some aquatic plants are used by humans as a food source.
Examples include wild rice, Chinese water chestnut, Indian
lotus, water spinach, etc.
wild rice Chinese water chestnut

11. Aquatic animals
About the
aquatic
animals in
brief
Characteristics
Distribution
Examples

12. About the aquatic animals in brief
An aquatic animal is an animal which lives in water for most
or all of its life.

13. Characteristics
Aquatic animals may breathe air or extract oxygen from that
dissolved in water through specialised organs called gills, or
directly through the skin.
Water with
airbreathing
whale

14. Distribution
The term aquatic can in theory be applied to animals that
live in either fresh water (fresh water animals) or salt water
(marine animals).
pink river dolphin marine dolphin

15. Examples
In addition to water breathing animals, e.g., fishes, mollusks
etc., the term "aquatic animal" can be applied to air-
breathing aquatic or sea mammals such as whales and sea
cows, which can’t survive on land, as well as to seals.
sea cow killer whales seal

16. Examples
The term "aquatic mammal" is also applied to four-footed
mammals like the river otter and beavers, although these
are technically amphibious.
river otter beaver

17. Examples
Amphibians, like frogs, while requiring water, are separated
into their own environmental classification. The majority of
amphibians have an aquatic larval stage, like a tadpole, but
then live as terrestrial adults, and may return to the water to
mate.
frog
frog’s
metamorphosis

18. Examples
Certain fish also evolved to breathe air to survive oxygen-
deprived water, such as arapaima and walking catfish.
arapaima walking catfish

19. Sources of information
8th grade biology textbook