Biology Test 359

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Biology Test 359

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following is an example of a green algae?

A
Laminaria

B
Sargassum

C
Chlamydomonas

D
Fucus

Solution

The correct answer is Chlamydomonas.

Chlamydomonas is found in stagnant water and on damp soil as well as freshwater, seawater, and even in snow.

About Chlamydomonas-

Class: Chlorophyceae

Order: Chlamydomonadales

Scientific name: Chlamydomonas

Phylum: Chlorophyta

Higher classification: Chlamydomonadaceae
Question 2
4 / -1

Which of the following correctly describes the role of viroids?

A
They are protein-based infectious agents causing neurological diseases.

B
They are larger than viruses and consist of DNA.

C
They are composed of free RNA without a protein coat and cause diseases like potato spindle tuber disease.

D
They serve as a symbiotic relationship between algae and fungi.

Solution

Viroids are unique infectious agents made up solely of a short strand of RNA, without a protein coat, known for causing diseases in plants such as potato spindle tuber disease. This makes Option C correct. Option A incorrectly describes prions, not viroids; Option B is false as viroids are smaller than viruses and lack DNA; Option D describes lichens, not viroids.
Question 3
4 / -1

Which of the following is a characteristic feature of sponges?

A
Tissue level of organization

B
Presence of Ostia

C
Extracellular digestion

D
Indirect development

Solution

The characteristic feature of sponges (phylum Porifera) among the options provided is the presence of Ostia. Ostia are tiny pores or openings on the body of a sponge that allow water to enter its central cavity, called the spongocoel. These ostia are responsible for the filtration of water, which is a vital process for sponges to obtain food and oxygen.
Question 4
4 / -1

Read the following statements about bryophytes and select the incorrect ones:

(a) Mosses have an elaborate mechanism of spore dispersal.

(b) In liverworts, the haploid free living sporophyte is formed by spore germination.

(c) Vegetative reproduction in Polytrichum occurs by budding in the secondary protonema.

(d) Marchantia is a heterosporous bryophyte.

(e) Growth of bog moss ultimately fills ponds and lakes with soil.

A
(a), (b), and (c)

B
(d) and (e) only

C
(b) and (d) only

D
All except (a)

Solution

Analyzing each statement:

Statement (a) is correct; mosses indeed have complex mechanisms for spore dispersal, utilizing various environmental factors.

Statement (b) is incorrect; in liverworts, the sporophyte develops from the zygote and is dependent on the gametophyte, not directly from spores.

Statement (c) is correct; Polytrichum can reproduce vegetatively through budding in the secondary protonema.

Statement (d) is incorrect; Marchantia, like most liverworts, is homosporous and produces only one type of spore.

Statement (e) is correct; sphagnum moss, or bog moss, contributes to the gradual filling of ponds and lakes by trapping sediments.

The incorrect statements are (b) "In liverworts, the haploid free living sporophyte is formed by spore germination," and (d) "Marchantia is a heterosporous bryophyte," making Option C the correct choice.
Question 5
4 / -1

What characteristic of cockroach nymphs distinguishes their development process as paurometabolous?

A
Nymphs undergo a pupal stage before becoming adults.

B
Nymphs resemble miniature adults and undergo multiple molts.

C
Nymphs emerge from eggs fully formed as winged adults.

D
Nymphs develop in aquatic environments before transitioning to land.

Solution

Cockroaches undergo paurometabolous development, characterized by nymphs that resemble miniature adults. These nymphs progressively become adults through multiple molts, growing in size and maturity with each stage. This type of development is typical of insects that do not undergo a complete metamorphosis involving a pupal stage (Option A). Options C and D are not applicable to cockroaches as they neither hatch as winged adults nor start their life cycle in aquatic environments.
Question 6
4 / -1

Which algal group is primarily found in marine habitats and possesses chlorophyll a, c, and fucoxanthin?

A
Chlorophyceae

B
Rhodophyceae

C
Phaeophyceae

D
Myxophyceae

Solution

Phaeophyceae, or brown algae, are primarily marine and contain chlorophyll a, c, and the xanthophyll pigment fucoxanthin. This correctly identifies Option C as the answer.
Question 7
4 / -1

The order generally ends with

A
ales

B
aceae

C
eae

D
none of these

Solution

The order generally ends with ales. Order being a higher category is the assemblage of families which exhibit a few similar characters.
Question 8
4 / -1

Bacteria multiply by ___________.

A
Asexual reproduction

B
Sort of Sexual reproduction only

C
buds

D
Both a and b

Solution

Bacteria primarily reproduce through asexual reproduction, typically by binary fission. While bacteria can engage in processes like conjugation, which involves the transfer of DNA between bacteria, this is not considered true sexual reproduction because it does not involve the fusion of gametes. True sexual reproduction, as understood in eukaryotic organisms, does not occur in bacteria. And buds are produced in hydra.

Line in NCERT: Bacteria reproduce mainly by fission. Sometimes, under unfavourable conditions, they produce spores. They also reproduce by a sort of sexual reproduction by adopting a primitive type of DNA transfer from one bacterium to the other.
Question 9
4 / -1

What type of blood circulatory system do cockroaches have?

A
Closed circulatory system

B
Open circulatory system

C
Dual circulatory system

D
No circulatory system

Solution

Cockroaches, like many other insects, possess an open circulatory system. This system is characterized by a limited network of blood vessels and a heart that pumps the hemolymph (blood) into the body cavity, where it directly bathes the organs. There is no distinction between blood and interstitial fluid in this type of system, unlike in closed circulatory systems.
Question 10
4 / -1

Which of the following are correct?

(i) Diploblastic:Coelenterates

(ii) Triploblastic:Platyheliminthes to Chorodates

(iii) Acoelomate: Platyhelminthes

(iv) Pseudocoelomate:Aschelminthes /Roundworms

(v) Eucoelomate:Annelids to Chordates

A
(iv) and (v) are correct

B
(i), (ii), (iii) ,(iv) and (v) are correct

C
(i), (ii) and (v) are correct

D
(iii) and (v) are correct

Solution

(i) Diploblastic: Coelenterates (Cnidarians) are diploblastic as they have two germ layers: ectoderm and endoderm.

(ii) Triploblastic - Platyhelminthes to Chordates are triploblastic as they possess three germ layers: ectoderm, mesoderm, and endoderm.

(iii) Acoelomate - Platyhelminthes are classified as acoelomates.

(iv) Pseudocoelomate - Aschelminthes/Roundworms have a pseudocoelom.

(v) Eucoelomate - Annelids to Chordates have a true coelom.

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Biology Test 359

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Biology Test 359

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Question 1

Laminaria

Sargassum

Chlamydomonas

Fucus

Solution

Question 2

They are protein-based infectious agents causing neurological diseases.

They are larger than viruses and consist of DNA.

They are composed of free RNA without a protein coat and cause diseases like potato spindle tuber disease.

They serve as a symbiotic relationship between algae and fungi.

Solution

Question 3

Tissue level of organization

Presence of Ostia

Extracellular digestion

Indirect development

Solution

Question 4

(a), (b), and (c)

(d) and (e) only

(b) and (d) only

All except (a)

Solution

Question 5

Nymphs undergo a pupal stage before becoming adults.

Nymphs resemble miniature adults and undergo multiple molts.

Nymphs emerge from eggs fully formed as winged adults.

Nymphs develop in aquatic environments before transitioning to land.

Solution

Question 6

Chlorophyceae

Rhodophyceae

Phaeophyceae

Myxophyceae

Solution

Question 7

ales

aceae

eae

none of these

Solution

Question 8

Asexual reproduction

Sort of Sexual reproduction only

buds

Both a and b

Solution

Question 9

Closed circulatory system

Open circulatory system

Dual circulatory system

No circulatory system

Solution

Question 10

(iv) and (v) are correct

(i), (ii), (iii) ,(iv) and (v) are correct

(i), (ii) and (v) are correct

(iii) and (v) are correct

Solution

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