Basic Zoology Questions and Answers
Practice ModeShowing 10 of 98 questions
Q31
Milk tastes sour when kept in the open for sometime due to for-mation of-
Answer: Option B
Explanation: Lactic acid is a carboxylic acid, formed in metabolism of many bacteria. In milk, lactose is converted into lactic acid by metabolic activities of bacteria. Lactic acid
gives sour taste to milk.
Q32
Red tide is caused by-
Answer: Option C
Explanation: Red tide is reddish discolouration of coastal surface waters due to concentrations of certain toxin producing dinoflagellates.
Q33
A type of hypersensitivity to allergen in which humoral antibodies attach to mast cells and basophils, may result in circulatory shock, is called-
Answer: Option B
Explanation: Anaphylaxis is a type of hypersensitivity resulting due to interaction of humoral antibodies with mast cells and basophils.
Q34
Organisms with very high intrinsic growth rates have-
Answer: Option B
Q35
Which of the following organism is iteroparous ?
Answer: Option D
Q36
A micromutation is-
Answer: Option D
Explanation: Mutations which are large and conspicuous are called macromutations and those very inconspicuous are called micromutation. Change in the genic frequency is the constituent of microevolution.
Q37
The limited period of sexual receptivity that occurs around the time of ovulation in all
female mammals except humans is called-
Answer: Option D
Explanation: Estrus is the cyclic period of sexual activity in non human female mammals, characterized by congestion of and secretion by the uterine mucosa. During estrus the animal is said to be ‘in heat’.
Q38
The rate and force of the heart-beat, and the secretion of digestive glands are controlled by-
Answer: Option D
Q39
Glycosidic bond is broken during digestion of-
Answer: Option B
Q40
Postganglionic parasympathetic fibres are-
Answer: Option B
Explanation: Cholinergic fibres include all preganglionic fibres, all postganglionic parasympathetic fibres, which liberate acetylcholine at their nerve endings.