Horticulture MCQ Question and Answer | Agriculture MCQ Question

The freezing tolerant rootstock of citrus is C. unishu.
Citrus unshiu is a semi-seedless and easy-peeling citrus species, also known as cold hardy mandarin and tangerine.
These are cold-hardy and when planted in colder locations, the fruit becomes sweeter from the colder temperatures. A mature satsuma tree can survive down to -9°C (15°F) or even -11°C (12°F) for a few hours.
It is usually seedless, but it can be grown from seed, which takes about eight years until the first fruits are produced or grafted onto other citrus rootstocks, such as trifoliate orange.

Bitter gourd witches broom is caused by Virus.
Witches' broom is a deformity in a woody plant, typically a tree, where the natural structure of the plant is changed. A dense mass of shoots grows from a single point, with the resulting structure resembling a broom or a bird's nest. It is sometimes caused by pathogens.
The normal hierarchy of buds is interrupted, and apices grow indiscriminately. This can be caused by cytokinin, a phytohormone that interferes with growth regulation.

Many fold effects of a gene are referred to as Pleiotropy.
“Pleiotropy” refers to the phenomenon in which a single locus affects two or more unrelated phenotypic traits and is often identified as a single mutation that affects two or more wild-type traits.
It refers to the effect that mutations in the same gene may lead to multiple, seemingly unrelated diseases. One gene controls the expression of several phenotypic traits. Phenotypes are traits that are physically expressed such as color, body shape and height.

CBD (Convention on Biological Diversity) was signed during the Earth Summit in Rio de Janeiro, Brazil in 1992.
The Convention on Biological Diversity (CBD), is a multilateral treaty. The Convention has three main goals: the conservation of biological diversity, the sustainable use of its components; and the fair and equitable sharing of benefits arising from genetic resources.
Its objective is to develop national strategies for the conservation and sustainable use of biological diversity.

The seed plot technique in potatoes was developed by Dr. Puskarnath in 1967.
"Seed Plot Technique" i.e. raising the healthy seed crop during the low aphid population period available in northern plains.
It is a technique of multiplication of disease-free (virus-free) seeds in the Northern plains of the country. The nucleus seed of the potato is produced from April to August when the aphid population is low in the hills.

The inception of ripening in grape is termed Verasion.
It is the onset of the ripening of the grapes. The official definition of veraison is "change of colour of the grape berries".
The trigger of veraison is unknown but may signify the seed reaching maturity, an unlikely signal, however, because seedless berries also proceed through veraison.

Haploid plants have been produced by anther culture in tomato by Greshof and Doy.
Experimental induction of androgenesis from cultured anthers was first attempted in tomatoes by Gresshoff and Doy, in 1972 soon after the discovery of the process by Guha and Maheshwari (1964).
Anther culture means plant regeneration from the haploid microspore cells with the aim of haploid and dihaploid plant production.

The fruit thinning growth regulator is NAA.
NAA (naphthalene acetic acid) is a synthetic auxin plant growth regulator that will effectively promote return bloom when used at the thinning stage in trees that are biennial bearing. It is widely used as an effective thinner in apple orchards. When applied shortly after fruit set, some fruit abscise leading to improved fruit size and quality.

In India, hydroponics was 1^st introduced at Kalimpong.
The first work on soilless culture in India was started in 1946 at the Government of Bengal's Experimental Farm at Kalimpong.
Hydroponics is a type of horticulture and a subset of hydroculture that involves growing plants, without soil, by using water-based mineral nutrient solutions in aqueous solvents.
In 1929, William Frederick Gericke of the University of California at Berkeley began publicly promoting that the principles of solution culture are used for agriculture and He first termed this cultivation method "aquiculture".

Rock arrangement is a central feature of a Japanese garden.
These are traditional gardens whose designs are accompanied by Japanese aesthetics and philosophical ideas, avoid artificial ornamentation and highlight the natural landscape.
Japanese gardens are characterized by, the waterfall, of which there are ten or more different arrangements; the spring and stream to which it gives rise; the lake; hills, built up from earth excavated from the basin for the lake; islands; bridges of many varieties; and the natural guardian stones. In Japanese landscaping, rocks are classified as either tall vertical, low vertical, arching, reclining or flat.