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Biological Classification · Question 84

AIPMT 2006MCQEasy📈 Topic in 38% papers+4−1
1

Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread? Choose the answer from the following options.

  1. B, C and F only
  2. A, C and E only
  3. A, D and E only
  4. B, D and E only

Answer

(3) A, D and E only

Solution

As per NCERT, fungi prefer to grow in warm and humid places; Mucor is a saprophytic phycomycete that grows on moist bread.

∵ Warm temperature ⇒ about 25 C (A) is suitable, while 5 C (B) slows growth.

∵ Humid conditions ⇒ relative humidity of about 95% (D) is needed, not 5% (C).

∵ Fungi are not photosynthetic and moisture is retained in shade ⇒ a shady place (E) is favourable, not a brightly illuminated place (F).

∴ The conditions are A, D and E.

Answer: (3)

AIPMT 2006

Keep practising — Biological Classification

2

What is common about Trypanosoma, Noctiluca, Monocystis and Giardia?

  1. These are all parasites
  2. These are all unicellular protists
  3. They have flagella
  4. They produce spores
AIPMT 2006
3

The causative agent of mad-cow disease is a-

  1. Virus
  2. Bacterium
  3. Prion
  4. Worm
AIPMT 2006
4

The bacterium ( Clostridium botulinum) that causes botulism is-

  1. A facultative aerobe
  2. An obligate aerobe
  3. A facultative anaerobe
  4. An obligate anaerobe
AIPMT 2006
5

Barophilic prokaryotes

  1. grow and multiply in very deep marine sediments
  2. occur in water containing high concentrations of barium hydroxide
  3. readily grow and divide in sea water enriched in any soluble salt of barium
  4. grow slowly in highly alkaline frozen lakes at high altitudes.
AIPMT 2005
6

There exists a close association between the alga and the fungus within a lichen. The fungus

  1. provides protection, anchorage and absorption for the alga
  2. provides food for the alga
  3. fixes the atmospheric nitrogen for the alga
  4. releases oxygen for the alga
AIPMT 2005
7

Auxospores and hormogonia are formed, respectively, by

  1. some diatoms and several cyanobacteria
  2. some cyanobacteria and many diatoms
  3. several cyanobacteria and several diatoms
  4. several diatoms and a few cyanobacteria.
AIPMT 2005
8

Match items in column I with those in column II. Select the correct answer from the following.

  1. (A) - (L); (B) - (J); (C) - (M); (D) - (N); (E) - (K)
  2. (A) - (K); (B) - (J); (C) - (L); (D) - (M); (E) - (N)
  3. (A) - (N); (B) - (L); (C) - (K); (D) - (N); (E) - (J)
  4. (A) - (J); (B) - (K); (C) - (N); (D) - (L); (E) - (K)
AIPMT 2005
9

Which of the following unicellular organisms has a macronucleus for trophic function and one or more micronuclei for reproduction?

  1. Euglena
  2. Amoeba
  3. Paramecium
  4. Trypanosoma
AIPMT 2005
10

Which of the following statements is not true for retroviruses?

  1. DNA is not present at any stage in the life cycle of retroviruses.
  2. Retroviruses carry gene for RNA-dependent DNA polymerase.
  3. The genetic material in mature retroviruses is RNA.
  4. Retroviruses are causative agents for certain kinds of cancer in man.
AIPMT 2004
11

Viruses that infect bacteria multiply and cause their lysis, are called

  1. lysozymes
  2. lipolytic
  3. lytic
  4. lysogenic
AIPMT 2004

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