Q. How many statement/s are true?
A. Temperature is the most relevant ecologically environmental factor. It ranges from subzero levels in polar areas and high altitudes to >50°C in tropical deserts in summer.
B. A few organisms can tolerate and thrive in a wide range of temperatures, they are called eurythermal.
C. The productivity and distribution of plants are also heavily dependent on water.
D. In the aquatic environment, the sediment characteristics often determine the type of benthic animals that can thrive there.

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Solution:

Temperature is the most ecologically relevant environmental factors. Average temperature on land varies seasonally, and progressively decreases from the equator to poles. Organism which can survive in wide range of temperature are called as eurythermals. The productivity and distribution of plants is also heavily dependent on water.