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General ScienceEasyAsked in: NDA · NDA-I 2022, GAT

Which one of the following belongs to 'Pisces'?

  1. A.Dogfish
  2. B.Jellyfish
  3. C.Silverfish
  4. D.Starfish

Correct answer

A. Dogfish

Explanation

The correct answer is A, Dogfish. The dogfish is a small shark, and sharks are true fishes of the class Pisces.

Pisces are aquatic vertebrates that breathe through gills, swim with fins and usually have scales. The dogfish (Scoliodon) has a skeleton of cartilage, so it belongs to the cartilaginous fishes, the Chondrichthyes, along with sharks and rays. Many animals carry 'fish' in their common name without being fish at all, and a paper setter uses exactly these to test the idea of a vertebrate with gills and fins.

B is wrong because the jellyfish is a cnidarian (coelenterate) with no backbone.

C is wrong because the silverfish is a small wingless insect found in books and damp corners.

D is wrong because the starfish is an echinoderm, a spiny-skinned invertebrate with tube feet.

Exam tip: dogfish, seahorse and flying fish are fishes; jellyfish, starfish, silverfish and cuttlefish are not.

Practice Questions

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Q1.General ScienceAsked in: UPSC Civil Services · CSE Prelims 2022, GS Paper IMedium

Which of the following are nitrogen-fixing plants?

1. Alfalfa

2. Amaranth

3. Chickpea

4. Clover

5. Purslane (Kulfa)

6. Spinach

Select the correct answer using the code given below:

  1. A.1, 3 and 4 only
  2. B.1, 3, 5 and 6 only
  3. C.2, 4, 5 and 6 only
  4. D.1, 2, 4, 5 and 6
Show answer
Correct answer: A. 1, 3 and 4 only

Alfalfa, chickpea and clover are legumes, and legumes fix nitrogen. Plants of the legume family (Fabaceae) carry root nodules that house Rhizobium bacteria.

Q2.General ScienceAsked in: UPSC CAPF · CAPF 2017, Paper IMedium

The mass number of an element is NOT changed when it emits

  1. A.Alpha and Beta radiations only
  2. B.Alpha and Gamma radiations only
  3. C.Beta and Gamma radiations only
  4. D.Alpha, Beta and Gamma radiations
Show answer
Correct answer: C. Beta and Gamma radiations only

Neither beta nor gamma emission changes the total number of protons and neutrons in a nucleus, so the mass number stays the same.

Q3.General ScienceAsked in: UPSC CAPF · CAPF 2025, Paper IMedium

Which one among the following statements about facilitated transport in plants is correct?

  1. A.All passive transports are types of facilitated transport.
  2. B.Facilitated transport is an example of active transport.
  3. C.Water moves across plasma membrane by active transport.
  4. D.Facilitated transport requires assistance of carrier proteins.
Show answer
Correct answer: D. Facilitated transport requires assistance of carrier proteins.

In facilitated transport, molecules cross the membrane with the help of membrane proteins, while still moving down their concentration gradient.

Q4.General ScienceAsked in: UPSC CAPF · CAPF 2017, Paper IMedium

Who among the following has coined the term 'Quark', the fundamental particles that make up protons and neutrons in an atomic nucleus ?

  1. A.Richard Feynman
  2. B.Murray Gell-Mann
  3. C.Albert Einstein
  4. D.Niels Bohr
Show answer
Correct answer: B. Murray Gell-Mann

The American physicist Murray Gell-Mann proposed quarks in 1964 and gave them their name. Gell-Mann, and independently George Zweig, suggested that protons, neutrons and other such particles are built from smaller units.