16: Assertion (A) :
In Australia, cattle rearing is done more for meat than for milk.
Reason (R) :
Australians are traditionally non-vegetarians.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Explanation:
Both A and R are correct. But R is not the correct reason for A. Though they are traditionally non-vegetarian, they rear cattle for meat, for exporting.
17: Estuaries possess distinct blooms of excessive growth of a pigmented dinoflagellates. These blooms are called
(a) red tides
(b) sea tides
(c) black tides
(d) sea flowers
Explanation:
The growth of pigmented dianoflagellates causes red colour to water. So these blooms are called Red tides.
18: If you travel through the Himalayas, you are likely to see which of the following plants naturally growing there?
1. Oak
2. Rhododendron
3. Sandalwood
Select the correct answer using the code given below.
(a) 1 and 2 only
(b) 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
19: There is a concern over the increase in harmful algal blooms in the seawaters of India. What could be the causative factors for this phenomenon?
1. Discharge of nutrients from the estuaries.
2. Run-off from the land during the monsoon.
3. Upwelling in the seas.
Select the Correct answer from the codes given below:
(a) 1 only
(b) 1 and 2 only
(c) 2 and 3 only
(d) 1, 2 and 3
Explanation:
Harmful algal blooms (HAB), lethal for human beings and marine ecosystems alike, are steadily increasing in intensity in the Indian waters.
Causative factors : Upwelling, formation of mud banks, nutrient discharged from estuaries and run-off from the land during southwest and northeast monsoons cause some algae blooms in coastal waters.
The changing pattern of nutrient ratio of the coastal and the open ocean waters due to anthropogenic activities, increased aquaculture operations leading to enrichment of coastal water, dispersal of toxic species through currents, storms, ship ballast waters and shell fish seeding activities were some of the factors triggering the blooms
20: Huangpu River flows through which one of the following cities?
(a) Beijing
(b) Shanghai
(c) Ho Chi Minh City
(d) Manila
Explanation:
Huangpu river flows through Shanghai city, is the most important Shipping artery from the mouth of the Yangtzekiang river in Wusong to the East China sea. Huangpu river is a tributary of Yangtzekiang river (3rd longest river in the world after Nile and Amazon).