Agronomy - Study Mode

[#426] The process of formation of nitrogen and nitrous oxide gases from ammonical fertilizers in soil is known as
Correct Answer

(C) Denitrification

Explanation

Solution: The process of formation of nitrogen and nitrous oxide gases from ammonical fertilizers in the soil is known as Denitrification . It is a microbially facilitated process where nitrate is reduced and ultimately produces molecular nitrogen through a series of intermediate gaseous nitrogen oxide products.

[#427] Canola is a group of plants belongs to
Correct Answer

(A) Mustard

Explanation

Solution: Canola is a variety of rapeseed, which is a part of the mustard family i.e. Brassicaceae (Cruciferae). Canola oil is low in erucic acid, as opposed to colza oil. There are both edible and industrial forms produced from the seed of any of several cultivars of the plant family Brassicaceae.

[#428] The optimum seed rate for sunflower is (kg/ha)
Correct Answer

(A) 8 - 10

Explanation

Solution: The sunflower scientifically known as Helianthus annus is the crop grown for its edible oil and seeds.
In 2020, world production of sunflower seeds was 50 million tons, led by Russia and Ukraine with 53% combined of total production. The optimum seed rate for sunflower is 8 - 10 kg/ha.

[#429] Serious insect pest of arhar is
Correct Answer

(D) All of these

Explanation

Solution: Arhar also known as Pigeon pea or red gram, is a very old crop in our country. It is a leguminous crop, highly proteinaceous. Plume moth, Mod borer, and Leaf hopper are the serious insect pest of arhar. A plume moth is a brown-colored moth with fringed or plume like wings. Pod borer is the important insect pest of chick pea and it damages crop yield loss. A leafhopper is the minute insects are plant feeders that suck plant sap from grass, shrub and trees.

[#430] Which one is not realistic?
Correct Answer

(A) RGR = 5 g/g/day

Explanation

Solution: Let's break down this question about plant growth measurements! First, what do these abbreviations mean? * RGR: Relative Growth Rate - How much a plant grows per unit of existing plant material per day. * CGR: Crop Growth Rate - How much a plant community (like a field of crops) grows per unit area per day. * LAI: Leaf Area Index - The total leaf area per unit ground area. * LAR: Leaf Area Ratio - The leaf area per unit of total plant dry weight. Now, let's consider realistic values: * RGR = 5 g/g/day: This would mean a plant *doubles* its size *five times* each day! This is incredibly fast and not generally possible for most plants. So, it is not a realistic value. * CGR = 5 g/m 2 /day: A crop growing 5 grams of biomass per square meter each day is quite reasonable and achievable, depending on the crop and growing conditions. * LAI = 5: An LAI of 5 means there are 5 square meters of leaves for every square meter of ground. This is a common and realistic value for many crops at their peak growth. * LAR = 5 cm 2 /g: This indicates that for every gram of plant material, there are 5 square centimeters of leaf area. This value is realistic and falls within the normal range for plants. Therefore, the answer is A: RGR = 5 g/g/day, because it represents an unrealistically high growth rate.