Animal kingdom

Question 1

Any plane that passes through the centre does not divide them into equal halves

Answer 1

Asymmetry

Question 2

When
any plane passing through the central axis of
the body divides the organism into two identical
halves, it is called

Answer 2

Radial symmetry

Question 3

Where the body can be divided into identical left and
right halves in only one plane.

Answer 3

Bilateral symmetry

Question 3

Animals in which the cells are arranged in two
embryonic layers, an external ectoderm and
an internal endoderm, are called

Answer 3

Diploblastic

Question 4

Those animals in which the developing embryo has a third germinal layer,
mesoderm, in between the ectoderm and endoderm, are called

Answer 4

Tripoblastic

Question 5

The body cavity, which is lined
by mesoderm is called

Answer 5

Coelom

Question 6

Animals
possessing coelom are called

Answer 6

Coelomates

Question 7

Such a body cavity is called
pseudocoelom and the animals possessing them
are called

Answer 7

Pseudocoelomates

Question 8

The animals in
which the body cavity is absent are called

Answer 8

Acoelomates

Question 9

in earthworm, the body shows this pattern called metameric segmentation and the phenomenon is known as?

Answer 9

Metamerism

Question 10

is a mesodermally derived rod-like structure formed on the
dorsal side during embryonic development in some animals

Answer 10

Notochord

Question 11

Animals with
notochord are called

Answer 11

Chordates

Question 12

those animals which do not form this structure (no notochord) are called

Answer 12

Non-chordates

Question 13

Members of phylum porifera are known as

Answer 13

Sponges

Question 14

They are generally marine and mostly
asymmetrical animals

Answer 14

Sponges

Question 15

Sponges have a water
transport or canal system. Water enters through
minute pores

Answer 15

Ostia

Question 16

Water enters through
minute pores (ostia) in the body wall into a central
cavity, spongocoel

Answer 16

Spongocoel

Question 17

Water enters through
minute pores (ostia) in the body wall into a central
cavity, spongocoel, from where it goes out
through the

Answer 17

Osculum

Question 18

Blank or collar cells line the spongocoel and the canals.
Digestion is intracellular

Answer 18

Choanocytes

Question 19

The Sponge body is supported
by a skeleton made up of

Answer 19

Spicules

Question 20

Sexes are not separate
i.e., eggs and sperms are produced by the same
individual.

Answer 20

Hermaphrodite

Question 21

reproduce asexually by
fragmentation and sexually by formation of
gametes.

Answer 21

Sponges

Question 22

They are aquatic, mostly marine, sessile or free-swimming, radially
symmetrical animals

Answer 22

Phylum Coelenterata (cnidaria)

Question 23

is derived from cnidoblasts or cnidocytes (which contain the stinging capsules or
nematocysts) present on the tentacles and the body

Answer 23

Name of Cnidaria

Question 24

are used for anchorage, defense and for the capture of prey

Answer 24

Cnidoblasts

Question 25

exhibit tissue level of organisation and are diploblastic.

Answer 25

Cnidarians

Question 26

Cnidarians have a central gastro-vascular cavity with a single opening, mouth on this. Digestion is intra and extracellular

Answer 26

Hypostome

Question 27

have a skeleton composed of calcium carbonate

Answer 27

Corals

Question 28

Cnidarians exhibit two basic body forms called

Answer 28

Polyp and medusa

Question 29

is a sessile and cylindrical form like Hydra, Adamsia, etc

Answer 29

Polyp

Question 30

is umbrella-shaped and free-swimming like Aurelia or jelly fish.

Answer 30

Medusa

Question 31

commonly known as sea walnuts or comb jellies are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organisation.

Answer 31

Ctenophores

Question 32

The body bears eight external rows of this, which help in locomotion

Answer 32

Ciliated comb plates

Question 33

is well-marked in ctenophores

Answer 33

Bioluminescence

Question 34

They have dorso-ventrally flattened body, hence are called flatworms. These are mostly endoparasites found in animals including human beings

Answer 34

Platyhelminthes

Question 35

are bilaterally symmetrical, triploblastic and acoelomate animals with organ level of organisation

Answer 35

Flatworms

Question 36

help in osmoregulation and excretion

Answer 36

Flame cells

Question 37

The body of this is circular in cross-section, hence, the name roundworms. They may be freeliving, aquatic and terrestrial or parasitic in plants and animals.

Answer 37

Aschelminthes

Question 38

have organ-system level of body organisation. They are bilaterally symmetrical, triploblastic and pseudocoelomate animals

Answer 38

Roundworms

Question 39

Sexes are separate, i.e., males and females are distinct.

Answer 39

DIoecious

Question 40

Alimentary canal is complete with a well-developed

Answer 40

Muscular pharynx

Question 41

They may be aquatic (marine and fresh water) or terrestrial; free-living, and sometimes parasitic.

Answer 41

Phylum Annelida

Question 42

Their body surface is distinctly marked out into this and, hence, the phylum name Annelida (Latin, annulus : little ring)

Answer 42

Segments/Metamers

Question 43

Aquatic annelids like Nereis possess lateral appendages, which help in swimming

Answer 43

Parapodia

Question 44

help in osmoregulation and excretion

Answer 44

Nephridia

Question 45

An aquatic form, is dioecious

Answer 45

Nereis

Question 46

Earthworms and leeches are

Answer 46

Monoecious