1841. The dramatic increase in agricultural production that have been made possible by high yield miracle crops are called the

A. biotechnical revolution
B. bioeconomic revolution
C. green house effect
D. green revolution
✅ The correct answer is option D.
The dramatic increase in agricultural production that have been made possible by high yield miracle crops are called the green revolution.

1842. Definition of ecosystem is

A. The community of organisms together with the environment in which they live
B. The abiotic component of a habitat
C. The part of the earth and its atmosphere which inhibits living organisms
D. A community of organisms interacting with one another
✅ The correct answer is option A.
A biological community of interacting organisms and their physical environment.

1845. During an equinox:

A. The days and nights are of equal length except at the poles
B. At noon the sun is overhead at the equator
C. The earth is not tilted toward nor away from the sun
D. All of the above
✅ The correct answer is option D.
Although there’s nothing official about it, many say the March or vernal equinox signals the start of spring in the Northern Hemisphere and autumn in the Southern Hemisphere. The equinox is a hallmark of the seasons. At this equinox, the sun crosses the celestial equator, moving from south to north. The March 2020 equinox falls on March 20 at 03:50 UTC. That’s March 19 at 10:50 p.m. Central Daylight Time for us in North America; translate to your time zone.

1846. During a radiation inversion, wind machines

A. Bring warm air down toward the surface
B. Lift cool, surface air to higher altitudes
C. Mix the air near the ground
D. All of the above
✅ The correct answer is option D.
During a radiation inversion, wind machines bring warm air down toward the surface, lift cool, surface air to higher altitudes and mix the air near the ground.

1848. _______ tree is known as “flame of the forest”?

A. Zizyphus
B. Butea monosperma
C. Jackfruit
D. Pongamea
✅ The correct answer is option B.
Butea monosperma is a species of Butea native to tropical and sub-tropical parts of the Indian Subcontinent and Southeast Asia, ranging across India, Bangladesh, Nepal, Sri Lanka, Myanmar, Thailand, Laos, Cambodia, Vietnam, Malaysia, and western Indonesia. Common names include flame-of-the-forest and bastard teak.

1849. What is meant by root zone process?

A. A control measure to prevent water pollution
B. A process by which roots of plants are spread on the ground
C. A control measure to prevent soil pollution
D. None of these
✅ The correct answer is option C.
A process by which roots of plants are spread on the ground. A control measure to prevent soil pollution.