Horticulture - Study Mode

[#616] Salt resistant tomato species is
Correct Answer

(D) Solanum cheesmaniae

Explanation

Solution: Salt-resistant tomato species is Solanum cheesmaniae. A salt-tolerant plant that grows in soil or waters of high salinity, coming into contact with saline water through its roots or by salt sprays, such as in saline semi-deserts, mangrove swamps, marshes and sloughs and seashores. Tomato is moderately tolerant to salinity by regulating water and ionic homeostasis according to Martinez-Rodriguez et al. High salinity adversely affects seed germination and inhibit growth and fruit development in tomato. Solanum cheesmaniae, is one of two main species of wild tomatoes found on the Galápagos Islands. It is a robust, perennial, herbaceous plant that at first grows erect, later lying. It is often found in rocky coastal sites and has habits of growing on the shore or inland.

[#617] A disease having regular occurrence in a particular area is termed as
Correct Answer

(A) Endemic

Explanation

Solution: A disease having regular occurrence in a particular area is termed Endemic. The word Endemic is used to describe a disease that is present at an approximately constant level within a society or country. For an infection that relies on person-to-person transmission, to be endemic, each person who becomes infected with the disease must pass it on to one other person on average.

[#618] Self incompatibility in cole crops is overcome by
Correct Answer

(D) All of the above

Explanation

Solution: Self-incompatibility in cole crops is overcome by Bud Pollination, CO2 Treatment and NaCl spray . Self-incompatibility is a widespread mechanism in flowering plants that prevents inbreeding and promotes outcrossing. Bud Pollination is the most successful method in both the gametophytic and sporophytic systems. The most advantageous stage for the buds to overcome self-incompatibility is two to seven days before anthesis. To maintain inbred lines of the crop plant, a method in that high CO 2 gas is treated to the pistils to overcome the self-incompatibility. It had been shown that self-incompatibility could be overcome by NaCl in the self-incompatible Chinese cabbage.

[#619] The blue colour of flowers of Hydron macrophylla as opposed regular pink colour is associated with the presence of which element in soil?
Correct Answer

(B) Al

Explanation

Solution: The blue colour of flowers of Hydron macrophylla as opposed to the regular pink colour is associated with the presence of Aluminium (Al) element in soil. Hydrangea macrophylla is a species of flowering plant in the family Hydrangeaceae, native to Japan. It is a deciduous shrub growing to 2 m tall by 2.5 m broad with large heads of pink or blue flowers in summer and autumn. Colour variation in hydrangeas is due to the presence or absence of aluminum compounds in the flowers. If aluminum is present, the colour is blue. In general, more acidity makes hydrangeas turn blue, less acidity promotes pink. This is caused by a colour change of the flower pigments in the presence of aluminium ions which can be taken up into hyperaccumulating plants.

[#620] Which one of the following soil type is best for vegetable cultivation?
Correct Answer

(C) Sandy-loam

Explanation

Solution: Sandy-loam is the soil type that is best for vegetable cultivation. Sandy loam soil is ideal for gardening, growing crops and producing great-looking lawns, especially in areas that are high in clay content. It is considered to be ideal because of its ability to release nutrients freely to plants, retain water to feed plants and allow excess water to flow away quickly and easily.