Question

All cultivated varieties of sugarcane are obtained by
A. Interspecific hybridisation
B. Intraspecific hybridisation
C. Mutation
D. Plant introduction

Answer 1

Hint:- Interspecific hybrids are bred by mating two species, normally from within an equivalent genus. The progeny shows the traits and characteristics of both parents. Progeny of an interspecific cross are fairly often sterile; thus, hybrid sterility prevents the movement of genes from one species to the opposite , keeping both species distinct.

Complete step-by-step solution:-Sugarcane or sugar cane ask several species and hybrids of tall perennial grass within the Saccharum , tribe Andropogoneae, that are used for sugar production. The plants are two to 6 metres (six to twenty feet) tall with stout, jointed, fibrous stalks that are rich in sucrose, which accumulates within the stalk internodes. Sugarcanes belong to the Gramineae , Poaceae, an economically important angiosperm family that has maize, wheat, rice, and sorghum, and lots of forage crops. It's native to the nice and cozy temperate to tropical regions of Southeast Asia and New Guinea .
Sugarcane is the world's largest crop by production quantity, with 1.8 billion tonnes[1] produced in 2017, with Brazil accounting for 40% of the planet total. In 2012, the Food and Agriculture Organization estimated it had been cultivated on about 26 million hectares (64 million acres), in addition to more than 90 countries.
So, the correct answer is option A.

Additional information- About 70% of the sugar produced globally comes from a species of sugarcane called sugarcane and hybrids of this species. All sugarcane species can interbreed, and therefore the major commercial cultivars are complex hybrids.
Sugarcane accounts for 79% of sugar produced; most of the remainder is formed from sugar beets.

Note:-
 Sucrose (table sugar), extracted from sugarcane in specialized mill factories, is either used as a staple within the food industry or fermented to supply ethanol. Products derived from sugarcane include falernum, molasses, rum, cachaça, and bagasse. In some regions, people use sugarcane reeds to form pens, mats, screens, and thatch. The young, unexpanded inflorescence of Saccharum edule (duruka) is eaten raw, steamed, or toasted, and ready in various ways in Southeast Asia , including Fiji and certain island communities of Indonesia.