Alzheimer’s disease in human beings is characterized by the degeneration of _______
(A) Kidney cells
(B) Nerve cells
(C) Liver cells
(D) Spleen cells
Average salinity or ratio of salt as per kilogram of water of ocean is__________
(A) 35 grams
(B) 55 grams
(C) 32 grams
(D) 42 grams
Sum of all ecosystems is classified as___________
(A) Aero sphere
(B) Ionosphere
(C) Biosphere
(D) Ozonosphere
Ice mass that covers more than fifty_thousand square kilometers of land area is classified as____________
(A) ice sheet
(B) ice field
(C) glacier erosions
(D) ice cap
Evaporation from ice and snow is known as___________
(A) evaporation
(B) sublimation
(C) hydrogenation
(D) insolation
What is the name of the central part of the earth
(A) Mantle
(B) Core
(C) Crust
(D) None of the above
The rocks formed out of layers of sediment bonded together are known as _______________
(A) Metamorphic rocks
(B) Sedimentary rocks
(C) Igneous rocks
(D) All of the above
Hydrogen peroxide (H2O2)______________
(A) helps line up cell proteins
(B) is poisonous to tissues
(C) is often needed as a catalyst
(D) aids in oxidation of glucose