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Ecological competition is a potent force driving organic evolution. Indeed, such “character displacement” is one of several consequences of ecological competition.
Seeing the gradation and diversity of structure in one small, intimately related group of birds, one might really fancy that from an original paucity of birds in this archipelago, one species had been taken and modified for different ends. —Charles Darwin
Which part of brain causes nausea?
(c) Parietal lobe
Answer: (d) Medulla
Vomiting is the ejection of stomach contents through mouth.
This is the reflex action which is controlled by medulla.
A feeling of nausea preceds vomiting.
Correct enzyme-substrate pair is
Peyers patches found in the small intestine are
(a) Epithelial tissue
(b) Glandular tissue
(c) Lymphatic tissue
(d) Haemopoietic tissue
Answer: (c) Lymphatic tissue
During prolonged fasting, in what sequence are the following organic compounds used up by the body?
(a) First carbohydrates, next proteins and lastly lipids
(b) First carbohydrates, next fats and lastly proteins
(c) First fats, next carbohydrates and lastly proteins
(d) First proteins next lipids and lastly carbohydrates
Answer: (b) First carbohydrates, next fats and lastly proteins
In glycolysis ultimately
(a) starch is converted into glucose
(b) glucose is converted into fructose
(c) protein is converted into glucose
(d) glucose is converted into pyruric acid
Answer: (d) glucose is converted into pyruric acid
If for some reason our goblet cells are non-functional this will adversely affect
(a) Smooth movement of food down the intestine
(b) Production of somatostatin
(c) Secretion of sebum from the sebaceous glands
(d) Maturation of sperms
Answer: (a) Smooth movement of food down the intestine
The HCl in gastric juice converts:
(a) Disaccharide to monosaccharide
(b) Pepsinogen to pepsin
(c) Prorennin to rennin
(d) Polypeptide to peptide
Answer: (b) Pepsinogen to pepsin
Which enzyme is used in alcoholic fermentation of yeast?
(a) utilising the water taken by body
(b) accumulating the food for digestion
(c) utilisation of absorbed substances
(d) collecting wastes left after the absorption of required nutrients
Answer: (c) utilisation of absorbed substances
The absorbed substances finally reach the tissues which utilise them for their activities. This process is called assimilation.
The pH scale is used to measure
(a) Electric charge on ion
(b) Speed with which ions form
(c) Size of ions
(d) Concentration of hydrogen ions in a solution
Answer: (d) Concentration of hydrogen ions in a solution
Which of the following part of human intestine hosts microorganisms?
Answer: (b) Caecum
Caecum is a small blind sac which hosts some microorganisms.
Duct leading from parotid gland and opening into vestibule is
(a) Wolffian duct
(b) Stensons duct
(c) Haversian duct
(d) Infra-orbit duct
Which organ is most affected by jaundice?
Answer: (b) Liver
Jaundice affects liver. Skin and eyes turn yellow due to the deposition of bile pigments.
Globet cells of intestinal mucosal epithelium secrete
Answer: (a) mucus
Intestinal mucosal epithelium has globet cells which secrete mucus.
Emulsification of fat takes place through
(a) Liver enzymes
(b) Bile pigments
(c) Bile salts
(d) Enzymes of small intestine
Epithelial cells of the intestine involved in food absorption have on their surface
(a) phagocytic vesicles
(b) pinocytic vesicles
(d) zymogen granules
Carrier ions like Na+ facilitate the absorption of substances like
(a) Fructose and some amino acids
(b) Amino acids and glucose
(c) Glucose and fatty acids
(d) Fatty acids and glycerol
Answer: (a) Fructose and some amino acids
The glucose is converted into glycogen in liver and stored in
(a) Liver and spleen
(b) Liver and muscle
(d) Spleen and muscles
Small projections of upper surface of tongue are called
Answer: (c) papillae
The upper surface of the tongue has small projections called papillae, some of them bears taste buds.
Sweetest sugar is
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