Horticulture - Study Mode

[#346] Bolting problem in onion occur when temperature goes below
Correct Answer

(D) 10°C

Explanation

Solution: Bolting problems in onions occur when the temperature goes below 10°C . The term bolting in onion means pre-emergence of seed stalks before the time of their formation at the cast of bulb formation and development. Bolting is an undesirable character because it directly affects the bulb yield of onion. Rabi onion starts to bolt at 20 - 25°C temperature. Early transplanting (August) and late (end of December-January) induce bolting in Kharif and Rabi onion, respectively. The restricted or poor vegetative growth also leads to bolting. It can be controlled by adjusting the time of transplanting in such a way that the crop may expose to a moderate temperature at bulbing. The maturity of the Rabi crop coincides with high temperature compared to the Kharif crop.

[#347] Sree Dhara is a variety of
Correct Answer

(D) Chinese potato

Explanation

Solution: Sree Dhara is a variety of Chinese potatoes . 'Sree Dhara' was developed by the CTRI, in Sreekaryam in Thiruvananthapuram. It is a high-yield Coleus variety with good cooking quality. It is the first variety of Chinese potatoes. The maturity duration is 5 months and the average yield is 25 - 28 T/Ha. It is a good variety of Chinese potatoes. The starch content of the tubers is 19.5 %. Bushy compact plant type. It bears a cluster of dark brownish, heteromorphous tubers. The tubers possess an aromatic flavour. Used mainly as a vegetable.

[#348] 1 st Hybrid tea rose variety developed was
Correct Answer

(A) La France

Explanation

Solution: 1 st Hybrid tea rose variety developed was La France . 'La France' is a pink rose found in France in 1867 by the rosarian Jean-Baptiste André Guillot (1827 - 1893). It is generally accepted to be the first hybrid tea rose. Hybrid tea is an informal horticultural classification for a group of garden roses. Hybrid tea flowers are well-formed with large, high-centered buds, supported by long, straight and upright stems. Each flower can grow to 8 - 12.5 cm wide. Hybrid teas are the largest and most popular group of roses, due to their elegant form and the large variety of colours.

[#349] The nutrient involved in oil-biosynthesis is
Correct Answer

(D) Sulphur

Explanation

Solution: The nutrient involved in oil-biosynthesis is Sulphur . Oil crops respond to the application of sulphur, moreover, the sulphur requirement is the highest in oil crops in comparison with other crops, which is related to the role of this nutrient in oil biosynthesis. Sulphur is a component of plant amino acids, proteins, vitamins and enzyme structures. Sulphur is essential for many growth functions in plants including nitrogen metabolism, enzyme activity, and protein and oil synthesis.

[#350] Sweet potato belongs to family
Correct Answer

(B) Convolvulaceae

Explanation

Solution: Sweet potato belongs to the family Convolvulaceae. The sweet potato or sweet potato ( Ipomoea batatas ) is a dicotyledonous plant that belongs to the bindweed or morning glory family, Convolvulaceae. Sweet potato is native to the tropical regions of the Americas. Of the approximately 50 genera and more than 1,000 species of Convolvulaceae, I. batatas are the only crop plant of major importance some others are used locally, but many are poisonous. Its large, starchy, sweet-tasting tuberous roots are used as a root vegetable.