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Which of the following statements is not correct regarding jhum cultivation ?

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. It is also called as shifting cultivation and has resulted in deforestation.

  2. It helps in increasing crop yield to a considerable extent.

  3. A time-gap of several years is required for the recovery of the land after cultivation.

  4. It involves cutting down of trees of the forest, burning of the plant remains and then using the land for farming.

Show answer
Correct Option: B
Explanation:

Jhum cultivation which is popularly known as shifting cultivation is one of the oldest types of cultivation practices in India and is practised majorly in the northeastern states of India. This cultivation has a particular pattern that has to be followed according to the cycle or the period of Jhum cultivation.

Initially, the vegetation or the forest on the land is cleared where the cultivation needs to be practised and then the farming begins. After the harvest, the land is allowed to have its vegetation back.
Based on the above jhum cultivation will not help in increasing crop yield to a considerable extent.
So, the correct answer is 'It helps in increasing crop yield to a considerable extent.'

WhIch of the following is necessary for Improvement of the quality of crops?
1. Introduction
2. Hybridisation
3. Selection
4. Segregation

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. 1, 2 and 3

  2. 1, 2, 3 and 4

  3. 2, 3 and 4

  4. 2 and 3

Show answer
Correct Option: A
Explanation:
Development of the new variety of plant processing desirable characters from existing ones is known as plant breeding.
Plant introduction means introducing a plant having desirable characters which are a genetic improvement, high yield, disease resistance and vigorous growth from a region of a country where growth naturally to a region or a country where does not occur earlier.
Then the pure line selection is done.
Hybridization is a method of reducing new crop varieties in which two or more plants of unlike genetical constituents are fused together.

So, the correct option is '1, 2 and 3'



Shifting cultivators normally grow

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. Cash crops along with fodder

  2. The major crop along with cereals

  3. A single crop which is mainly consumed

  4. Grains, vegetable and tubers in rotation

Show answer
Correct Option: D
Explanation:
Shifting cultivation is an agricultural system in which a person uses a piece of land, only to abandon or alter the initial use a short time later. This system often involves clearing of a piece of land followed by several years of wood harvesting or farming until the soil loses fertility. Once the land becomes inadequate for crop production, it is left to be reclaimed by natural vegetation, or sometimes converted to a different long term cyclical farming practice. The period of cultivation is usually terminated when the soil shows signs of exhaustion or, more commonly, when the field is overrun by weeds. The length of time that a field is cultivated is usually shorter than the period over which the land is allowed to regenerate by lying fallow. Most families grow for subsistence purposes, just to eat and live. In other cases, the crops grown by each village vary by local customs and taste. The predominant crops include rice, maize (corn) and manioc and sorghum in Africa. Yams, sugarcane, plantain, and vegetables are also grown in some regions. 
So the correct option is 'grains, vegetable and tubers in rotation'.

Shifting cultivation or jhum belongs to category of

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. Industrial forestry

  2. Agroforestry

  3. Commercial forestry

  4. Social forestry

  5. Conservation forestry

Show answer
Correct Option: B
Explanation:

Slash and burn agriculture is also called as jhum cultivation or shifting cultivation. It is the process of growing crops in which the land of trees and vegetation are first cleared and then burned thereafter. The burnt soil contains potash which increases the nutrient value of the soil. It belongs to category of agroforestry.

Thus, the correct answer is 'Agroforestry.'

The thickness of soil layer used for terrace farming is

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. 9 cm

  2. 9 inch

  3. 9 meter

  4. 5 inch

Show answer
Correct Option: B
Explanation:
generally, the depth of soil required for the cultivation of plants in terrace farming is 20-25cms( 8-10 inches).
So, the correct answer is 'Option B-9 inches'.

Which of the following technique is used for rooftop gardening?

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. Hydroponics

  2. Aeroponics

  3. Green roof

  4. All of the above

Show answer
Correct Option: D
Explanation:

(A)Hydroponics is also called as a floating-raft system in which farming is done without using soil on a nutrient-rich solution. For Example, Mint, Tomato, Potato, Lettuce, Basil etc.

(B)Aeroponics is an indoor gardening method in which plants are grown in a mist environment. Tomato, Pepper, Cucumber, e.t.c are some of the examples
of Aeroponics.
(C)Green Roof Is a system of planting trees covered with vegetation and growing medium. Small grasses, Herbs, Flowering Plants, e.t.c are some of the examples of the Green roof.
So, the correct option is 'All of the above'.

Net house farming provides protection against

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. Insects

  2. Heat

  3. Strong wind

  4. Both A and C

Show answer
Correct Option: D
Explanation:
A Net house is a structure enclosed by agro nets or any other woven material to allow required sunlight, moisture and air to pass through the gaps. It creates an appropriate micro climate conducive to the plant growth. It is also referred as shade net house or net house.Uses of net house are as follows-
  • Helps in cultivation of flower plants, foliage plants, medicinal plants, vegetables and spices.
  • Used for fruit and vegetable nurseries as well as for raising of forest species etc.
  • Helps in quality drying of various agro products.
  • Used to protect against pest attack.
  • Protects from natural weather disturbances such as wind, rain, hail and frost.
  • Used in production of graft saplings and reducing its mortality during hot summer days.
So, the correct answers are both ' Insects & Strong wind'

Green house crops such as tomatoes and bell pepper produce higher yields. This is due to.

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. Tomatoes and bell pepper are not $C _3$ plants

  2. Due to diffused light in green house

  3. $CO _2$ is limiting factor to photosynthesis

  4. $CO _2$ enriched atmosphere leads to higher yield

Show answer
Correct Option: D
Explanation:
  • Growing crops in greenhouse produce higher yields due to a lot of reasons like - temperature control, carbon dioxide factor, reduced pest and disease exposure and humidity. 
  • The concentrated carbon dioxide results in larger leaves, stronger plant stems and possible early flowering and fruiting.
  • So the correct option is 'CO2 enriched atmosphere leads to higher yield'.

Rooftop gardening are mainly found in urban areas because

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. It absorbs heat radiated in the atmosphere.

  2. In urban areas, there is a shortage of space.

  3. It reduces rate of pollutants in the atmosphere.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

Roof gardening is a type of garden which is started on the roof of the building. It is an ideal way of urban gardening.  In urban areas, local and fresh food can be available due to this gardening. To make cities more efficient and to reduce pollution. It reduces heat buildup in cities in the summer season.

So, the correct option is 'All of the above'.

Which is wrong among the following?

evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

  1. Anabaena and Nostoc are capable of fixing nitrogen in free state.

  2. Root nodule forming nitrogen fixers live as aerobes under free living state.

  3. Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins.

  4. Nitrosomonas and Nitrobacter are chemoautotrophs.

Show answer
Correct Option: A