Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice plant diseases keeping diseases away biology

Crown gall disease enhances ________________.

  1. Meristematic activity

  2. Development of chloroplasts

  3. Reduction in leaf size

  4. Alteration in the morphology of flowers
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Crown gall disease involves the transfer of T-DNA into the plant genome, which causes the plant cells to produce auxins and cytokinins, leading to excessive meristematic activity and tumor growth.

Multiple choice plant diseases keeping diseases away biology

Which one of the following diseases is caused by mycoplasma-like organism?

  1. Sugarcane mosaic disease

  2. Wilt disease of sugarcane

  3. Ring spot of sugarcane

  4. Grassy shoot of sugarcane
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Grassy shoot disease of sugarcane is a classic phytoplasma disease, formerly known as a mycoplasma-like organism (MLO) infection. Mosaic, wilt, and ring spot of sugarcane are caused by viruses or fungi.

Multiple choice plant diseases keeping diseases away biology

Which of the following is not a viral disease of plants?

  1. Red rot of sugarcane

  2. Tobacco mosaic disease

  3. Leaf curl of tomato

  4. Tristeza disease of citrus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Red decay is the most widely recognized infection of sugarcane, caused by the growth Colletotrichum falcatum Went. 

So, the correct option is 'Red rot of sugarcane'.

Multiple choice plant diseases keeping diseases away biology

In plants, mosaic formation, leaf rolling and curling, yellowing of plant parts, vein clearing, dwarfing and stunted growth, necrosis etc. are the symptoms of

  1. bacterial diseases

  2. mycoplasmal diseases

  3. viral diseases

  4. fungal diseases.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cucumber mosaic virus causes yellowing and mottling in Gerbera leaves. The CMV disease is described by extreme chlorotic mosaic, greening of veins on leaves, shading breaking in florets achieved with blossom disfigurements, and poor development of the sprout.

So, the correct option is 'viral diseases'.

Multiple choice plant diseases keeping diseases away biology

Which one of the following fungi has been found useful in the biological control of plant diseases?

  1. Penicillium notatum

  2. Phytophthora parasitica

  3. Trichoderma viride

  4. Mucor mucedo
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Trichoderma viride is a well-known antagonistic fungus widely utilized as a biocontrol agent against various soil-borne plant pathogenic fungi. Penicillium notatum produces antibiotics primarily used against bacteria rather than being a plant disease biocontrol agent.

Multiple choice plant diseases keeping diseases away biology

A wheat plant is infected by the aecidiospores of black stem rust fungus produced on the alternate host. What is the correct sequence of the following stages in the disease cycle?
a. Uredo stage
b. Pycnidial stage
c. Basidial stage
d. Teleuto stage
e. Aecidial stage
Select the correct answer using the codes given.

  1. $1, 4, 3, 5, 2$
  2. $1, 3, 4, 5, 2$
  3. $1, 2, 3, 4, 5$
  4. $1, 4, 3, 2, 5$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the life cycle of Puccinia graminis, the stages on the cereal host and alternate host follow a strict sequence: uredo stage (1), teleuto stage (4), basidial stage (3), pycnidial stage on the alternate host (2), and aecidial stage (5).

Multiple choice plant diseases keeping diseases away biology

The well-known famine in Ireland in the $40$s has been attributed mainly to the failure of the potato crop which was infected by.

  1. Aleraria solani

  2. Phytophthora infestans

  3. Phytophtora parasitica

  4. Pythium aphanidermatum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The historic 1840s famine in Ireland was caused by the widespread destruction of potato crops due to late blight, which is caused by the oomycete Phytophthora infestans.

Multiple choice plant diseases keeping diseases away biology

Biological control of some soil-borne plant diseases has been achieved through the use of __________.

  1. Rhizobacteria

  2. Streptomyces

  3. Nostoc

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

Plant Growth-Promoting Rhizobacteria (PGPR) are extensively used for the biological control of soil-borne plant diseases.

Multiple choice plant diseases keeping diseases away biology

Which one of the following is a causal agent of wart disease of potato?

  1. Synchytrium and endobioticum

  2. Plasmodiophora brassicae

  3. Spongospora subterranea

  4. Pseudomonas solanacearum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Wart disease of potato is caused by Synchytrium endobioticum, a chytrid fungus. The correct scientific name should be written as two words: Synchytrium endobioticum. This pathogen causes tumor-like galls (warts) on potato tubers and is a quarantine disease in many regions. Plasmodiophora brassicae causes club root of crucifers, Spongospora subterranea causes powdery scab of potato, and Pseudomonas solanacearum causes bacterial wilt.

Multiple choice plant diseases keeping diseases away biology

Turnip mosaic disease is caused by

  1. Bacteria

  2. Viruses

  3. Nematodes

  4. Fungi
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Turnip Mosaic Disease is caused by the Turnip Mosaic Virus (TuMV), a potyvirus belonging to family potyviridae, that infects majority of plants belonging to Cruciferae or Brasscicaceae. They virus can be transmitted through vectors - Aphids.

So, the correct answer is 'Viruses'