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Biological Classification · Question 111

AIPMT 2001MCQEasy📈 Topic in 25% papers+4−1
1

What is true for archaebacteria?

  1. All halophiles
  2. All photosynthetics
  3. All fossils
  4. Oldest living beings

Answer

(4) Oldest living beings

Solution

As per NCERT, archaebacteria are special bacteria that live in some of the most harsh habitats: extreme salty areas (halophiles), hot springs (thermoacidophiles) and marshy areas (methanogens).

⇒ Not all are halophiles, and they are not photosynthetic.

∵ They are living organisms, they are not 'all fossils'.

Archaebacteria are regarded as the oldest living organisms (most primitive living beings), as their habitats resemble the conditions of the early Earth.

∴ Archaebacteria are the oldest living beings.

Answer: (4)

AIPMT 2001

Keep practising — Biological Classification

2

Adhesive pad of fungi penetrates the host with the help of

  1. mechanical pressure and enzymes
  2. hooks and suckers
  3. softening by enzymes
  4. only by mechanical pressure
AIPMT 2001
3

What is true for photolithotrophs?

  1. Obtain energy from radiations and hydrogen from organic compounds
  2. Obtain energy from radiations and hydrogen from inorganic compounds
  3. Obtain energy from organic compounds
  4. Obtain energy from inorganic compounds
AIPMT 2001
4

Black rust of wheat is caused by

  1. Puccinia
  2. Ustilago
  3. Albugo
  4. Phytophthora.
AIPMT 2000
5

Enzymes are not found in

  1. fungi
  2. algae
  3. virus
  4. cyanobacteria.
AIPMT 2000
6

Which disease of man is similar to cattle's bovine spongiform encephalopathy?

  1. Spongiocitis of cerebrum
  2. Encephalitis
  3. Spondylitis
  4. Jakob–Creutzfeldt disease
AIPMT 2000

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