biology MCQs - 11th class Chapter 07 Mcqs

1

Who first proposed the kingdom Protoctista in 1861 for microscopic organisms?

A

Ernst Haeckel

B

Robert Whittaker

C

John Hogg

D

Herbert Copeland

2

According to the text, Kingdom Protista is defined by which method?

A

Inclusion

B

Exclusion

C

Nutrition type

D

Locomotion type

3

Which feature is described as the unifying feature of protists?

A

Unicellularity

B

Aquatic habitat

C

Eukaryotic cell organization

D

Photosynthesis

4

Protists are considered a polyphyletic group, meaning they probably do not share what?

A

A habitat

B

A mode of nutrition

C

A single common ancestor

D

Eukaryotic cells

5

Which group of protozoa moves by forming cytoplasmic projections called pseudopodia?

A

Ciliates

B

Zooflagellates

C

Apicomplexans

D

Amoebae

6

Entamoeba histolytica is an intestinal parasite that causes what disease in humans?

A

Malaria

B

Amoebic dysentery

C

Sleeping sickness

D

Late blight

7

The giant amoeba Pelomyxa palustris is considered primitive because it lacks most organelles but has what?

A

A single nucleus

B

A cell wall

C

Multiple membrane-bound nuclei

D

Chloroplasts

8

Zooflagellates, like Trichonymphas, live as symbionts in the guts of which insects?

A

Mosquitoes

B

Termites

C

Tsetse flies

D

Ants

9

African sleeping sickness is caused by Trypanosoma and transmitted by the bite of which infected insect?

A

Anopheles mosquito

B

Tsetse fly

C

Sandfly

D

Flea

10

The flexible outer covering of Ciliates like Paramecium is called a?

A

Cell wall

B

Test

C

Shell

D

Pellicle

11

Ciliates are distinct from other protozoans for having how many kinds of nuclei?

A

One

B

Two

C

Three

D

Four

12

The sexual process in most ciliates where two individuals exchange genetic material is called?

A

Budding

B

Binary fission

C

Conjugation

D

Sporulation

13

The shells or tests of foraminiferans are made of what substance?

A

Silica

B

Chitin

C

Cellulose

D

Calcium

14

Dead foraminiferans contribute to the formation of what geological deposit?

A

Granite

B

Chalk

C

Coal

D

Sandstone

15

Apicomplexans, such as Plasmodium, lack specific structures for locomotion and move by what means?

A

Flexing

B

Flagella

C

Cilia

D

Pseudopods

16

The malarial parasite Plasmodium first enters which cells in the human body after a mosquito bite?

A

Red blood cells

B

Muscle cells

C

Liver cells

D

Nerve cells

17

Algae are responsible for what approximate percentage of all photosynthesis on Earth?

A

10-20%

B

25-35%

C

50-60%

D

80-90%

18

A plant-like body that is not differentiated into true roots, stems, and leaves is called a?

A

Hypha

B

Thallus

C

Mycelium

D

Stipe

19

The classification of algal phyla is largely based on their what?

A

Size

B

Habitat

C

Reproductive method

D

Pigment composition

20

Which algal phylum is the only one where all members lack flagellated motile cells in their life cycle?

A

Phaeophyta

B

Chlorophyta

C

Rhodophyta

D

Euglenophyta

21

Euglenoids are thought to be closely related to which other group of protists based on molecular data?

A

Ciliates

B

Amoebae

C

Zooflagellates

D

Diatoms

22

Population explosions of which protists cause the phenomenon known as 'red tides'?

A

Diatoms

B

Dinoflagellates

C

Green algae

D

Red algae

23

The cell wall of a diatom consists of two overlapping shells made of what glasslike material?

A

Silica

B

Cellulose

C

Calcium carbonate

D

Chitin

24

Which group of algae are called the 'giants' of the protist kingdom, with some reaching 75 meters?

A

Green algae

B

Red algae

C

Diatoms

D

Brown algae

25

The parts of a kelp (brown alga) include a rootlike anchoring structure called the?

A

Stipe

B

Blade

C

Holdfast

D

Frond

26

Some red algae are important in building coral reefs because they incorporate what into their cell walls?

A

Silica

B

Magnesium

C

Calcium carbonate

D

Potassium

27

Which algae are generally accepted as the ancestors of plants?

A

Brown algae

B

Red algae

C

Green algae

D

Diatoms

28

What is the main energy reserve stored by green algae, similar to plants?

A

Glycogen

B

Oil

C

Starch

D

Laminarin

29

Chlorella is a unicellular non-motile green alga investigated as an alternative source of what?

A

Biofuel

B

Medicine

C

Fiber

D

Food

30

Which substance, derived from marine algae, is used as a gelling agent in labs and food?

A

Algin

B

Agar

C

Carrageenan

D

Antiseptics

31

Fungus-like protists are different from fungi because they have centrioles and their cell walls contain what?

A

Chitin

B

Peptidoglycan

C

Cellulose

D

Lignin

32

The feeding stage of a slime mold is a multinucleate mass of cytoplasm called a?

A

Plasmodium

B

Hypha

C

Mycelium

D

Spore

33

During unfavorable conditions, slime molds form resistant haploid spores inside stalked structures called?

A

Zygotes

B

Sporangia

C

Gametes

D

Conidia

34

Which organism is used as a model to study processes like cytoplasmic streaming and differentiation?

A

Amoeba proteus

B

Paramecium caudatum

C

Physarum polycephalum

D

Euglena gracilis

35

Water molds (Oomycotes) have hyphae that are described as what?

A

Septate

B

Aseptate

C

Dikaryotic

D

Haploid

36

Phytophthora infestans is an oomycote that causes what disease in potatoes?

A

Early blight

B

Ring rot

C

Potato scab

D

Late blight

37

The Irish potato famine in the 1840s was caused by which type of protist?

A

Slime mold

B

Water mold

C

Apicomplexan

D

Dinoflagellate

38

In the five-kingdom system by Robert Whittaker (1969), which organisms were placed in Kingdom Protista?

A

All prokaryotes

B

Only unicellular eukaryotes

C

Only multicellular algae

D

All fungi

39

Actinopods are marine protozoans that produce shells made of what?

A

Calcium

B

Cellulose

C

Silica

D

Chitin

40

Which term describes organisms like Euglena that can be photosynthetic in light but heterotrophic in dark?

A

Autotrophic

B

Heterotrophic

C

Mixotrophic

D

Saprotrophic

41

What are the short, hair-like structures used by Paramecium for locomotion?

A

Flagella

B

Pseudopods

C

Cilia

D

Tentacles

42

The large, polyploid nucleus in ciliates that controls cell metabolism and growth is the?

A

Micronucleus

B

Macronucleus

C

Protonucleus

D

Endonucleus

43

The body of a seaweed (multicellular alga) lacks xylem and phloem. This type of body is known as a?

A

Thallus

B

Corm

C

Rhizome

D

Tuber

44

Besides chlorophyll a, what photosynthetic pigments are found in all algae?

A

Phycobilins

B

Fucoxanthin

C

Phycoerythrin

D

Yellow and orange carotenoids

45

Which group of protozoa is entirely parasitic?

A

Ciliates

B

Amoebae

C

Apicomplexans

D

Zooflagellates

46

Choanoflagellates are of special interest due to their striking resemblance to collar cells in which animals?

A

Corals

B

Jellyfish

C

Sponges

D

Worms

47

The cell walls of dinoflagellates are often made of interlocking plates of what substance?

A

Silica

B

Cellulose

C

Chitin

D

Pectin

48

What is the function of contractile vacuoles in freshwater ciliates?

A

Digestion

B

Reproduction

C

Water regulation

D

Food intake

49

Which of these is an example of a colonial green alga mentioned in the text?

A

Chlamydomonas

B

Spirogyra

C

Ulva

D

Volvox