Horticulture MCQ Question and Answer | Agriculture MCQ Question

Disease-free plants in micro-propagation can be obtained through meristem culture.
Meristem culture is a tissue culture technique that uses an apical meristem with 1 - 3 leaf primordia to prepare vegetative propagation clones of a plant.
The main aim of this culture is to obtain disease-free plants, and shoot tips of up to 10 mm are used. For rapid clonal propagation, a shoot-tip culture is followed in which (5 - 10 mm) explants are used. Hence, the majority of meristem cultures are essentially shoot-tip cultures.
It happens because its active cell division reduces the differentiation of vascular tissues.

The necrosis susceptible variety of Aonla is Francis.
Necrosis, a physiological disorder has been observed in aonla fruits. This particular disorder has been observed mostly in the case of Banarasi and Francis varieties. Fully developed brown-colored fruits are harvested. Delay in harvesting results in heavy dropping of fruits in case of some varieties.
This variety is physically erect and tall tree, good and regular bearer, Branches have the drooping habit. Large fruited weighing about 63 gms, oval roundish, light green, slightly fibrous, moderately juicy.

Protandry is a problem in Walnut.
Protandry is the condition in which the male reproductive organs (stamens) of a flower mature before the female ones (carpels), thereby ensuring that self-fertilization does not occur. It is a state in hermaphroditic systems that are characterized by the development of male organs or maturation of their products before the appearance of the corresponding female product thus inhibiting self-fertilization and that is encountered commonly in mints, legumes, carrots, walnut, etc.
In walnut, pollen is shed before the ovules are mature.

The fertilizer important for carrots is K (Potassium).
For Carrot plants, it is best to choose a fertilizer low in nitrogen and high in phosphate and potassium. 0-10-10 or 5-15-15 fertilizer will work well for the Carrot plant. It is because potassium and phosphate promote root growth in carrots, and these nutrients will help their better growth.

The Carnation variety tolerant to nematodes and fusarium wilt is Arka Flame.
It is an in vitro mutation selection from IIHRS-1, standard type carnation with a single flower on the straight stalk and produces flowers of red colour with smooth petal edges. Elongated flower buds open slowly and have good keeping quality. It yields 300 - 360 flowers.m² per year with a thick straight flower stalk. The most important characteristic of this variety is its tolerance to nematode and fusarium wilt.

Arka Vikas is a cultivar of tomato.
It is a pure line selection from American Variety Tip-Top. Fruits are medium-large (80 - 90 g), oblate with light green shoulder, which develop deep red on ripening. Bred for fresh market. Adapted to both rainfed and irrigated conditions. Its yield is 35 t/ha in 140 days.

The weed that causes Asthma is Parthenium.
Parthenium hysterophorus is a noxious weed in America, Asia, Africa and Australia. This weed is considered to be a cause of allergic respiratory problems, contact dermatitis, mutagenicity in human and livestock.
It is an annual herb with a deep taproot and an erect stem that becomes woody with age.

The Brinjal variety that is bicoloured is Vaishali.
The variety has a dwarf and spreading type of growth habit. Fruits are oval in shape purple in colour with white stripes. The stalks of the fruits bear spines. The crop is ready for first picking within 60 days after transplanting. The average yield is 30 t/ha.

The botanical name of cauliflower is Brassica oleracea var. botrytis.
Cauliflower, (Brassica oleracea, variety botrytis), a highly modified form of cabbage in the mustard family (Brassicaceae), is grown for its edible masses of partially developed flower structures and fleshy stalks.
The word cauliflower derives from the Latin words caulis (cabbage) and flōs (flower), reflecting its membership in the cabbage family.

In knol-rabi, the fleshy edible part is the enlargement of the stem.
Khol Rabi which is the german name for cabbage turnip resembles an above-ground turnip. It is also called knol-knol. The fleshy edible proration is an enlargement of the stem, which develops entirely above ground and is used as a vegetable.