SSC CGL Science – Genetics, Evolution & Plant Biology – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Genetics, Evolution & Plant Biology – Level 1 · Warm-up · Tier I Level – 14 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.  
Mendel's work was rediscovered in 1900 by:

Correct Answer: C [de Vries, Correns and von Tschermak]

Explanation:

Three botanists independently rediscovered Mendel's laws in 1900.

2.  
Mendel performed his experiments on:

Correct Answer: A [Garden pea]

Explanation:

Answer: Garden pea. Pisum sativum .

3.  
The genotypic ratio in the F2 of a monohybrid cross (Tt × Tt) is:

Correct Answer: B [1 : 2 : 1]

Explanation:

Answer: 1 : 2 : 1. 1 TT : 2 Tt : 1 tt.

4.  
How many pairs of autosomes are present in a normal human body cell?

Correct Answer: D [22]

Explanation:

23 pairs in all: 22 pairs of autosomes + 1 pair of sex chromosomes.

5.  
A normal human egg (ovum) always carries which sex chromosome?

Correct Answer: C [X]

Explanation:

A mother is XX, so every egg carries X; sperm carry X or Y.

6.  
Which base is present in RNA but not in DNA?

Correct Answer: B [Uracil]

Explanation:

Answer: Uracil. RNA has U in place of T.

7.  
The double-helix model of DNA was proposed by:

Correct Answer: D [Watson and Crick]

Explanation:

Answer: Watson and Crick. 1953.

8.  
The theory of natural selection was proposed by:

Correct Answer: A [Charles Darwin]

Explanation:

Darwin – On the Origin of Species (1859).

9.  
The splitting of water (photolysis) in photosynthesis takes place in the:

Correct Answer: B [Grana (thylakoids) of the chloroplast]

Explanation:

Light reaction in the grana; the Calvin cycle runs in the stroma.

10.  
Which plant hormone helps in the ripening of fruits?

Correct Answer: C [Ethylene]

Explanation:

Answer: Ethylene. Ethylene – a gas.

11.  
Fill in the blankHaemophilia is a ______ disorder.

Correct Answer: D [sex-linked (X-linked)]

Explanation:

Haemophilia – X-linked recessive.

12.  
Down's syndrome is caused by an extra copy of chromosome number:

Correct Answer: A [21]

Explanation:

Answer: 21. Trisomy 21.

13.  
The green pigment that absorbs light for photosynthesis is:

Correct Answer: D [Chlorophyll]

Explanation:

Answer: Chlorophyll. Chlorophyll in chloroplasts.

14.  
True/False drillhow many are TRUE?
I. Adenine pairs with thymine in DNA.
II. Lamarck proposed natural selection.
III. Birds have ZW females.
IV. Phloem carries water from the roots.

Correct Answer: A [Two]

Explanation:

II false (Darwin); IV false (xylem carries water).

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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