Option “3” is correct French biologist Lamarck is best known for his “Theory of Inheritance of Acquired Characters”, first presented in 1801. He was the first person to explain the theory of evolution to the public. In 1809, this theory was published in his book ‘Philosphie Zoologique’.
522. Enzymes are basically-
1. Fats
2. Sugars
3. Proteins
4. Vitamins
Option “3” is correct Enzymes are biological molecules (proteins) that act as biocatalysts and help complex reactions occur everywhere in life. These are basically proteins and perform chemical transformations on organic compounds.
523. Oxygen, which is liberated during photosynthesis, comes from-
1. Water
2. Nitrogen
3. Chlorophyll
4. Phosphoglyceric acid
Option “1” is correct Oxygen gas produced by photosynthesis comes from water.
524. Which of the following vitamins contain cobalt?
Option “4” is correct A lactobacillus bacterium causes milk to spoil.
526. Which is the only mammal that can fly?
1. Whale
2. Bat
3. Hen
4. Lizard
Option “2” is correct Bat is the mammal that can fly.
527. The normal body temperature of human beings is –
1. 96.4° F
2. 97.4° F
3. 98.6° F
4. 99.4° F
Option “3” is correct 98.6° F is the normal body temperature of human being.
528. Who discovered the polio vaccine?
1. Louis Pasture
2. Konard Zuse
3. Eli Whitney
4. Jonas Salk
Option “4” is correct Jonas Edward Salk discovered polio vaccine.
529. Birds which swim in water have –
1. Webbed feet
2. Broad wings
3. Long beaks
4. Toes with claws
Option “1” is correct The primary use for webbed feet is paddling through water, as the bird pulls its foot backwards through the water, the toes spread apart, causing the webs to spread out and help bird to swim.
530. The Saliva helps in the digestion of –
1. Proteins
2. Starch
3. Fibers
4. Fats
Option “2” is correct Saliva contains the enzyme amylase, also called ptyalin, which is capable of breaking down starch into simpler sugars such as maltose and dextrin that can be further broken down in the small intestine.
