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Biological Classification · Question 35

NEET 2016 (Phase 2)MCQEasy📈 Topic in 12% papers+4−1
1

Select the wrong statement.

  1. The walls of diatoms are easily destructible.
  2. 'Diatomaceous earth' is formed by the cell walls of diatoms.
  3. Diatoms are chief producers in the oceans.
  4. Diatoms are microscopic and float passively in water.

Answer

(1) The walls of diatoms are easily destructible.

Solution

As per NCERT, in diatoms the cell walls form two thin overlapping shells which fit together as in a soap box. The walls are embedded with silica and thus the walls are indestructible.

⇒ Diatoms have left behind large amounts of cell wall deposits in their habitat; this accumulation over billions of years is referred to as 'diatomaceous earth'.

∵ Diatoms are microscopic, float passively in water currents (plankton) and are the chief 'producers' in the oceans,

∴ statements (2), (3) and (4) are correct, and statement (1) is wrong.

Answer: (1)

NEET 2016 (Phase 2)

Keep practising — Biological Classification

2

Which one is a wrong statement?

  1. Haploid endosperm is typical feature of Gymnosperms.
  2. Brown algae have chlorophyll a and c and fucoxanthin.
  3. Archegonia are found in Bryophyta, Pteridophyta and Gymnosperms.
  4. Mucor has biflagellate zoospores.
AIPMT 2015
3

Select the wrong statement.

  1. The term ' contagium vivum fluidum' was coined by M. W. Beijerinck.
  2. Mosaic disease in tobacco and AIDS in human being are caused by viruses.
  3. The viroids were discovered by D.J. Ivanowsky.
  4. W.M. Stanley showed that viruses could be crystallised.
AIPMT 2015
4

In which group of organisms the cell walls form two thin overlapping shells which fit together?

  1. Dinoflagellates
  2. Slime moulds
  3. Chrysophytes
  4. Euglenoids
AIPMT 2015
5

Pick up the wrong statement.

  1. Some fungi are edible.
  2. Nuclear membrane is present in Monera.
  3. Cell wall is absent in Animalia.
  4. Protists have photosynthetic and heterotrophic modes of nutrition.
AIPMT 2015
6

Choose the wrong statement.

  1. Morels and truffles are poisonous mushrooms.
  2. Yeast is unicellular and useful in fermentation.
  3. Penicillium is multicellular and produces antibiotics.
  4. Neurospora is used in the study of bio-chemical genetics.
AIPMT 2015
7

Cell wall is absent in

  1. Mycoplasma
  2. Nostoc
  3. Aspergillus
  4. Funaria.
AIPMT 2015
8

The imperfect fungi which are decomposers of litter and help in mineral cycling belong to

  1. Ascomycetes
  2. Phycomycetes
  3. Basidiomycetes
  4. Deuteromycetes
AIPMT 2015
9

True nucleus is absent in

  1. Vaucheria
  2. Volvox
  3. Anabaena
  4. Mucor.
AIPMT 2015 (Cancelled)
10

Which one of the following matches is correct?

  1. Mucor – Reproduction by conjugation – Ascomycetes
  2. Agaricus – Parasitic fungus – Basidiomycetes
  3. Phytophthora – Aseptate mycelium – Basidiomycetes
  4. Alternaria – Sexual reproduction absent – Deuteromycetes
AIPMT 2015 (Cancelled)
11

Five kingdom system of classification suggested by R.H. Whittaker is not based on

  1. presence or absence of a well defined nucleus
  2. mode of reproduction
  3. mode of nutrition
  4. complexity of body organisation.
AIPMT 2014

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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
Other chaptersBiomolecules (Biology)