Author: Dr. Abu Bakkar Siddiq

Petroleum
coal
natural gas
Biogas

Answer-Biogas

They have many vents in their roots
Their stems are lighter than the leaves
They have many air holes in their trunks
None of them

Answer-They have many vents in their trunks

sun rays
Peat coal
Gasoline
natural gas

Answer-sun rays

Cooking requires not only heat but also pressure
The boiling point of a liquid increases at higher pressures
The stored steam heat helps in faster cooking
Heat is stored in closed containers

Answer-Boiling point of liquid increases at high pressure

Copper and tin
Copper and zinc
Copper and nickel
Copper and lead

Answer-Copper and zinc

guava
banana
papaya
Jamrul

Answer-Banana

Oxygen and glucose
Oxygen and blood nutrients
Urea and Glucose
Amino acids and carbon dioxide

Answer-Oxygen and Glucose

Iodine
iron
vitamins
calcium

Answer-Iron

the english
portuguese
french
dutch

Answer-Portuguese

Cancer line
Makarkranti Rekha
International Date Line

Answer- Cancer line