Biological Classification Test

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Biological Classification Test - 80

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Weekly Quiz Competition

Question 1
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Match column I with column II and select the correct option from the codes given below.
Column I Column II
A. Choanocytes i. Platyhelminthes
B. Cnidoblasts ii. Ctenophora
C. Flame cells iii. Porifera
D. Nephridia iv. Coelenterata
E. Comb plates v. Annelida

A
A - (ii), B - (i), C - (iv), D - (v), E - (iii)

B
A - (ii), B - (iv), C - (i), D - (v), E - (iii)

C
A - (iii), B - (iv), C - (i), D - (v), E - (ii)

D
A - (iii), B - (i), C - (iv), D - (v), E - (ii)

Solution

Ctenophores are characterized by eight rows of cilia, which are used for locomotion. The cilia in each row are arranged to form a stack of combs, also called comb plates, or ctenes; thus the name ctenophore comes from the Greek, meaning "comb bearer.

A flame cell is a specialized excretory cell found in the simplest freshwater invertebrates, including flatworms (except the turbellarian order Acoela), rotifers and nemerteans; these are the simplest animals to have a dedicated excretory system. Flame cells function like a kidney, removing waste materials. Bundles of flame cells are called protonephridia.

The word nephridium applies in its strict sense only to the excretory organs of annelids, but it may usefully be extended to include the excretory organs of other phyla having similar characteristics. Annelids are segmented animals that typically contain a pair of nephridia on each segment.

Choanocytes are cells that line the interior of asconoid, syconoid and leuconoid body type sponges that contain a central flagellum, or undulipodia, surrounded by a collar of microvilli which are connected by a thin membrane. They make up Choanoderm, a type of cell layer found in sponges.

A cnidocyte (also known as a cnidoblast or nematocyte) is an explosive cell containing one giant secretory organelle or cnida (plural cnidae) that defines the phylum Cnidaria (corals, sea anemones, hydrae, jellyfish, etc.). Cnidae are used for prey capture and defense from predators.

So the correct option is 'A - (iii), B - (iv), C - (i), D - (v), E - (ii)'.
Question 2
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Find out the correct statement.

A
In lichens, the algal component is called phycobiont and fungal component is known as mycobiont, which are heterotrophic and autotrophic, respectively.

B
Viroid contains RNA of low molecular weight and protein coat.

C
A virus contains both RNA and DNA.

D
Viruses are obligatory parasites.

Solution

All viruses are obligatory parasites; that is, they need metabolic hardware of host to produce vitality or to orchestrate proteins. So they rely upon host cells to complete these essential capacities.
Thus, the correct answer is 'Viruses are obligatory parasites'.
Question 3
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Select the correct combination of the statements (i - iv) regarding the characteristics of certain organisms.
(i) Methanogens are archaebacterial which produces methane in marshy areas.
(ii) Nostoc is a filamentous blue-green alga which fixed atmospheric nitrogen.
(iii) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
(iv) Mycoplasma lacks a cell wall and can survive without oxygen.

A
(ii) and (iii)

B
(i), (ii) and (iii)

C
(ii), (iii) and (iv)

D
(i), (ii) and (iv)

Solution

Methanogens produce methane gas, nostoc fixes atmospheric nitrogen, mycoplasma lacks a cell wall and can survive without oxygen.
So, the correct option is '(i), (ii) and (iv)'.
Question 4
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With respect to the fungal sexual cycle, choose the correct sequence of events-

A
Karyogamy, plasmogamy and meiosis

B
Meiosis, plasmogamy and karyogamy

C
Plasmogamy, karyogamy and meiosis

D
Meiosis, karyogamy and plasmogamy

Solution

$$\textbf{Correct option: (C)}$$

$$\textbf{Explanation for correct option: }$$

In fungi, sexual cycle involves the following three steps:

$$\bullet$$ Fusion of protoplasm between two motile or nonmotile gametes which is known as plasmogamy.

$$\bullet$$ Fusion of two nuclei called karyogamy.

$$\bullet$$ Meiosis in zygote resulting in haploid spores.

$$\bullet$$ Hence the correct sequence is-

Plasmogamy $$\to$$ Karyogamy $$\to$$ Meiosis
Question 5
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Association between mycobiont and phycobiont is found in-

A
Mycorrhiza

B
Root

C
Lichens

D
BGA

Solution

$$\textbf{Correct option:(C)}$$

$$\textbf{Explanation for correct option:}$$

$$\bullet$$ Lichens represents mutualistic relationship between fungus and photosynthesising algae or cyanobacteria.

$$\bullet$$The fungal partner is known as mycobiont and algal partner is known as phycobiont.

$$\bullet$$The role of mycobiont is to provide shelter and absorb mineral nutrients and water for its partner.

$$\bullet$$The role of phycobiont is mainly in providing food through photosynthesis to the fungal component.

$$\bullet$$ Hence the correct option is (C)
Question 6
1 / -0

Which of the following bacteria is present in the rumen of cattle ?

A
Azotobacfer

B
Rhizoblum

C
Methanobacterium

D
Azospirilium

Solution

Methanobacterium is found in the rumen (a part of the stomach) of cattle. A lot of cellulosic material is also available in the rumen. In rumen, these bacteria help in the breakdown of cellulose and play an important role in nutrition of cattle.
Question 7
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In lithosere, foliose lichens make the conditions favourable for the growth of

A
Crustose lichens

B
Mosses

C
Annual grasses

D
Perennial grasses
Solution
Correct option: B

Explanation:
In lithosere (xerarch), the pioneer community is usually constituted by crustose lichens (e.g., Graphis, Rhizocarpon).
Foliose lichens(e.g., Dermatocarpon, Parmelia) kill the crustose lichens by shading them, cause deeper depressions and accumulate more soil particles and organic matter.
These Foliose lichens make the conditions favourable for the growth of hardy mosses (e.g., Tortula, Grimmia).
Thus, the correct answer is 'Mosses'.
Question 8
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Mitosis is in many fungi differs in a remarkable way from that observed in plant or animal cells. What is that?

A
Cell develops affinity for a yellow dye, picric acid

B
Cell swells to four times just before division

C
Nuclear envelope may not disappear

D
Cell becomes hydrophobic

Solution

The nucleus during mitosis. Micrographs illustrating the progressive stages of mitosis in a plant cell. During prophase, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down. At metaphase, the condensedchromosomes . So, the correct option is "C" (Nuclear envelope may not disappear).
Question 9
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Which of the following is used as an atmospheric pollution indicator?

A
Lepidoptera

B
Lichens

C
Lycopersicon

D
Lycopodium

Solution

Lichens are used as an atmospheric pollution indicator. Lichens are plants that grow in exposed places such as rocks or tree bark. Rainwater having air pollutants especially sulfur dioxide, can damage lichens and prevent them from growing. This makes lichens natural indicators of air pollution.
So the correct option is 'Lichens'
Question 10
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Study the following statements and select the correct ones.
(i) Methanogens are archaebacteria which produce methane in marshy areas.
(ii) Nostoc is a filamentous blue green alga which fixes atmospheric nitrogen.
(iii) Many members of the genus Glomus form mycorrhiza.

A
(i) and (ii)

B
(i) and (iii)

C
(ii) and (iii)

D
(i), (ii) and (iii)

Solution

Methanogens are archaebacteria which produce methane in marshy areas. Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen. Many members of the genus Glomus form endomycorrhiza.
So, the correct option is '(i), (ii) and (iii)'

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Column I	Column II
A. Choanocytes	i. Platyhelminthes
B. Cnidoblasts	ii. Ctenophora
C. Flame cells	iii. Porifera
D. Nephridia	iv. Coelenterata
E. Comb plates	v. Annelida

Biological Classification Test - 80

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Biological Classification Test - 80

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SHARING IS CARING

Question 1

A - (ii), B - (i), C - (iv), D - (v), E - (iii)

A - (ii), B - (iv), C - (i), D - (v), E - (iii)

A - (iii), B - (iv), C - (i), D - (v), E - (ii)

A - (iii), B - (i), C - (iv), D - (v), E - (ii)

Solution

Question 2

In lichens, the algal component is called phycobiont and fungal component is known as mycobiont, which are heterotrophic and autotrophic, respectively.

Viroid contains RNA of low molecular weight and protein coat.

A virus contains both RNA and DNA.

Viruses are obligatory parasites.

Solution

Question 3

(ii) and (iii)

(i), (ii) and (iii)

(ii), (iii) and (iv)

(i), (ii) and (iv)

Solution

Question 4

Karyogamy, plasmogamy and meiosis

Meiosis, plasmogamy and karyogamy

Plasmogamy, karyogamy and meiosis

Meiosis, karyogamy and plasmogamy

Solution

Question 5

Mycorrhiza

Root

Lichens

BGA

Solution

Question 6

Azotobacfer

Rhizoblum

Methanobacterium

Azospirilium

Solution

Question 7

Crustose lichens

Mosses

Annual grasses

Perennial grasses

Solution

Question 8

Cell develops affinity for a yellow dye, picric acid

Cell swells to four times just before division

Nuclear envelope may not disappear

Cell becomes hydrophobic

Solution

Question 9

Lepidoptera

Lichens

Lycopersicon

Lycopodium

Solution

Question 10

(i) and (ii)

(i) and (iii)

(ii) and (iii)

(i), (ii) and (iii)

Solution

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