Agronomy MCQ Question and Answer | Agriculture MCQ Question

Phalaris minor is a tufted annual bunchgrass up to 1.8 meters in height. It has a spike-like panicle. It is used as fodder or forage for livestock and birdseed. It is a potential contaminant of seed crops.
It is a common weed in the wheat crop. It can be controlled by controlled grazing, regular mowing and regular use of weedicide.

1. Dhurin Synthesis: Dhurin is a cyanogenic glycoside synthesized by sorghum plants under drought conditions.

2. Location of Synthesis: During drought stress, sorghum plants primarily synthesize Dhurin in their roots.

3. Purpose: Dhurin serves as a defense mechanism for the plant against herbivores and pests.

Therefore, the correct answer is Option A: Roots.

The scientific name of Napier grass is Cenchrus purpureus. It is also known as elephant grass or Uganda grass is a species of perennial tropical grass native to the African grasslands. It has low water and nutrient requirements also it improves soil fertility and protects against soil erosion.
Napier grass is propagated by planting slips or splits. About 800 - 1000 kg which is around 27,800 root slips or stem cuttings is required for planting one hectare of land with Napier grass.

Seed tuber rate refers to the amount of potato seed (in the form of tubers) required to plant one hectare of land.

1 quintal equals 100 kilograms, so this rate defines the total weight of seed tubers needed for proper planting.

The recommended seed rate for potatoes varies depending on variety, tuber size, spacing, and intended yield.

20–25 quintals per hectare is the most commonly recommended and agronomically efficient rate for standard varieties and average tuber size.

This rate ensures optimum plant population without seed wastage, promoting healthy growth and good yields.

Rates lower than this (like 5–15 quintals) may lead to poor stand and low yield, while higher rates (like 25–30 quintals) may be excessive and uneconomical unless used for very small tubers or specific conditions.

Therefore, the correct and widely recommended seed tuber rate is Option C: 20 – 25 quintals/hectare.

White jute is scientifically known as Corchorus capsularis. It is shrub species in the Malvaceae family. It is the main source of jute as its fibres are finer than normal jute.
Jute is a rainy season crop, it is sown in. March - April depending upon the rainfall and type of land, is harvested from June - September.

Lantana camara is a species of flowering plant within the verbena family, Verbenaceae. It is a very adaptable species, which can inhabit a wide variety of ecosystems.
It is a perennial. Erect sprawling or scandent, shrub which grows around 2 m tall and forms dense thickets in a variety of environments.

Foodgrains refer to any variety of grain or material that is grown for human consumption. It includes all cereals (Rice, wheat), pulses and coarse cereals.
Here coarse cereals refer to cereal grains other than wheat and rice or those used primarily for animal feed or brewing like sorghum, pearl millet, Ragi, Maize, Barley, etc.
The total production of foodgrains in India as per estimates for 2021 - 22 is around 316.06 million tonnes.

Urea is the most common fertilizer used to fulfill nitrogen requirements in sugarcane plants. Sugarcane is a heavy nitrogen user for the production of optimum yield and better quality.
For sugarcane, nitrogen fertilizer application has to be completed within 60 days after planting for better sugar content in the juice.

Tillering is a physiological process by which new aerial shoots emerge. And this phenomenon is regulated in some crops like maize, hence maize is referred to as non-tillering in nature. In maize crops, the underground branching of compact node joints of the primary shoot is regulated.

TPS stands for True Potato Seed, which refers to botanical seeds of potato rather than vegetative tubers.

HPS 1/113 is a well-known variety developed specifically for cultivation using True Potato Seeds.

This variety was released for commercial production due to its high yield potential, disease resistance, and adaptability for TPS-based cultivation.

Other options like JH 222, PJ 376, and Jr 5857 are not recognized TPS varieties and are generally used in tuber propagation.

Therefore, the correct answer is Option B: HPS 1/113.