Horticulture - Study Mode

[#226] Which of the following plant hormone is most effective in induction of bolting in rosette plant?
Correct Answer

(B) GA3

Explanation

Solution: GA3 (Gibberellic acid) is the plant hormone that is most effective in the induction of bolting in rosette plants. In the case of the rosette plants, there is sudden and excessive internodal growth which is followed by flowering on the application of gibberellins is called bolting. There is an increase in the internodal distance which results in the elongation of the stem.

[#227] CIMAP Trishna and CIMAP Tripta are varieties of
Correct Answer

(A) Palmarosa

Explanation

Solution: CIMAP Trishna and CIMAP Tripta are varieties of Palmarosa. It is best known by the common name palmarosa ( palm rose ) as it smells sweet and rose-like. Other common names include Indian geranium, ginger grass, rosha and rosha grass. A high-yielding synthetic variety TRISHNA was developed by poly cross progenies of four elite inbred by CIMAP Lucknow. This improved cultivar registers 40% more oil yield and its geraniol content is as high as 93%. CIMAP Tripta has major constituents like Citral, Geranyl acetate, Linalool and Geraniol at 94%.

[#228] Hybrid tea roses are a cross of
Correct Answer

(D) Hybrid perpetual × Tea roses

Explanation

Solution: Hybrid tea roses are a cross of Hybrid perpetual × Tea roses. Hybrid tea roses, are the oldest class of modern garden roses, the products of a cross between hybrid perpetual roses and old-fashioned tea roses, are rose royalty. They are the most popular roses in the world and perhaps the most popular flowers. Hybrid teas have a high-centered bloom form and are carried singly or with several side buds.

[#229] Choose annual crucifer
Correct Answer

(D) All of the above

Explanation

Solution: Annual crucifers are heading Chinese cabbage, non-heading Chinese cabbage and radish. Brassicaceae , formerly Cruciferae , is the mustard family of flowering plants (order Brassicales), composed of 338 genera and some 3,700 species. And annual refers to being grown all over the year. The family includes many plants of economic importance that have been extensively altered and domesticated by humans, especially those of the genus Brassica , which includes cabbage, broccoli, Brussels sprouts, kale, kohlrabi, napa cabbage, turnip, rutabaga, etc.

[#230] Cause of sleepiness in carnation is
Correct Answer

(C) Ethylene

Explanation

Solution: The cause of sleepiness in carnation is Ethylene . The term "sleepiness" as applied to flowers is usually confined to carnations. It is characterized by partial closing of the flower due to an incurving or curling of the petals. They have ethylene-sensitive floral organs and show characteristic senescence patterns, including petal in rolling, which coincides with the climacteric increase in ethylene biosynthesis.