Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice plant diseases keeping diseases away biology

Consider the following:
1. Bacillus subtilis                 2. Trichadiama viride
3. erysiphe graminis             4. Septoria glycines
Which of the above antagonistic orgaanisms is /are capable of suppressing plant disease?

  1. 1 and 2

  2. 2 and 3

  3. 2, 3 and 4

  4. 1 only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacillus subtilis and Trichoderma viride are well-documented biological control agents used to suppress various plant pathogens.

Multiple choice plant diseases keeping diseases away biology

Match List-I with List-II and select the correct answer using the codes given the lists.

List-I(Disease) List-II(Pathogen)
a. Bacterial blight of paddy $1$. Pseudomonas
b. Brown rot of potato $2$. Corynebacterium
c. Tundu disease of wheat $3$. Erwinia
d. Fire blight of apples $4$. Xanthomonas
  1. A-$1$, B-$2$, C-$3$, D-$4$
  2. A-$4$, B-$1$, C-$2$, D-$3$
  3. A-$3$, B-$2$, C-$1$, D-$4$
  4. A-$2$, B-$3$, C-$4$, D-$1$
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice plant diseases keeping diseases away biology

Which one of the following is a disease caused by zinc deficiency?

  1. Die back of rice

  2. Khaira disease of rice

  3. Black heart of potato

  4. Brown spot of rice
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Khaira disease of rice is classically characterized by chlorotic patches that turn brown, caused specifically by a deficiency of zinc. The other listed options correspond to different nutritional disorders or fungal pathogens, such as black heart of potato being caused by oxygen deficiency.

Multiple choice plant diseases keeping diseases away biology

Which of the following pairs are correctly matched? Disease Causal organism.
a. Kamal bunt of wheat - Fungus
b. Khaira disease of rice- Bacterium
c. Fiji disease of sugarcane- Virus
d. Purple top of potato-Mycoplasma
Select the correct answer from the codes given.

  1. $1, 2$ and $4$
  2. $2, 3$ and $4$
  3. $1, 3$ and $4$
  4. $1, 2$ and $3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Kamal bunt of wheat is caused by a fungus (Tilletia indica), Fiji disease of sugarcane is caused by a virus, and purple top of potato is caused by phytoplasma (mycoplasma). Khaira disease of rice is caused by zinc deficiency, not a bacterium, making statement 2 incorrect.

Multiple choice plant diseases keeping diseases away biology

The toxic substance produced by the pathogen causing Brown leaf spot of rice, harming seedlings reducing respiration of the host is?

  1. Piricularian

  2. A-Picolinic acid

  3. Cochliobolin

  4. Ferulic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice plant diseases keeping diseases away biology

Consider the following diseases of plants.
a. Root knot of sugar-cane.
b. Root rot of wheat.
c. Wilt of cotton.
d. Angular leaf spot of cotton.
Which of these diseases is/are caused by fungi?

  1. $1$ and $4$ only
  2. $2$ only
  3. $2$ and $3$
  4. $1, 3$ and $4$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Root rot of wheat is caused by fungal pathogens such as Fusarium or Rhizoctonia species, and wilt of cotton is caused by the fungus Fusarium oxysporum. Root knot of sugar-cane is typically nematode-induced, and angular leaf spot of cotton is bacterial.

Multiple choice plant diseases keeping diseases away biology

Which one of the following pairs is not correctly matched?

  1. Flag smut of wheat - Ustilago nude tritici

  2. Karnal bunt of wheat- Tilletia barclayana

  3. Brown rust of wheat- Puccinia recondite

  4. Powdery mildew of wheat- Erysiphe graminis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Flag smut of wheat is caused by Urocystis agropyri, not Ustilago nuda tritici (which causes loose smut). Thus, this pair is incorrectly matched.

Multiple choice plant diseases keeping diseases away biology

Which one of the following diseases of rice is not caused by microbe?

  1. Tip burn of paddy

  2. Stem rot of paddy

  3. False smut of paddy

  4. Blast disease of rise
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tip burn of paddy is a physiological disorder caused by environmental factors like high temperature or water stress, not by a living microbe. In contrast, stem rot, false smut, and blast are all caused by fungal pathogens.

Multiple choice plant diseases keeping diseases away biology

Which one of the following pairs is not correctly matched?

  1. Tikka disease of groundnut-Cercospora personata

  2. Blast of rice-Ephelis oryzae

  3. Red rot of sugar-cane-Collectotrichum falcatum

  4. Early blight of potato-Alternaria Solani
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blast of rice is caused by the fungus Magnaporthe oryzae, previously known as Pyricularia oryzae, rather than Ephelis oryzae. The other three pairs correctly match the disease name with its actual fungal causal organism.

Multiple choice plant diseases keeping diseases away biology

Which one of the following pairs of plant diseases and symptoms is correctly matched?

  1. Rice infected with Helminthosporium Oryzae- Blight

  2. Jute infected with Macrphoming Phaseolina- Club root

  3. Crucifer infected with Plasmodiophora Brassicae- Rot

  4. Potato infected with Synchytrium- Endobioticum wart
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Potato wart disease is famously caused by the chytrid fungus Synchytrium endobioticum, which produces characteristic wart-like outgrowths on tubers. The other choices feature mismatched symptoms or incorrect pathogen-host pairings.