Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice plant diseases keeping diseases away biology

Which of the following diseases is caused by bacteria?

  1. Tobacco mosaic

  2. Black rot of crucifers

  3. Red rot of sugarcane

  4. Late blight of potato
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Black rot of crucifers is caused by Xanthomonas campestris pv. campestris a bacterial disease common to all cruciferous plants like Broccoli, cabbage, Kale etc. Infecting the stem, leaf, inflorescence and roots.

So, the correct answer is 'Black rot of crucifers'

Multiple choice plant diseases keeping diseases away biology

Pyricularia oryzae causes

  1. Citrus canker

  2. Blast disease of rice

  3. Tungro disease of rice

  4. Tikka disease of groundnut
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pyricularia oryzae is a fungus that causes rice blast that results in lesions on leaves, stems, peduncles, panicles, seeds, and even roots. 

A. Citrus canker is caused by the bacterium Xanthomonas axonopodis. 
B. Blast disease of rice is caused by Pyricularia oryzae.
C. Tungro disease of rice is caused by the virus pararetrovirus of the family Caulimoviridae.
D. Tikka disease of groundnut is caused by the Cercospora personata.
Hence, the correct answer is 'Blast disease of rice'

Multiple choice plant diseases keeping diseases away biology

Which of the following diseases is caused by virus?

  1. Tabacco mosaic

  2. Late blight of potato

  3. Turnip mosaic

  4. Both (a) and (c)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tobacco mosaic virus (TMV) is a rod shaped virus, infecting tobacco leaves. It symptoms are mottled appearance that is patches of yellow and green, dwarfing etc. It spreads by mechanical abrasion of the infected tissue with a healthy one.

Turnip mosaic virus (TuMV) is a virus that causes diseases in members of Cruciferae family. It is spread by aphids.
So, the correct answer is 'Both (a) and (c)'

Multiple choice plant diseases keeping diseases away biology

Khaira is a plant disease caused due to the deficiency of

  1. Zinc

  2. Carbon

  3. Iron

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Zinc sulfate corrects the disorder of the rice plant called as Khaira disease seen in India.

So, the correct option is 'Zinc'.

Multiple choice plant diseases keeping diseases away biology

Which of the following is not a fungal disease?

  1. Red rot of sugarcane

  2. Wilt of arhar

  3. Brown leaf spot of rice

  4. Potato mosaic
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Potatoes may be infected with many different viruses that can reduce tuber quality and yield. Mosaic virus of potatoes is one such disease that actually has multiple strains. Potato mosaic virus is divided into three categories. Symptoms of the different mosaic virus of potatoes may be similar, so the actual type usually can’t be identified by symptoms alone and is often just referred to as mosaic virus in potatoes. The three types of recognized mosaic virus in potatoes are Latent (Potato virus X), Mild (Potato virus A), Rugose or Common mosaic (Potato virus Y).

So the correct option is 'potato mosaic'.


Multiple choice biology biological molecules fats fats and their test food for health

How many calories does fat provide:

  1. 14 Kcal/g or 17 KJ/g

  2. 9 Kcal/g or 38 KJ/g

  3. 6 Kcal/g or 25 KJ/g

  4. 4 Kcal/g or 17 KJ/g.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is option B i.e. "9 Kcal/g or 38 KJ/g"
A calorie is a unit of energy that measures how much energy food provides to the body. The body needs calories to function properly. Fats are nutrients in food that the body uses to build cell membranes, nerve tissue (like the brain), and hormones. A gram of fat has about 9 calories, while a gram of carbohydrate or protein has about 4 calories.

Multiple choice biology environmental factors soil-nature climate factors abiotic components

In most areas, the warmest time of the day about 5 feet above the ground occurs:

  1. Around noon

  2. In the afternoon between 3 and 5 PM

  3. In the early evening after 6 PM

  4. Just before the sun sets
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The warmest time of the day occurs in the afternoon because there is a lag between the time of maximum solar radiation (noon) and the time when the ground and air reach their peak temperature due to heat absorption and re-radiation processes.

Multiple choice biology environmental factors soil-nature climate factors abiotic components

Suppose last night was clear and calm. Tonight low clouds will be present. From this you would conclude that tonight's minimum temperature will be:

  1. Higher than last night's minimum temperature

  2. Lower than last night's minimum temperature

  3. The same as last night's minimum temperature

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

Clouds act as a blanket that traps longwave radiation emitted by the Earth's surface. Therefore, a cloudy night prevents heat from escaping into space, resulting in a higher minimum temperature compared to a clear, calm night.

Multiple choice biology environmental factors soil-nature climate factors abiotic components

Which of the following is present in maximum amount in atmosphere ____________.

  1. Oxygen

  2. Nitrogen

  3. Carbon dioxide

  4. Hydrogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
78.03% of the atmosphere consists of Nitrogen. Some is being added to it through volcanic eruptions, erosion of sedimentary rocks and recycled through denitrification.
So, the correct answer is 'Nitrogen'