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NEET • BIOLOGY • LIVING WORLD
Living world practice · Medium
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61
Medium
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Understanding
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The defining feature of life forms i.e. unique to human beings only is
View answer and explanation
Correct option: D
Self consciousness
Option D (Self consciousness) is correct because self-consciousness, the awareness of oneself as an individual, is a defining feature unique to human beings.
Solution approach
- Correct Answer + Core Reason: Self consciousness. This is a unique defining feature of human beings.
Step-by-Step Solution:
Step 1: Consider the definitions of each option:
A. Metabolism: Chemical processes occurring in all living organisms.
B. Intrinsic growth: Growth from within, seen in living organisms.
C. Cellular organization: All living organisms are composed of cells.
D. Self consciousness: Awareness of oneself.
Step 2: Identify the feature unique to human beings: Self-consciousness.
Why other options are wrong:
- Option A: Metabolism: Metabolism occurs in all living organisms, not just humans.
- Option B: Intrinsic growth: Intrinsic growth is a characteristic of many living organisms, not unique to humans.
- Option C: Cellular organization: All living organisms exhibit cellular organization, not just humans.
Key Concepts:
- Defining features of life
- Consciousness
Memory Aids:
- Self-consciousness = Awareness of self
Quick Tips:
- Consider which feature is unique to humans.
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Remembering
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Taxonomic group of any rank is
View answer and explanation
Correct option: C
Taxon
Option C (Taxon) is correct because a taxon is a general term for any taxonomic group, regardless of its rank in the classification hierarchy.
Solution approach
- Correct Answer + Core Reason: C. Taxon. A taxon is a taxonomic group of any rank.
Step-by-Step Solution:
Step 1: Define taxon.\nA taxon is a group of organisms classified together in a taxonomic hierarchy.
Step 2: Define the other terms.\nClass: A taxonomic rank.\nOrder: A taxonomic rank.\nPhylum: A taxonomic rank.
Step 3: Relate the terms to the question.\nA taxon is a general term that includes class, order, phylum, etc.
Why other options are wrong:
- Option A: Class - Class is a specific taxonomic rank, not a general term for any rank.
- Option B: Order - Order is a specific taxonomic rank, not a general term for any rank.
- Option D: Phylum - Phylum is a specific taxonomic rank, not a general term for any rank.
Key Concepts:
- Taxonomy
- Taxonomic ranks
- Taxon
Memory Aids:
- Taxon = Taxonomic group.
Quick Tips:
- Understand the terminology of taxonomy.
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Remembering
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How many species have been identified and described till now?
View answer and explanation
Correct option: B
1.7-1.8 million
Option B (1.7-1.8 million) is correct because approximately 1.7 to 1.8 million species have been identified and described to date.
Solution approach
- Correct Answer + Core Reason: 1.7-1.8 million. This is the estimated number of species identified and described so far.
Step-by-Step Solution:
Step 1: Recall the estimated number of identified and described species.
Step 2: Identify the correct range.
Step 3: The current estimate is between 1.7 and 1.8 million species.
Why other options are wrong:
- Option A: 17 million is a significant overestimate.
- Option C: 0.2 million is an underestimate.
- Option D: 5 million is an overestimate.
Key Concepts:
- Biodiversity
- Species identification
- Species description
Memory Aids:
- Remember the approximate range: around 1.7-1.8 million
Quick Tips:
- Stay updated on current biodiversity estimates.
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Analyzing
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Select the odd one from the following.
View answer and explanation
Correct option: D
sapiens
Option D (sapiens) is the odd one because familiaris, lupus, and aureus are specific epithets, while sapiens is also a specific epithet but refers to a different genus (Homo).
Solution approach
- Correct Answer + Core Reason: sapiens. familiaris, lupus, and aureus are specific epithets within the same genus (Canis), while sapiens is the specific epithet for Homo.
Step-by-Step Solution:
Step 1: Identify the given terms as specific epithets.
Step 2: Determine the genus to which each specific epithet belongs.
Step 3: familiaris: Canis familiaris (domestic dog)\nlupus: Canis lupus (wolf)\naureus: Canis aureus (golden jackal)\nsapiens: Homo sapiens (human)
Step 4: sapiens belongs to a different genus (Homo) than the other three (Canis).
Why other options are wrong:
- Option A: familiaris belongs to the genus Canis.
- Option B: lupus belongs to the genus Canis.
- Option C: aureus belongs to the genus Canis.
Key Concepts:
- Binomial nomenclature
- Specific epithet
- Genus
Memory Aids:
- Remember that the genus name is always capitalized, and the specific epithet is not.
Quick Tips:
- Pay attention to the genus and species names when comparing organisms.
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Analyzing
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Study the following regarding the preparation of herbarium
sheets.
(i) Plant should be collected in flowering stage.
(ii) Every detail regarding the plant such as locality,
ecological conditions, vegetative and floral characters,
etc. should be noted.
(iii) Plants are evenly pressed by unfolding all the plant
parts between blotting papers (or newspapers) with the
help of plant pressers.
(iv) Blotting papers need not be changed until the plant gets
dried.
(v) After drying, the plant specimen is carefully
mounted/pasted on the herbarium sheets.
(vi) The herbarium sheet is labeled on the lower right hand
corner representing the number of plant specimen, date
of collection etc.
Which of the above statement is/are not correct?
sheets.
(i) Plant should be collected in flowering stage.
(ii) Every detail regarding the plant such as locality,
ecological conditions, vegetative and floral characters,
etc. should be noted.
(iii) Plants are evenly pressed by unfolding all the plant
parts between blotting papers (or newspapers) with the
help of plant pressers.
(iv) Blotting papers need not be changed until the plant gets
dried.
(v) After drying, the plant specimen is carefully
mounted/pasted on the herbarium sheets.
(vi) The herbarium sheet is labeled on the lower right hand
corner representing the number of plant specimen, date
of collection etc.
Which of the above statement is/are not correct?
View answer and explanation
Correct option: A
(i) only
Option B ((iv) only) is correct because blotting papers need to be changed frequently during the drying process to ensure proper preservation.
Solution approach
- Correct Answer + Core Reason: (iv) only. Blotting papers must be changed regularly during drying.
Step-by-Step Solution:
Step 1: Evaluate statement (i): Plant should be collected in flowering stage. This is generally correct, but not always necessary. Sometimes fruiting or vegetative stages are also collected.
Step 2: Evaluate statement (ii): Every detail regarding the plant such as locality, ecological conditions, vegetative and floral characters, etc. should be noted. This is correct.
Step 3: Evaluate statement (iii): Plants are evenly pressed by unfolding all the plant parts between blotting papers (or newspapers) with the help of plant pressers. This is correct.
Step 4: Evaluate statement (iv): Blotting papers need not be changed until the plant gets dried. This is incorrect. Blotting papers need to be changed regularly to absorb moisture.
Step 5: Evaluate statement (v): After drying, the plant specimen is carefully mounted/pasted on the herbarium sheets. This is correct.
Step 6: Evaluate statement (vi): The herbarium sheet is labeled on the lower right hand corner representing the number of plant specimen, date of collection etc. This is correct.
Why other options are wrong:
- Option A: Statement (i) is not entirely incorrect, as flowering stage is preferred but not mandatory.
- Option C: Statement (i) is not entirely incorrect, as flowering stage is preferred but not mandatory.
- Option D: Statement (iii) is correct.
Key Concepts:
- Herbarium preparation
- Plant preservation
Memory Aids:
- Remember that moisture is the enemy of preservation, so blotting papers must be changed frequently.
Quick Tips:
- Consider the purpose of each step in herbarium preparation and how it contributes to long-term preservation.
Revision notes and key takeaways
Review LIVING WORLD in your textbook or class notes, then use this set to check your understanding.
Showing 61-65 of 65 questions