471. Which of the following is known as power house of Cell?
1. Golgi Body
2. Mitochondria
3. Nucleus
4. Reticulum
Option “2” is correct
Mitochondria is known as powerhouse of cell.
472. Wheat is a ______.
1. Creeper
2. Herb
3. Shrub
4. Tree
Option “2” is correct Wheat is a Herb and according to definition herb is a short plant with green, delicate stem. Generally, they have few branches or branchless. These can be easily uprooted from the soil.
473. Snakes, turtle, lizards and crocodiles falls under which category of animals?
1. Pisces
2. Amphibian
3. Reptilian
4. Aves
Option “3” is correct
Reptiles are tetrapod animals in the class Reptilia, comprising today’s turtles, crocodilians, snakes, amphibians, lizards, tuatara, and their extinct relatives. Reptiles are cold blooded animals.
474. With which of the following body organ is ‘pace-maker’ associated?
1. Liver
2. Brain
3. Heart
4. Lungs
Option “3” is correct A pacemaker is a small device that’s placed in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate.
475. Hemoglobin is an important component of _______.
1. White blood cells
2. Red blood cells
3. Plasma
4. All options are correct
Option “2” is correct Hemoglobin is the protein molecule in red blood cells that carries oxygen from the lungs to the body’s tissues and returns carbon dioxide from the tissues back to the lungs.
476. Vitamin ‘C’ help in absorption of which of following elements?
1. Iron
2. Calcium
3. Iodine
4. Sodium
Option “1” is correct Vitamin C is helpful in iron absorption whereas vitamin D helps in absorption of magnesium and calcium.
477. Fishes survive under the frozen lake, because-
1. Fishes have hot blood
2. Fishes are in hibernation under it
3. Water does not freeze near bottom
4. Ice is the conductor of heat.
Option “3” is correct Lakes and rivers are frozen when the outer temperature decreases below the freezing point in winter. But only the upper layer freezes in this condition. Water remains in liquid form below the upper layer. So fishes and other aquatic creatures can survive even in a frozen lake.
478. Yeast is an example of-
1. Bacteria
2. Fungus
3. Virus
4. Algae
Option “2” is correct Yeasts, molds and mushrooms are example of fungi.
479. Which of the following is a source of bio-fertilizer?
1. Yeast
2. Chlorella
3. Azolla
4. Mold
Option “3” is correct
Azolla has the capability of nitrogen-fixing. That is way it is being widely used as a bio-fertilizer, especially in parts of southeast Asia.
