SSC CGL Science – Classification of Living Organisms – Level 2 · Exam Level · Tier I Sprint

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SSC CGL Science – Classification of Living Organisms – Level 2 · Exam Level · Tier I Sprint – 15 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
Diagram-basedIn the identification key shown, which plant group should be written at R?

Correct Answer: A [Pteridophytes]

Explanation:

Has xylem and phloem but no seeds → pteridophytes.

2.  
Diagram-basedIn the same key, the letter that stands for gymnosperms is:

Correct Answer: C [S]

Explanation:

Vascular → seeds → not in fruit → gymnosperms = S.

3.  
Match the followingMatch the genus with the animal:
P. Apis Q. Bombyx R. Pila S. Asterias
1. Apple snail 2. Starfish 3. Honey bee 4. Silkworm

Correct Answer: D [P-3, Q-4, R-1, S-2]

Explanation:

Apis – honey bee; Bombyx – silkworm; Pila – apple snail; Asterias – starfish.

4.  
Chronological orderArrange in chronological order:
Diener discovers viroids; Ivanowsky's tobacco mosaic study; Whittaker's five kingdoms; Stanley crystallises viruses

Correct Answer: B [Ivanowsky's tobacco mosaic study → Stanley crystallises viruses → Whittaker's five kingdoms → Diener discovers viroids]

Explanation:

Answer: Ivanowsky's tobacco mosaic study → Stanley crystallises viruses → Whittaker's five kingdoms → Diener discovers viroids. 1892 → 1935 → 1969 → 1971.

5.  
Assertion–ReasonAssertion (A): Bats are mammals.
Reason (R): Bats can fly.

Correct Answer: B [Both A and R are true but R is not the correct explanation of A]

Explanation:

Both true, but bats are mammals because they have hair and mammary glands – not because they fly (birds also fly).

6.  
Odd one out

Correct Answer: A [Flying fish]

Explanation:

Flying fish (Exocoetus) is a true bony fish; silverfish is an insect, crayfish a crustacean and cuttlefish a mollusc.

7.  
Spot My MistakeA student writes the lion's scientific name as Panthera Leo. Which rule of binomial nomenclature has been broken?

Correct Answer: C [The species name must begin with a small letter]

Explanation:

Correct form: Panthera (capital) leo (small), italic; handwritten names are underlined separately.

8.  
Two-quantity comparison
Quantity I: number of heart chambers in a crocodile
Quantity II: number of heart chambers in a frog

Correct Answer: A [Quantity I > Quantity II]

Explanation:

Answer: Quantity I > Quantity II. Crocodile 4 > frog 3.

9.  
A lichen is a partnership between:

Correct Answer: B [an alga and a fungus]

Explanation:

Lichen = alga + fungus; fungus + root = mycorrhiza.

10.  
Which of these organisms belongs to the kingdom Monera?

Correct Answer: D [Nostoc]

Explanation:

Nostoc is a cyanobacterium (prokaryote) – kingdom Monera; yeast and mushroom are fungi, Amoeba is a protist.

11.  
Spot My Mistake“The platypus is a reptile because it lays eggs.” What is wrong?

Correct Answer: D [The platypus is an egg-laying mammal – it has hair and mammary glands]

Explanation:

Egg-laying alone does not decide the class; mammary glands do.

12.  
Reverse questionThe answer is “Bryophytes”. Which question does it answer?

Correct Answer: C [Which plant group is called the amphibians of the plant kingdom?]

Explanation:

Bryophytes live on land but need water for reproduction.

13.  
Archaebacteria that live in hot springs are called:

Correct Answer: A [Thermoacidophiles]

Explanation:

Thermoacidophiles – hot, acidic springs; halophiles – salty areas; methanogens – marshes and cattle gut.

14.  
True/False drillhow many are TRUE?
I. Mycoplasma has no cell wall.
II. Viruses are placed in kingdom Monera.
III. Yeast is a unicellular fungus.

Correct Answer: B [Two]

Explanation:

I and III true; viruses are not placed in any kingdom.

15.  
Fill in the blankThe antibiotic penicillin is obtained from the fungus ______.

Correct Answer: A [Penicillium]

Explanation:

Penicillium; Puccinia – wheat rust; Albugo – on mustard; Rhizopus – bread mould.

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