Taxonomy- Animal World (classification)

Question 1

What are animals?

Answer 1

• ONLY ONES WITH NERVOUS SYSTEM.
• holozoic
• heterotrophs
• multicellular organisms

Question 2

What are Marine animals?

Answer 2

Live in salt waters.

Most of the sponges, coelenterates, chondrithyes (cartilaginous fishes).

Question 3

What are fresh water animals?

Answer 3

Live in salt free water.

Spongilla (fresh water sponge), Hydra (fresh water coelenterate), ostichthyes (bony fishes).

Question 4

Whats the difference between pelagic and benthic organisms?

Answer 4

Pelagic - live in free waters like zooplankton ( Daphnia, cyclops, orthopod larvae) and necktons (fishes, whale, dolphin, penguins, turtles).

Benthic - bottom dwellers like starfish, brittle star, devil fish(octopus).

Question 5

Name and give examples of terrestrial types of animals?

Answer 5

Cursorials: fast runners, use legs for walking like horse, cheetah, cockroaches.
Fossorial: live in burrows like snakes
Scansorials: cling to walls or hang from ceiling like Hemiductylus (wall lizard).
Arborials: live on trees like monkeys, langoons, squirrels.
Aerials: most of the time in flight like birds, most of the insects.

Question 6

Archenteron is the future
1️⃣Mouth 
2️⃣Anus 
3️⃣Alimentary canal
4️⃣Both 1 and 2

Answer 6

Alimentary canal

Question 7

Blastophore forms future
1️⃣Mouth 
2️⃣Anus
3️⃣Alimentary canal 
4️⃣Both 1 and 2

Answer 7

Future mouth or anus

Question 8

Name few diploblastic phylum.

Answer 8

Sponges, coelentrata, ctenophora

Question 9

Name some phylas with triploblastic organisms.

Answer 9

Platyhelmintha onwards

Question 10

What is coelom?

Answer 10

Its a body cavity lined by mesoderm.
OR
cavity b/w body wall and alimentary canal

Question 11

What are acoelomates. Give examples

Answer 11

Animals where, mesoderm does not enclose a cavity i.e mesoderm is solid.
for example Platyhelminthes ( flat worms).

• but actually they’re not for they dont have mesoderm.

Question 12

What are coelomates. Give examples.

Answer 12

Animals where, Mesoderm lines a cavity i.e animals with presence of coelom.
for example Annelida onwards.

Question 13

Shizocoelomates are animals where
1️⃣Splitting of mesoderm gives rise to coelom
2️⃣Encapsulation of mesoderm give srise to coelom

Answer 13

Option 1
Where Splitting of mesoderm gives rise to coelom.
for example: annelida, arthopoda, mollusca.

Question 14

Enterrocoelomates are the animals where
1️⃣Splitting of mesoderm gives rise to coelom
2️⃣Encapsulation of mesoderm give srise to coelom

Answer 14

Option 2.

Encapsulation of mesoderm give srise to coelom

Question 15

What are pseudo coelomates?

Answer 15

Animals with pseudocoelom (mesoderm in the form of scattered pouches OR mesoderm doesn’t line a cavity).

for example Aschehelmithes like ascaris

Question 16

Name few asymmetrical organisms?

Answer 16

Sponges, pilla(apple snail 🐌)

Question 17

Name a spherically symmetrical organism.

Answer 17

Volvox (unicellular algae)

Question 18

Conditions to b called as spherically symmetric are?

Answer 18

When the body can b divided into 2 halves by any plane = spherical symmetry :
▪️Spherical in outline.
▪️No oral and aboral ends
▪️No lateral margins.

Question 19

Conditions to b called radially symmetric?

Answer 19

Body is divided into 2 equal halves by any plane passing through the centre=radially symmetric:
▪️Body must b spherical, cylindrical or radiating( spread over different axes like in starfish).
▪️Must have oral and aboral ends.
▪️No right or left halves.

Question 20

Name few radially symmetric organisms

Answer 20

Coelentrates, ctenophore*, some sponges like bath 🧽 sponge, adults of echinoderm.

Question 21

Bi radially symmetric organism are

Answer 21

Radial symmetry in which org. can b divided into 2 equal halves.
E.g., Sea anemone (Adamsia) and Ctenophora*.

Question 22

Bi laterally symmetric organisms are

Answer 22

Animals with 
✔️Elongated body
✔️Oral and aboral ends
✔️Right and left halves
✔️And can b divided into 2 identical halves by a plane(saggital) passing thru the centre of the body.

Question 23

Which one is the most advanced symmetry 
1️⃣Radial 
2️⃣Biradial 
3️⃣Spherical 
4️⃣Bilateral

Answer 23

4️⃣Bilateral symmetry… bcz its the symmetry displayed by chordates.

Question 24

Bilateral symmetry is shown by

[NEET]

Answer 24

Platyhelmintha onwards except echinodermata*

[*where the adults show radial (primitive) symmetry and the larvae show bilateral (advanced) symmetry.]

Question 25

Choose the correct statement:
All protostomes are schizocoelomates except Aschehelmintha (pseudo coelomates).
All the deutrostomes are enterrocoelomates.

Answer 25

Both are correct.
All protostomes are schizocoelomates except Aschehelmintha (pseudo coelomates).
All the deutrostomes are enterrocoelomates.

Question 26

Protostomic organisms are the ones where

Answer 26

Mouth develops first (blastophore develops into mouth).

for example Aschihelmintha, annelida, arthropoda, mollusca.

Question 27

Deutrostomic organisms are the ones where

Answer 27

Anus develops first i.e embryonic blastophore develops into anus.
for example echinodermata, hemichordata, Chordata.

Question 28

Incomplete digestive system is found in

Answer 28

Platyhelmintha.

In which alimentary canal has a single opening i.e mouth [ncert]