Agronomy

61.	Through Classical biological approach, weeds can be-
a.	Eradicated
b.	Controlled
c.	Maintained on an ecologically stable population
d.	Spreading can be checked Option “C” is correct. The biological way of controlling weeds involves using living organisms, such as insects, nematodes, bacteria, or fungi to reduce weed populations. The classical approach to controlling weeds is to maintain the fields with an ecologically stable population without harming crops.

62.	A place for keeping bees-
a.	Aviary
b.	Apiary
c.	Cage
d.	Nest Option “B” is correct. An Apiary is a location where beehives of honey bees are kept and reared for the production of honey on a commercial scale. It is an enclosed structure, made of wooden boxes with an opening that directs the flight path of the bees. An Aviary is a large enclosure for confining birds.

63.	Crop mixture have proved biologically most dynamic under-
a.	Irrigated conditions
b.	Large holding conditions
c.	Water stress condition
d.	High soil fertility conditions Option “C” is correct. Water stress is the condition when the water supply is limited to its roots, and the transpiration rate become intense. When plants are subjected to water stress it causes changes in stomatal response, ROS scavenging, metabolic changes, and photosynthesis. These collective responses lead to an adjustment in the growth rate of plants as an adaptive response for survival.

64.	Short day plants requires about how much light in a day for good flowering?
a.	8 h
b.	6 h
c.	10 h
d.	15 h Option “A” is correct. Plants are differentiated based on the requirement of direct sunlight, short-day plants flowers only when the day length is less and plants get approximately 8 hours of sunlight while the other one is long day plants that flower when the day length is more than twelve hours.

65.	The greenhouse effect is cause due to-
a.	Depletion of ozone layer
b.	Increase in CO₂ in the atmosphere
c.	Incoming UV rays on the Earth
d.	Absorption of outgoing long wave radiation Option “B” is correct. The greenhouse effect is the condition of the trapping of the sun’s infrared radiations which ultimately increases the temperature of the earth. Various gases are responsible for this effect like carbon dioxide, water vapour, nitrous oxide, methane, ozone, etc. the rise in the percentage of these gases because of pollution in the air lead to rising in the greenhouse effect.

66.	Sugarcane is planted furrow because-
a.	It reduce soil borne disease
b.	To avoid water losses
c.	It reduces lodging
d.	All of the above Option “C” is correct. Sugarcane is planted by three main methods, Flat planting, trench method, and furrow planting. In furrow planting, furrows are made with a sugarcane ridge about 10 – 15 cms deep and setts are planted end to end in the furrows and covered with 5 – 6 cms soil, leaving the upper portion furrows unfilled. This practice reduces lodging.

67.	Ethylene concentration for degreening is-
a.	10 ppm
b.	30 ppm
c.	20 ppm
d.	40 ppm Option “C” is correct. Degreening is the process of removing the green coloring from the skin of citrus fruit, with the motive to show it as ripe. This is achieved by adding a measured amount of ethylene gas in a temperature and humidity controlled environment. It is approximately 20 ppm.

68.	India tops the world in the production of-
a.	Fruits
b.	Vegetables
c.	Wheat
d.	Pulses Option “D” is correct. India is the world’s largest producer of milk, pulses and jute and ranks as the second largest producer of rice, wheat, sugarcane, groundnut, vegetables, fruit and cotton. Our country is also one of the leading producers of spices, fish, poultry, livestock and plantation crops.

69.	Which growth stage of sugarcane is critical for irrigation-
a.	Germination
b.	Grand growth phase
c.	Formative stage
d.	Ripening stage Option “C” is correct. Critical stages of irrigation of sugarcane are the stage which is affected severely because of water stress, these stages are sprouting, formative stage, ripening, and initiation of sprouts. But the most critical stage is the formative stage which is tillering stage.

70.	Food corporation of India was established in the year?
a.	1968
b.	1965
c.	1969
d.	1960 Option “B” is correct. FCI i.e. Food Corporation of India is a statuary body created and run by the Government of India, it was established on 14^th January 1965 and is headquartered in New Delhi. It maintains a satisfactory level of operational and buffer stocks of food grains to ensure National Food Security. It also regulates market price to provide food grains to consumers at a reliable price. It ensures the distribution of food grains throughout the country.

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