Basic Zoology Questions and Answers

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Q11
Which of the following law is associated with the fact that anterior spinal nerve roots contain only motor fibres and posterior roots only sensory fibres ?
  • A Magendie’s law
  • B Bell’s law
  • C Both (A) and (B)
  • D None of these
Answer: Option C
Q12
In birds-
  • A Left oviduct and right aortic arch are present
  • B Left oviduct and left aortic arch are present
  • C Right oviduct, left ovary and right aortic arch are present
  • D Left oviduct, left ovary and right aortic arch are present
Answer: Option B
Q13
Ancestral amphibians were tetrapods that evolved during-
  • A Devonian period
  • B Carboniferous period
  • C Jurassic period
  • D Cretaceous period
Answer: Option B
Explanation: Carboniferous was the recent period of the Palaeozoic, some 355–280 million years ago. It was characterized by the evolution amphibians on swampy land, a few primitive early reptiles and giant ferns.
Q14
Community health services involves-
  • A Control of communicable diseases
  • B School and health education
  • C Awareness of clean environment
  • D All the above
Answer: Option D
Q15
The active rolling over of endodermal and mesodermal cells from the embryo surface into the interior is defined as-
  • A Ingression
  • B Involution
  • C Epiboly
  • D Inversion
Answer: Option B
Explanation: Involution is rolling over of cells during gastrulation from the surface towards interior of the developing gastrula.
Q16
The wall of heart is made up of-
  • A Epicardium
  • B Myocardium
  • C Endocardium
  • D All the above
Answer: Option D
Explanation: Heart’s wall possesses three layers, i.e., the outer epicardium (serous layer), the middle myocardium (cardiac muscle), and the inner endocardium. Endocardium lines the four chambers of the heart and covers the valves.
Q17
Genetic counsellors can identify heterozygous individuals by-
  • A Height of individual
  • B Colour of individual
  • C Screening procedures
  • D All the above
Answer: Option C
Explanation: Carriers of genetic disorders (those heterozygous for the condition, but who do not themselves exhibit it) can be diagnosed through screening procedures during genetic counselling.
Q18
Which of the following enzyme is secreted by intestinal mucosa that remain closely associated with the microvilli ? (A) Peptidase
  • A and
  • B Disaccharidase
  • C Trypsin
  • D Both
Answer: Option D
Explanation: The epithelial cells of the intestinal mucose manufacture and secrete peptidase and disaccharidase digestive enzymes. They are not released into the lumen of the intestine but remain closely associated with the microvilli of the epithelial cells.
Q19
Which of the following is absorbed by intestinal mucosa by active transport ?
  • A Galactose
  • B Glucose
  • C Fructose
  • D Both (A) and (B)
Answer: Option D
Explanation: The glucose and galactose enter intestinal mucosa by active transport, while fructose enters by facilitated diffusion.
Q20
A starving person consumes first-
  • A Body fats
  • B Body proteins
  • C Vitamins
  • D Stored glycogen
Answer: Option D
Explanation: The liver stores glycogen to fulfil body’s requirement of glucose for energy during starvation.

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