Exercise 9

Question 11 :

The variation in the duration of the day and the night is due to earth's

A). rotation on its axis
B). revolution around the sun
C). inclination of an angle of 60(1/2) degrees
D). both (a) and (b)
Answer : Option D

Question 12 :

The sulphites are a mineral group that contain one or more metallic elements in combination with the sulphate compound ____

A). SO3
B). SO2
C). SO4
D). SO
Answer : Option C

Question 13 :

The term 'flora' in the context of natural vegetation refers to

A). assemblage of plant species living in association with each other in a given environmental frame
B). plants of a particular region or period, listed by species and considered as a group
C). a large tract covered by trees and shrubs and its administration for assessing economic benefits
D). role played by species of animals in the maintenance of ecological balance
Answer : Option B

Question 14 :

Which of the following is concerned with the study of characteristics, origin and development of land forms?

A). Ecology
B). Geography
C). Geology
D). Geomorphology
Answer : Option D

Question 15 :

The soils common to the south eastern USA are called

A). ultisols
B). alfisols
C). aridsols
D). mollisols
Answer : Option A