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General ScienceEasyAsked in: NDA · NDA-I 2018, GAT

Which one of the following is the correct sequence of levels of hierarchy of classification of organisms from higher to lower ?

  1. A.Phylum - Class - Order - Family - Genus
  2. B.Phylum - Class - Family - Order - Genus
  3. C.Family - Order - Class - Species - Genus
  4. D.Class - Family - Order - Species - Genus

Correct answer

A. Phylum - Class - Order - Family - Genus

Explanation

The correct answer is A, Phylum - Class - Order - Family - Genus. This is the order of the taxonomic ranks from the broader group to the narrower one.

The full hierarchy set out by Linnaeus and used today runs Kingdom, Phylum (Division in plants), Class, Order, Family, Genus and Species. Each rank holds one or more ranks of the level below: a genus groups related species, a family groups related genera, and so on upward. The higher the rank, the more organisms it holds and the fewer features they share. Humans, for example, are in phylum Chordata, class Mammalia, order Primates, family Hominidae, genus Homo.

B is wrong because it puts Family above Order.

C is wrong because it runs from lower to higher and places Species above Genus.

D is wrong because it puts Family above Order and Species above Genus.

Exam tip: King Philip Came Over For Good Soup, that is, Kingdom, Phylum, Class, Order, Family, Genus, Species.

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.