Environmental Science
During the winter solstice in the Northern Hemisphere:

Astronomical winter begins in the Northern Hemisphere
The noon sun is overhead at 23.5o S latitude
All of these
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year

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Environmental Science
An important reason for the large daily temperature range over deserts is:

Dry air is a very poor heat conductor
Free convection cells are unable to form above the hot desert ground
There is little water vapor in the air to absorb and re-radiate infrared radiation
The light-colored sand radiates heat very rapidly at night
The ozone content of desert air is very low

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Environmental Science
Which among the following is related to the word Mesoderm ?

Binomial system of classification
Forms blood and bone (leads to complex internal organs)
No membrane-bound organelles, no peptidoglycan in cell walls, introns
Anatomically advanced animals having all three germ layers

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