NEET Botany Biological Classification Questions Solved

NEET - 2017

Which of the following are found in extreme saline conditions?

(1) Archaebacteria

(2) Eubacteria

(3) Cyanobacteria

(4) Mycobacteria

Audio Explanation:


(1) Archaebacteria are the most primitive form of bacteria. These live in diverse habitat, e.g. extreme hot temperature, saline condition, variable pH, etc. Saline bacteria are called Halophiles (e.g., Halobacterium, Halococcus).

Concept Enhancer The ability of archaebactena to survive in harsh conditions is due to the presence of branched lipid chain in their membrane, which reduces the fluidity of their membrane.

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NEET - 2017

Viroids differ from viruses in having

(1) DNA molecules with protein coat

(2) DNA molecules without protein coat

(3) RNA molecules with protein coat

(4) RNA molecules without protein coat

Audio Explanation:


(4) Viroids differ from viruses in having RNA molecules without protein coat. Viruses on the other hand posses DNA or RNA with a protein coat as their genetic material. Viruses can infect a wide range of organisms including plants, animals or bacteria, while viroids infect only plants.

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NEET - 2016

Which one of the following is wrong for fungi?

(1) They are eukaryotic

(2) All fungi possess a purely cellulosic cell wall

(3) They are heterotrophic

(4) They are both unicellular and multicellular

Audio Explanation:


(2) In fungi, cell wall contains chitin or cellulose along with other polysaccharides, proteins and lipids. Only in some fungi, e.g. Phytophthora or other oomycetes a purely cellulosic cell wall is present. Hence, only option (b) is wrong, rest of the options are correct.

Concept Enhancer Chitin is chemically N-acetyl glucosamine. The exoskeleton of insects also contains this chemical.

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NEET - 2016

Methanogens belong to

(1) eubacteria

(2) archaebacteria

(3) dinoflagellates

(4) slime moulds

Audio Explanation:


(2) Methanogens belong to archaebacteria. It contains three major classes of primitive bacteria, i.e., Methanogens, halophilic and thermoacidophilic. Methanogens are strict anaerobes, present in the gut of several ruminant animals (e.g., cows, etc) and are responsible for production of methane gas from the dung of these animals.

Concept Enhancer Halophilic bacteria usually occur in salt rich substrate like salt marshes, etc., and are aerobic chemoheterotrophs. Thermophilic bacteria have the dual ability to tolerate high temperature as well as high acidity. These are basically chemosynthetic.

 

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NEET - 2016

 

Select the wrong statement.

(a) The walls of diatoms are easily destructible

(b) 'Diatomaceous earth' is formed by the cell walls of diatoms

(c) Diatoms are chief producers in the oceans

(d) Diatoms are microscopic and float passiveley in water

Audio Explanation:


 

(a) Diatoms are single celled plant like protists that produce intricately structured cell walls made of nano(-) silica SiO2. Thus, the walls are indestructible. Hence, only option (a) is wrong and rest of the options are correct.

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NEET - 2016

Match Column I with column II and select the correct option using the codes given below:

 

Column I

 

Column II

A.

Pistils fused together

1.

Gametogenesis

B.

Formation of gametes

2.

Pistillate

C. 

Hyphae of higher ascomycetes  

3.  

Syncarpous

D.

Unisexual female flower

4.

Dikaryotic

Codes:

 

A    

B     

C     

D

(1)

4

3

2

1

(2)

2

1

4

3

(3)

1

2

4

3

(4)  

3

1

4

2

Audio Explanation:


(4) (a) Pistils fused together - Syncarpous

(b) Formation of gametes - Gametogenesis

(c) Hyphae of higher ascomycetes - Dikaryotic

(d) Unisexual female flower - Pistillate

Concept Enhancer: Always remember in biology the latin word "Syn" signifies togetherness of fusion.

Time Saver: If you connect the information of concept enhancer with the codes given than see only option (4) contains 3. (syncarpous) for 'A' (pistils fused together), hence this is the only correct option.

The certainity of this answer is such that a further check on other options will be wastage of time.

 

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NEET - 2016

Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom

(1) Protista

(2) Fungi

(3) Animalia

(4) Monera

Audio Explanation:


(1) All single celled eukaryotic organisms-like chrysophytes [diatoms and desmids], euglenoids [Euglena], dinoflagellates and slime moulds are included in kingdom-Protista.

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NEET - 2016

The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the

(1) thermoacidophiles

(2) methanogens

(3) eubacteria

(4) halophiles

Audio Explanation:


(2) Methanogens are group of obligate anaerobic ancient and primitive bacteria. They are involved in methanogenesis and produce methane gas in ruminant of cattles.

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NEET - 2016

Which one of the following statements is wrong?

(1) Golden algae are also called desmids

(2) Eubacteria are also called false bacteria

(3) Phycomycetes are also called algal fungi

(4) Cyanobacteria are also called blue-green algae

Audio Explanation:


(2) Eubacteria are true bacteria which exhibit all true characteristic features of group Eubactera.

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NEET - 2016

One of the major components of cell wall of most fungi is

(1) peptidoglycan

(2) cellulose

(3) hemicellulose

(4) chitin

Audio Explanation:


(4) Cell wall of most fungi is made up of chitin. Chemically it is N-acetyl glucosamine. It is also found in the exoskeleton of insects.

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