Horticulture - Study Mode
[#986] Largest Annona fruit is borne by
Correct Answer
(B) Annona muricata
Explanation
Solution: Largest Annona fruit is borne by Annona muricata . The Annona fruit belongs to Annonaceae, a family of flowering plants consisting of trees, shrubs, or rarely lianas commonly known as the custard apple family or soursop family. A. muricata, also known as soursop, Graviola and guanabana, is an evergreen plant that is mostly distributed in tropical and subtropical regions of the world. The fruits of A. muricata are extensively used to prepare syrups, candies, beverages, ice creams and shakes.
[#987] The precursor of ethylene synthesis in higher plants is
Correct Answer
(C) Methionine
Explanation
Solution: The precursor of ethylene synthesis in higher plants is Methionine . Ethylene is a plant hormone and is produced from essentially all parts of higher plants, including leaves, stems, roots, flowers, fruits, tubers and seeds. Plants synthesize ethylene using a two-step biochemical pathway starting from S-adenosyl-L-methionine (SAM). SAM is converted to 1-aminocyclopropane-1-carboxylic acid (ACC) by the enzyme ACC synthase (ACS). ACC is then converted to ethylene by the enzyme ACC oxidase (ACO). Thus Methionine can be called a precursor of this process.
[#988] Pink colour of onion is due to
Correct Answer
(B) Anthocyanin
Explanation
Solution: The pink colour of the onion is due to Anthocyanin which belongs to the class of flavonoids. Red onions contain anthocyanins in their epidermal cells, with the primary component of the 25 anthocyanins produced being cyanidin-3-O-glucoside, although a complex mixture of other cyanidin and peonidin derivatives are also present.
[#989] Stable form of papaya is
Correct Answer
(C) Pistillate
Explanation
Solution: Stable form of papaya is Pistillate . Papaya is a polygamous plant with three basic types of flowers viz. staminate, pistillate and hermaphrodite (bisexual). Of these, only pistillate is stable, whereas flowers of hermaphrodite and male vary in sex expression under different environmental conditions. The pistillate form of papaya has a flower that lacks stamens is pistillate. The pistillate flower of papaya is a pleurogynous unisexual form derived intraspecifically from a perigynous bisexual ancestor. It is a morphological anomaly in which the ovary consists of two cycles of carpels.
[#990] Which one of the following is a stem vegetable
Correct Answer
(C) Knol-khol
Explanation
Solution: Knol-Khol is a stem vegetable. As with edible tubers, roots and leaves, some vegetables are edible stems also. Knol-Khol and asparagus are among them. Radish is the root vegetable.
Sweet potato is a swollen adventitious root.