Agronomy

21.Pollen viability of wheat is related to supply of-
a.Zinc
b.Molybdenum
c.Boron
d.Potash

Option “C” is correct.
Pollen viability refers to its functionality which is the ability of pollen to mature, germinate and transfer the male gametes to the embryo sac. Wheat pollen loses germination ability rapidly when stored at room temperature in both dry airs as well as humid air. Thus, boron is the plant nutrient responsible for pollen viability in wheat.
22.Water harvesting is defined as-
a.
b.
c.
d.

Option “D” is correct.
Water harvesting is rainwater harvesting and is an ancient technique to be used to collect the rainwater through excess runoff on the farm in ponds, or in underground storage tanks to use later for agricultural or domestic purposes.
23.Which one of the following types of resistance is present in a crop variety showing high degree of resistance to a pathogen but becoming susceptible to it after large scale cultivation for 4 to 5 years or so-
a.
b.Horizontal resistance
c.Durable resistance
d.

Option “A” is correct.
Resistance to plant disease is either Vertical i.e. Specific or Horizontal i.e. Nonspecific. A plant variety that exhibits a high degree of resistance to a single race or strain, of a pathogen is said to be vertically resistant. This is usually controlled by a single plant gene but after large-scale cultivation, for 4 – 5 years it becomes susceptible to it.
24.Dwarf Wheat (Mexican) is introduced in India by-
a.
b.
c.
d.

Option “A” is correct.
Triple dwarf Mexican wheat varieties were developed by N. E. Borlaug in 1970 and were introduced as a major revolution in food security called Green Revolution. The varieties that were introduced in India were Sonora-64 and Lerma 64.
25.Cotton required a daily minimum temperature for germination is-
a.
b.
c.
d.

Option “C” is correct.
Every crop requires a daily minimum temperature for proper germination and cotton requires 16°C, but growth will be slow at this temperature. 21°C – 27°C is required for vegetative growth and 27°C – 32°C during the fruiting period.
26.Toxic alkaloid present in Sorghum is-
a.Cannabinol
b.Caffeine
c.Dhurrin
d.Capsaicin

Option “C” is correct.
Sorghum contains hydrocyanic acid and toxic alkaloid dhurrin and dihydroergosine. Dhurrin is a cyanogenic glycoside produced in many plants. It is discovered in multiple varieties of sorghum as the culprit of cattle poisoning by alkaloids.
27.IPM stands for-
a.
b.
c.
d.

Option “B” is correct.
IPM Is Integrated Pest Management. It is a sustainable, science base, decision making process that combines biological, cultural, physical and chemical tools to identify, manage and reduce risk from pests in a certain way that minimizes overall economic, health, and environmental risks.
28.Which is the leading state in production of groundnut?
a.UP
b.Delhi
c.Haryana
d.Gujarat

Option “D” is correct.
The leading state in the production of groundnut in Gujarat, accounting for 40% of total groundnut production in the country. Rajasthan, Tamil Nadu, Andhra Pradesh, Karnataka, Madhya Pradesh and West Bengal are also the producer of groundnut and add their parts to the total production of groundnut in the country.
29.‘Cajanus cajan L’ is a scientific name of-
a.
b.Lentil
c.
d.

Option “A” is correct.
Cajanus cajan L is the scientific name of legume pigeon pea, also called arhar or tur dal in the common language. It belongs to the legume family i.e. Fabaceae. It is consumed on large scale in South Asia and is a major source of protein for the population of the Indian subcontinent.
30.Sea island cotton belong to-
a.
b.
c.
d.

Option “D” is correct.
Sea island cotton is the variety of cotton belonging to Gossypium barbadense. It is a tropical, frost-sensitive perennial species that produces yellow-colored flowers and has black seeds. Other names associated with this species include sea island, Egyptian, Pima and extra-long-staple cotton.
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