biology MCQs - 11th class Chapter 10 Mcqs

1

Which group of animals is characterized by a lack of tissues organized into organs and an asymmetrical body shape?

A

Eumetazoa

B

Radiata

C

Bilateria

D

Parazoa

2

Animals that develop from two dissimilar haploid gametes are described as what?

A

Ingestive heterotrophs

B

Multicellular diploid eukaryotes

C

Having a large egg and a smaller sperm

D

All of the above

3

In Grade Radiata, animals are organized such that any plane passing through the central axis divides the animal into mirror-image halves. This is known as:

A

Bilateral symmetry

B

Asymmetry

C

Radial symmetry

D

Spherical symmetry

4

Triploblastic animals that do not have a body cavity are grouped under which category?

A

Coelomata

B

Pseudocoelomata

C

Acoelomata

D

Bilateria

5

In the developmental series Deuterostomia, the blastopore forms the:

A

Mouth

B

Anus

C

Coelom

D

Gut

6

The coelom in protostomes is formed by the splitting of the mesoderm, a process known as:

A

Enterocoelous

B

Schizocoelous

C

Blastocoelous

D

Archenteron

7

Diploblastic animals, like those in phylum Cnidaria, have a body made of ectoderm and endoderm with what kind of layer in between?

A

Mesenchyme

B

Parenchyma

C

Mesoderm

D

Mesogloea

8

Which phylum is characterized by animals that are acoelomate and have a sac-type gut?

A

Nematoda

B

Annelida

C

Platyhelminthes

D

Mollusca

9

The space between the body wall and the digestive tube in Aschelminthes is called a:

A

True coelom

B

Haemocoel

C

Gastrovascular cavity

D

Pseudocoelom

10

What is the name for the pore-bearing animals commonly called sponges?

A

Cnidaria

B

Annelida

C

Porifera

D

Mollusca

11

The outer layer of a sponge's body wall is the pinacoderm, which is made up of cells called:

A

Choanocytes

B

Amoeboid cells

C

Pinacocytes

D

Spicules

12

In sponges, the single large exit opening for water is called the:

A

Ostia

B

Spongocoel

C

Choanoderm

D

Osculum

13

The asexual reproduction in sponges through the formation of internal buds is known as creating:

A

Gemmules

B

Larvae

C

Zygotes

D

Blastula

14

Which of the following is an example of a freshwater sponge?

A

Sycon

B

Euplectella

C

Leucoselenia

D

Spongilla

15

The special stinging cells that give Phylum Cnidaria its name are called:

A

Nematocysts

B

Cnidocytes

C

Gastrozoids

D

Tentacles

16

In Cnidarians, the free-swimming, umbrella-like form involved in sexual reproduction is the:

A

Polyp

B

Gastrozoid

C

Medusa

D

Blastostyle

17

The occurrence of more than two different types of individuals (zooids) within the same organism, like in Obelia, is called:

A

Alternation of generations

B

Polymorphism

C

Hermaphroditism

D

Metamerism

18

Which Cnidarian exists only in polyp form and lacks alternation of generations?

A

Obelia

B

Aurelia

C

Hydra

D

Actinia

19

The hard exoskeleton of corals is formed of what substance?

A

Chitin

B

Silica

C

Spongin

D

Calcium carbonate

20

The excretory system in Platyhelminthes consists of branching tubes ending in bulb-like cells called:

A

Nephridia

B

Malpighian tubules

C

Flame cells

D

Excretory pores

21

Fasciola, the liver fluke, completes its life cycle in two hosts, one of which is a:

A

Pig

B

Cow

C

Fish

D

Snail

22

Which characteristic is NOT an adaptation for a parasitic mode of life in Platyhelminthes?

A

Presence of a ciliated outer surface

B

Development of suckers and hooks

C

Simplified digestive system

D

Production of ova in huge numbers

23

The body cavity in nematodes is derived from the hollow space of the blastula and is called a:

A

Coelom

B

Enterocoel

C

Pseudocoelom

D

Haemocoel

24

Ancylostoma duodenale, the hookworm, is dangerous because it sucks blood and produces a(n) __________ to prevent clotting.

A

Anticoagulant

B

Anesthetic

C

Toxin

D

Enzyme

25

The body of an annelid is divided into a number of similar parts or segments. This condition is known as:

A

Tagmatization

B

Cephalization

C

Metameric segmentation

D

Strobilation

26

In annelids, excretion takes place by specialized ciliated organs present in each segment, called:

A

Flame cells

B

Nephridia

C

Malpighian tubules

D

Kidneys

27

Which class of annelids has a distinct head region with eyes, palps, and tentacles?

A

Oligochaeta

B

Hirudinea

C

Polychaeta

D

Annelida

28

The waterproof chitinous cuticle that covers the body of arthropods is secreted by the:

A

Endodermis

B

Mesoderm

C

Epidermis

D

Haemocoel

29

In arthropods, the excretory system is comprised of:

A

Nephridia

B

Flame cells

C

Green glands

D

Malpighian tubules

30

Which class of Arthropoda has a body divided into a cephalothorax and abdomen, and possesses chelicerae?

A

Insecta

B

Crustacea

C

Myriapoda

D

Arachnida

31

The shedding of the exoskeleton in arthropods to allow for growth is called:

A

Metamorphosis

B

Moulting or ecdysis

C

Regeneration

D

Budding

32

The mosquito genus Anopheles is a harmful insect because it transmits:

A

Trypanosoma

B

Plasmodium

C

Cholera

D

Hepatitis

33

In many molluscs, the mouth cavity contains a rasping, tongue-like organ with horny teeth called the:

A

Radula

B

Mantle

C

Nephridium

D

Foot

34

The respiratory pigment found in the blood of molluscs, which is blue in color, is called:

A

Haemoglobin

B

Myoglobin

C

Haemocyanin

D

Chlorocruorin

35

Which class of Mollusca includes organisms that are asymmetrical and typically have a single, coiled shell?

A

Bivalvia

B

Cephalopoda

C

Gastropoda

D

Pelecypoda

36

A unique characteristic of echinoderms is the presence of a:

A

Closed circulatory system

B

Water vascular system

C

Nervous system with a brain

D

Chitinous exoskeleton

37

Adult echinoderms exhibit radial symmetry, but their larval forms exhibit:

A

Asymmetry

B

Spherical symmetry

C

Bilateral symmetry

D

No symmetry

38

The ability to reform lost organs, common in starfish and sea cucumbers, is called:

A

Regeneration

B

Metamorphosis

C

Budding

D

Affinities

39

Phylum Hemichordata is considered a link between invertebrates and which other phylum?

A

Annelida

B

Arthropoda

C

Mollusca

D

Chordata

40

The structure in chordates that is a rod-like, semi-rigid body of vacuolated cells is the:

A

Nerve cord

B

Vertebral column

C

Notochord

D

Endoskeleton

41

Which sub-phylum of chordates has a notochord and nerve cord that persist throughout life and extend the entire length of the body?

A

Urochordata

B

Vertebrata

C

Cephalochordata

D

Craniata

42

The class Cyclostomata, which includes lampreys, is distinguished by being:

A

Jawed vertebrates

B

Without jaws

C

Having a bony skeleton

D

Possessing paired appendages

43

Sharks and rays belong to which class?

A

Osteichthyes

B

Cyclostomata

C

Chondrichthyes

D

Aves

44

A key adaptation in bony fishes that acts as a hydrostatic organ to control buoyancy is the:

A

Operculum

B

Swim bladder

C

Lateral line

D

Paired fins

45

The fossil of Archaeopteryx is considered a connecting link between which two groups?

A

Reptiles and Mammals

B

Fish and Amphibians

C

Reptiles and Birds

D

Amphibians and Reptiles

46

The muscular diaphragm that separates the thoracic and abdominal cavities is a characteristic feature of:

A

Birds

B

Reptiles

C

Amphibians

D

Mammals

47

Mammals that lay eggs, such as the Duck-billed Platypus, belong to which sub-class?

A

Eutheria

B

Metatheria

C

Prototheria

D

Marsupialia

48

Pouched mammals like kangaroos, which rear their immature young in a marsupium, belong to the sub-class:

A

Prototheria

B

Eutheria

C

Monotremata

D

Metatheria

49

Placental mammals, where the fetus is nourished through a placenta, are grouped under which sub-class?

A

Eutheria

B

Metatheria

C

Prototheria

D

Anamniotes