Vidaara.orgClass 11 · Mathematics
CodeVID-M11-WS
Animal Kingdom — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
Sponges show which level of body organisation?
- A.Organ-system
- B.Organ
- C.Tissue
- D.Cellular
2.
An animal divisible into equal halves by any plane through the central axis has ___ symmetry.
- A.Bilateral
- B.Radial
- C.No
- D.Asymmetrical
3.
Animals with three germ layers are called:
- A.Diploblastic
- B.Triploblastic
- C.Acoelomate
- D.Asymmetrical
4.
A true body cavity lined by mesoderm is a:
- A.Notochord
- B.Coelom
- C.Segment
- D.Gill slit
5.
Stinging cells (cnidoblasts) are found in phylum:
- A.Porifera
- B.Cnidaria
- C.Annelida
- D.Mollusca
6.
Flatworms (Platyhelminthes) are:
- A.Coelomate
- B.Pseudocoelomate
- C.Acoelomate
- D.Radially symmetrical
7.
Ascaris (roundworm) belongs to which phylum?
- A.Platyhelminthes
- B.Aschelminthes
- C.Annelida
- D.Arthropoda
8.
The first segmented, truly coelomate animals belong to:
- A.Annelida
- B.Porifera
- C.Cnidaria
- D.Echinodermata
9.
The largest phylum, with jointed appendages and a chitin exoskeleton, is:
- A.Mollusca
- B.Arthropoda
- C.Chordata
- D.Annelida
10.
Starfish and sea urchins, with spiny skin and a water-vascular system, are:
- A.Molluscs
- B.Echinoderms
- C.Annelids
- D.Sponges
11.
Which is one of the three defining features of chordates?
- A.Chitin exoskeleton
- B.Notochord
- C.Stinging cells
- D.Eight legs
12.
In vertebrates, the notochord is replaced by a:
- A.Backbone (vertebral column)
- B.Shell
- C.Exoskeleton
- D.Gill slit
13.
Animals that breathe through gills, have fins and scales, and are cold-blooded belong to class:
- A.Amphibia
- B.Pisces
- C.Reptilia
- D.Aves
14.
Birds (Aves) are characterised by feathers and:
- A.Mammary glands
- B.Wings (modified forelimbs)
- C.Moist skin
- D.Gills throughout life
15.
Which two classes of vertebrates are warm-blooded?
- A.Pisces and Amphibia
- B.Aves and Mammalia
- C.Reptilia and Aves
- D.Amphibia and Reptilia
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
Adult starfish show radial symmetry, but their larvae are bilaterally symmetrical. This suggests echinoderms evolved from:
- A.Bilaterally symmetrical ancestors
- B.Asymmetrical sponges
- C.Plants
- D.Radially symmetrical adults only
17.
A true coelom is an advantage because it:
- A.Allows organs to develop, move and be cushioned independently of the body wall
- B.Removes the need for a gut
- C.Stops the animal moving
- D.Replaces the nervous system
18.
A worm is bilaterally symmetrical, triploblastic and has a fluid 'false' cavity not fully lined by mesoderm. It is a:
- A.Pseudocoelomate (Aschelminthes)
- B.Acoelomate flatworm
- C.True coelomate annelid
- D.Sponge
19.
Why are amphibians tied to water for reproduction even though they live on land?
- A.They lay eggs without shells that must stay moist, and gametes need water
- B.They cannot breathe air
- C.They have gills only
- D.They are warm-blooded
20.
Reptiles colonised dry land more successfully than amphibians largely because they have:
- A.Dry scaly skin and shelled eggs that resist water loss
- B.Moist skin
- C.Gills throughout life
- D.Feathers
21.
A bat flies and a whale swims, yet both are classed as mammals because they:
- A.Have hair and feed their young on milk from mammary glands
- B.Lay shelled eggs
- C.Breathe with gills
- D.Are cold-blooded
Answer Key
Section A — Multiple Choice (1 mark each)
- (D) Cellular
- (B) Radial
- (B) Triploblastic
- (B) Coelom
- (B) Cnidaria
- (C) Acoelomate
- (B) Aschelminthes
- (A) Annelida
- (B) Arthropoda
- (B) Echinoderms
- (B) Notochord
- (A) Backbone (vertebral column)
- (B) Pisces
- (B) Wings (modified forelimbs)
- (B) Aves and Mammalia
Section B — Challenge / Olympiad (2 marks each)
- (A) Bilaterally symmetrical ancestors
- (A) Allows organs to develop, move and be cushioned independently of the body wall
- (A) Pseudocoelomate (Aschelminthes)
- (A) They lay eggs without shells that must stay moist, and gametes need water
- (A) Dry scaly skin and shelled eggs that resist water loss
- (A) Have hair and feed their young on milk from mammary glands
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