Agronomy - Study Mode

[#466] 1$$mathop { ext{A}}limits^{ ext{o}} $$ (Angstrom ) is equal to
Correct Answer

(D) 10 -9 cm

Explanation

Solution: Angstrom is the unit of length, equal to 10 -9 cm, 10 -10 Meter, or 0.1 nanometers. In words, that is one ten-billionth of a meter, a hundred millionth of a centimeter. Its symbol is $$mathop { ext{A}}limits^{ ext{o}} $$, a letter of the Swedish alphabet. It is named after the Swedish physicist Anders Jonas Angstrom. It is often used in science and technology to express the size of atoms, molecules, microscopic biological structures, lengths of chemical bonds, arrangement of atoms in crystals, etc.

[#467] Leading country in oil palm production is
Correct Answer

(C) Indonesia

Explanation

Solution: Palm oil is the edible oil derived from palm fruit. It is widely used in the food manufacturing industry, beauty product industry as well as biofuel. Indonesia is the leading producer of palm oil in the world, it produces about 4,55,00,000 metric tons followed by Malaysia and Thailand respectively.

[#468] pH change from 9 to 6, the H ion concentration will
Correct Answer

(B) Increase by 1,000 times

Explanation

Solution: pH is changing from 9 to 6 means moving from basicity to acidity level. Therefore, the concentration of H + ion will increase 1,000 times. The H + concentration of pH 9 is 10 -9 mol/l while that of pH 6, the H + ions will be 10 -6 , hence increase of 10 -3 hydrogen ions i.e. 1,000 ions can be observed.

[#469] Tilth is related to
Correct Answer

(D) All of these

Explanation

Solution: Tilth of soil is a dynamic and multifaceted concept that refers to the suitability of soil for planting and growing crops. It is related to the shape of the soil aggregates, the size distribution of the soil aggregates, and the arrangement of the soil aggregates.

[#470] In a cropping sequence of maize-wheat-moong the cropping intensity should be
Correct Answer

(C) 300%

Explanation

Solution: Cropping intensity is the number of times a crop is planted per year in a given agricultural area. Cropping intensity $$ = frac{{{ ext{Gross cropped area}}}}{{{ ext{Net sown area}}}} imes { ext{100}}$$ xa0 xa0xa0 $$ = frac{3}{1} imes 100 = 300$$ In a cropping sequence of maize-wheat-moong, the cropping intensity should be 300%.