Question

Rainfall is absent but precipitation occurs in:
(A) Arctic desert
(B) Tropical desert
(C) Chaparral
(D) Savannah

Answer 1

Hint: In order to answer such questions you should know what rainfall is and how it is different from precipitation. Precipitation is a broad category and includes many other things including rainfall as well. Different ecosystems have different levels of annual precipitation.

Complete step by step solution:
The 62,300 square mile Arctic is a frigid desert, yet when snow does fall, it typically never melts and remains to coat the ground year-round. It doesn't rain or snow very often here since the icy Arctic air can't contain much moisture, creating arid conditions. Every year, the arctic tundra receives between 15 and 25 cm (6 and 10 inches) of precipitation, which includes both rain and snowfall as well as melting snow and ice.
In tropical deserts, precipitation is erratic to say the least. Less than 250 mm of precipitation fall annually on average in low latitude deserts. Only 10 to 30 percent relative humidity is present in interior regions, and dew points are often quite low, frequently well below the freezing point.
Chaparral is known for being extremely hot and dry. The average low temperature in the winter is 50°F (10°C). In this biome, winter is when it rains the most. Up to 100°F (37.5°C) and arid conditions characterize the summer.
The seasonal rainfall, which predominates for three to five months in the summer, is the most distinguishing characteristic of the savanna regions. According to climatic statistics, almost all savannas are located in areas with 81 cm of annual rainfall and average yearly temperatures between 15 and 25 degrees Celsius.
In the arctic desert, precipitation does not fall but there is no rain. When it rains, it snows. Winter is when there is only snow-based precipitation. There is hardly any precipitation.
So, option (A) is correct.

Note:
Please note that the main difference between rainfall and precipitation is that the rainfall is in liquid water form which falls due to condensation of water vapour. Precipitation also includes drizzle, snow, sleet, hail, etc.