Option “1” is correct. The epidermis, the outermost layer of skin, provides a waterproof barrier and creates our skin tone.
12. _______________ is the movement of molecules across a cell membrane from a region of their lower concentration to a region of their higher concentration.
1. Diffusion
2. Osmosis
3. Active Transport
4. Passive Transport
Option “3” is correct. Active transport is the movement of molecules across a membrane from a region of their lower concentration to a region of their higher concentration in the direction against the concentration gradient.
13. Study of classification of organisms is known as __________.
Option “1” is correct. Metformin is an oral antidiabetic drug for the treatment of diabetes.
15. Which of the following is a viral disease?
1. Polio
2. Tetanus
3. Leprosy
4. Plague
Option “1” is correct. Poliomyelitis is an acute communicable disease of humans caused by a human enterovirus of the Picornaviridae family.Tetanus is an infection caused by bacteria called Clostridium tetani. Leprosy is a disfiguring disease caused by the Mycobacterium leprae bacteria. Plague is caused by the bacteria Yersinia pestis.
16. Contraction of heart is also known as –
1. Systole
2. Aristotle
3. Diastole
4. Lub
Option “1” is correct. Diastole is that part of the cardiac cycle during which the heart refills with blood after the emptying done during systole which is also known as contraction.
17. Azadirachta indica is the botanical name of which of the following?
1. Rose plant
2. Apple tree
3. Neem
4. Mango
Option “3” is correct. Azadirachta indica is botanical name of neem. It is a multipurpose tree that is highly popular in India, where it provides food and insecticide, and is used for its great number of ethnomedicinal properties.
18. Which of the following is the main end product of carbohydrate digestion?
1. Fats
2. Lipids
3. Glucose
4. Cellulose
Option “3” is correct. End products of digestion of carbohydrates are Glucose, fructose and galactose.
19. Which of the following glands is a source of the enzyme Ptyalin?
Option “4” is correct. Salivary gland is a source of enzyme Ptyalin. The enzyme ptyalin, or salivary amylase acts on starches and converts them to maltose. It helps in the predigestion of starches.
20. Which of the following is responsible for transport of food and other substances in plants?
1. Xylem
2. Phloem
3. Chloroplast
4. None of these
Option “2” is correct. Phloem is responsible for transport of food and other substances in plants. Xylem transport water and solutes from the roots to the leaves.
