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Biological Classification · Question 104

AIPMT 2002MCQMedium📈 Topic in 38% papers+4−1
1

Which fungal disease spreads by seed and flowers?

  1. Loose smut of wheat
  2. Corn smut
  3. Covered smut of barley
  4. Soft rot of potato

Answer

(1) Loose smut of wheat

Solution

Loose smut of wheat is caused by Ustilago tritici (a basidiomycete smut fungus).

⇒ Its spores are carried by wind to the open flowers of healthy wheat plants, where they germinate and infect the developing ovary (flower infection).

⇒ The mycelium remains dormant inside the embryo of the seed, so the disease is carried to the next crop through seed (internally seed-borne).

∵ Covered smut of barley is externally seed-borne (seedling infection), corn smut infects any young tissue locally, and soft rot of potato is a bacterial disease.

∴ Loose smut of wheat spreads by seed and flowers.

Answer: (1)

AIPMT 2002

Keep practising — Biological Classification

2

Which of the following secretes toxins during storage conditions of crop plants?

  1. Aspergillus
  2. Penicillium
  3. Fusarium
  4. Colletotrichum
AIPMT 2002
3

In which of the following animals dimorphic nucleus is found?

  1. Amoeba proteus
  2. Trypanosoma gambiense
  3. Plasmodium vivax
  4. Paramecium caudatum
AIPMT 2002
4

In protozoa like Amoeba and Paramecium, the organ for osmoregulation is

  1. contractile vacuole
  2. mitochondria
  3. nucleus
  4. food vacuole.
AIPMT 2002
5

Organisms which obtain energy by the oxidation of reduced inorganic compounds are called

  1. photoautotrophs
  2. chemoautotrophs
  3. saprozoic
  4. coproheterotrophs
AIPMT 2002
6

Cauliflower mosaic virus contains

  1. ss RNA
  2. ds RNA
  3. ds DNA
  4. ss DNA
AIPMT 2001
7

What is true for cyanobacteria?

  1. Oxygenic with nitrogenase
  2. Oxygenic without nitrogenase
  3. Non-oxygenic with nitrogenase
  4. Non-oxygenic without nitrogenase
AIPMT 2001
8

What is true for archaebacteria?

  1. All halophiles
  2. All photosynthetics
  3. All fossils
  4. Oldest living beings
AIPMT 2001
9

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
10

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
11

Black rust of wheat is caused by

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

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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
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