Arabica and Robusta are the two varieties of _______.
A. Coffee
B. Ragi
C. Jowar
D. Tobacco

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Hint: Arabica and Robusta are superior in taste. Arabica has a smoother, sweeter taste than Robusta, which has a stronger, harsher taste with grainy or rubbery overtones.

Complete Answer:
Coffee is actually a part of a family of flowering plants called Rubiaceae. The coffee we drink mainly fall in these two species – Arabica and Robusta. Typica and Bourbon are the two varieties of Arabica. The flavor and characteristics of these beans differ. Every single type of bean or variety varies in quality and flavor. The growing conditions and process methods may also change the flavor of the coffee. Coffee grown in one location has a distinct set of characteristics when compared to the coffee grown in another location. More than $60\% $ of the world’s coffee production comes from Arabica cultivators according to the International Coffee Organisation. Usually, an Arabica shrub grows up to 15 feet (5 m) tall, and to make it commercially viable, it is usually pruned to about 6 feet (2 m). Arabica is capable of self-pollination as it has two sets of chromosomes. Robusta is widely used in espresso blends as it produces a better crema (the creamy layer) than Arabica. Robusta is more resistant to diseases and produces better yields. Robusta grows well even in the lower altitudes. Its size is about twice the Arabica and it grows well at higher humidity.

Thus, option (A) is correct.

Note: Arabica has a sweeter taste with flavor notes of chocolate and sugar while Robusta has a more bitter taste. This is because Robusta contains more caffeine as compared to Arabica.