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Biological Classification · Question 90

AIPMT 2005MCQHard📈 Topic in 12% papers+4−1
1

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.

Answer

(4) several diatoms and a few cyanobacteria.

Solution

Auxospores are formed by diatoms: repeated division inside the rigid silica frustule makes the cells smaller, and the original size is restored through auxospore formation (common in several diatoms).

Hormogonia are short, motile pieces of a filament that break off and grow into new filaments — a mode of vegetative reproduction seen in a few filamentous cyanobacteria (e.g. Oscillatoria, Nostoc).

∴ Auxospores — several diatoms; hormogonia — a few cyanobacteria.

Answer: (4)

AIPMT 2005

Keep practising — Biological Classification

2

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
3

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
4

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
5

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

  1. lysozymes
  2. lipolytic
  3. lytic
  4. lysogenic
AIPMT 2004
6

Lichens are well known combination of an alga and a fungus where fungus has

  1. a saprophytic relationship with the alga
  2. an epiphytic relationship with the alga
  3. a parasitic relationship with alga
  4. a symbiotic relationship with alga
AIPMT 2004
7

When a fresh-water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will

  1. increase in number
  2. disappear
  3. increase in size
  4. decrease in size
AIPMT 2004
8

Which one of the following statements about viruses is correct?

  1. Viruses possess their own metabolic system.
  2. All viruses contain both RNA and DNA.
  3. Viruses are obligate parasites.
  4. Nucleic acid of viruses is known as capsid.
AIPMT 2003
9

Tobacco mosaic virus is a tubular filament of size

  1. 300 10 nm
  2. 300 5 nm
  3. 300 20 nm
  4. 700 30 nm
AIPMT 2003
10

Viruses are no more "alive" than isolated chromosomes because

  1. they require both RNA and DNA
  2. they both need food molecules
  3. they both require oxygen for respiration
  4. both require the environment of a cell to replicate.
AIPMT 2003
11

In which kingdom would you classify the archaea and nitrogen-fixing organisms, if the five-kingdom system of classification is used?

  1. Plantae
  2. Fungi
  3. Protista
  4. Monera
AIPMT 2003

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All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
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