Question

Tick [] the correct statements and cross [x] the wrong ones,
(a) There are seven classes of invertebrates.
(b) The animals which belong to annelida have tentacles
around their mouth.
c) Arthropods have jointed legs.
d) Octopus belongs to the phylum mollusca.
e) Starfish is found in fresh water only.​

Answer 1

Tick [✅] the correct statements and cross [❎] the wrong ones,

(a) There are seven classes of invertebrates.

ANSWER: ❎ NOO

• The Invertebrates unit explores six groups of invertebrates— poriferans (sponges), cnidarians (such as sea jellies and corals), echinoderms (such as sea urchins and sea stars), mollusks (such as octopuses, snails, and clams), annelids (worms), and arthropods (such as insects, spiders, and lobsters).

(b) The animals which belong to annelida have tentacles around their mouth.

ANSWER: ❎ NOO

• An earthworm is an example of annalida and they dont have tentacles around there mouth.

c) Arthropods have jointed legs.

ANSWER: ✅ YES

• The word arthropod is a combination of two Greek words - arthro meaning jointed and pod meaning foot. All arthropods have jointed legs, claws, and body segments! Arthropods have segmented bodies. Each body segment usually has a pair of appendages.

d) Octopus belongs to the phylum mollusca.

ANSWER: ✅ YES

• Octopuses, squid, and cuttlefish are all cephalopods, which are a type of mollusk. Other types of mollusk are gastropods (snails and slugs) and bivalves (clams and oysters).

e) Starfish is found in fresh water only.

ANSWER: ✅ YES

• They aren't able to live in freshwater due to the amount of calcium that they need to create their bodies.

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