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The correct answer is A.
The buggy pulls the horse backward just as hard as the horse pulls the buggy forward. Both of them would not move forward if surface is frictionless.
The correct answer is B.
In the given Venn diagram X, Y and Z represent vitamin D, vitamin E and vitamin K, respectively. Deficiency of vitamin A causes night blindness and deficiency of vitamin C causes scurvy. Pellagra is caused by deficiency of vitamin B3. Vitamin B is a group of several vitamins like B1, B2, B3, B6, B12 and folic acid and is known as vitamin B complex.
The correct answer is D.
X is oesophagus with no change in amount of undigested food. Y is stomach and Z is small intestine with decreasing amount of undigested food and P is large intestine as no further digestion occurs here.
The answer is C
The rate of contraction increases as osmolarity decreases because amount of water entering X by osmosis increases.
The correct answer is B
Microorganisms are used for the large scale production of alcohol, wine and acetic acid. Yeasts are mainly used in the commercial production of wine, beer and other alcoholic drinks. The main yeast species used is Saccharomyces cerevisiae. The process of conversion of sugar into alcohol is known as fermentation.
The correct answer is A
When a disease causing microbe (such as virus) enters body, some white blood cells produce chemicals called antibodies that surround the invader microbe. Once the virus has been surrounded by antibodies the white blood cell eats it.
