Horticulture - Study Mode
[#526] Rosette formation is due to the deficiency of
Correct Answer
(B) Zn
Explanation
Solution: Rosette formation is due to the deficiency of Zinc . A rosette formation characterized many small papery pointed tip leaves emerging from a reduced internodal distance. The other zinc deficiency symptoms are uniformly distributed interveinal chlorotic spots all along both sides of leaf margins, marginally small leaves with interveinal chlorotic spots and sharp pointed tip leaves with interveinal chlorosis with marginally reduced leaf size.
[#527] Fire blight of pear is caused by
Correct Answer
(B) Bacteria
Explanation
Solution: Fire blight of pear is caused by Bacteria . Fire blight is a common and very destructive bacterial disease of apples and pears. The disease is caused by the bacterium Erwinia amylovora , which can infect and cause severe damage to many plants. The disease can kill blossoms, fruit, shoots, twigs, branches and entire trees.
[#528] Harvesting of latex from opium capsules is called
Correct Answer
(B) Lancing
Explanation
Solution: Harvesting of latex from opium capsules is called Lancing . The lancing operation is performed by skilled labor (an average of 6 persons to a plot), usually on bright sunny days between noon and 4 p.m. The hottest part of the day is chosen, since the pellicle is said to form on the surface of the freshly exuded latex due to the hot sun, resulting in a greater degree of evaporation and quicker thickening. This also helps prevent the latex from falling off the capsule. The lancing operation is started at the edge of the field and the person works backward to avoid contact with the exuding latex.
[#529] Auxanometer is used to measure
Correct Answer
(D) Growth of the plant
Explanation
Solution: Auxanometer is the combination of two words i.e. ‘ Auxain ’ means to grow and ‘ metron ’ means to measure. Thus an auxanometer is an apparatus for measuring the increase of growth in plants. The "rate of growth" is a derived measurement obtained by dividing the length of growth measured by the auxanometer, by the time said measurement took. It is also called an arc indicator.
[#530] Chemical formula of potassium metabisulphite is
Correct Answer
(B) K 2 S 2 O 5
Explanation
Solution: Potassium metabisulphite is also known as potassium pyrosulphite, it is a white crystalline powder with the chemical formula K 2 S 2 O 5 . It can be prepared by treating a solution of potassium hydroxide with sulphur dioxide. It is mainly used as an antioxidant or chemical sterilant, a food additive