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Hello boys and girls. Welcome to a new natural science unit. Unit number three

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Invertebrates

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Remember from last year that

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Invertebrates are those animals which do not have a backbone and a skeleton

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inside of them

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Lesson number one

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vital functions of

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Invertebrates

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Invertebrates

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perform three vital functions

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one

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nutrition to

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reproduction three interaction

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Vital function number one nutrition

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Carnivores

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Spiders and dragonflies only eat other animals

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Herbivores

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Grasshoppers only eat plants

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Omnivores

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Ladybugs or snails eat both animals and plants

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Invertebrates

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What type of animals are these in terms of nutrition?

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Spiders are

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Carnivores

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Ladybugs are

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Omnivores

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Grasshoppers are

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Herbivores

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Snails are

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Omnivores

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Dragonflies are carnivores

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Vital function number two

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reproduction

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reproduction one

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all

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invertebrates are

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oviparous animals

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They lay eggs

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Some are also

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oviviparous animals that means that the eggs

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Grow inside their bodies and they hatch

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Before or after they lay them

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For example in beetles, aphids or flies

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Reproduction two types of reproduction

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Sexual reproduction

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Or

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Asexual reproduction

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In

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sexual reproduction a male and female are

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necessary to create a new organism

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The offspring or baby may be different from the parents

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Type B or 2

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asexual reproduction

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One organism makes an identical copy of itself

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In this case the offspring or baby is

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identical to the parent

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We are going to learn two types of asexual reproduction

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first

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budding

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The new organism grows in the parent's body and then

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separates

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Let's see the steps

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Reproduction in hydra by budding

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One we have a parent hydra

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two

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We can see that here a bud is developing

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Three we have a new bud

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Four we have a new hydra separated from the parent

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the second type of

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asexual reproduction is known as

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fragmenting. In this case one part of the parent is broken and separated first and then

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two new

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organisms start to grow from the different parts

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As we can see in this example the reproduction in a starfish by

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fragmenting we have a starfish a parent it breaks in two and from each part

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It starts to grow a full starfish and then we have two

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identical organisms

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Vital function number three is

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Interaction

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Interaction one

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All animals

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interact with the environment

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Most invertebrates live in groups or large communities

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For example hermit crabs are very social and they live in big groups

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On the other hand bees live in beehives

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forming large communities

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Interaction number two

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Most invertebrates have

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sense organs

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Do you remember the five senses?

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Okay, for example

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octopuses use

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six arms and two legs

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to eat and move around

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on the other hand the orchid mantis uses camouflage to attract and

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hide from its prey

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before she hunts it

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For example crickets or cicadas use sounds

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to warn from a danger or attract the opposite sex

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for sexual reproduction

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On the other hand

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snappy shrimps use their claws to snap noise and avoid

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predators

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That's all for today. Thank you very much for listening

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You