31. What contagious skin condition leaves small circular patches of bare skin?
[A] Ringworm
[B] Thrush
[C] Round worm
[D] Psoriasis
Show Answer
Correct Answer: A [Ringworm]
Notes:
Ringworm of the body is a fungal infection that can cause an itchy, circular rash.
32. Through which place do microorganisms enter our body?
[A] Respiratory tract
[B] Urogenital tract
[C] Gastrointestinal tract
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Microorganisms enter our body from various places:
1. the respiratory system
2. urogenital tract
3. gastrointestinal tract
4. skin surface
33. The pathogen causing Amoebiasis is transmitted through__.
[A] By touch
[B] Insect bite
[C] Food or water contaminated with cysts
[D] Droplet Infection
Show Answer
Correct Answer: C [Food or water contaminated with cysts]
Notes:
The pathogen causing Amoebiasis is transmitted through food or water contaminated with cysts.
34. Which two traits characterize a single gene?
[A] Seed colour and shape
[B] Flower colour and position
[C] Colour of flower and seed coat
[D] Height and colour of seed
Show Answer
Correct Answer: C [Colour of flower and seed coat]
Notes:
The Colour of the flower and seed coat are the two traits that characterize a single gene.
35. Which is the best example of incomplete dominance?
[A] Wavy hair
[B] Sickle cell anemia
[C] Tay Sachs disease
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Wavy hair, Sickle cell anemia, and Tay Sachs disease are the best example of incomplete dominance.
36. What is an autonomously repeating circular extra-chromosomal DNA?
[A] Bacteria
[B] Nitrogenous base
[C] RNA
[D] Plasmid
Show Answer
Correct Answer: D [Plasmid]
Notes:
A plasmid is an autonomously repeating circular extra-chromosomal DNA. They naturally exist in bacterial cells, and they also occur in some eukaryotes.
37. An eardrum is absent in ____:
[A] Snakes
[B] Toads
[C] Turtles
[D] Tuatara
Show Answer
Correct Answer: A [Snakes]
Notes:
The ear has three main parts: the outer, middle and inner ear. The outer ear consists of the pinna and the auditory canal. The middle ear is filled with air and contains three tiny bones called ossicles – the anvil, hammer and stirrup. The inner ear contains the semicircular canals and the cochlea. Eardrum is the membrane of middle ear. Snakes have fully developed inner ear structures but no eardrum.
38. The type of kidneys present in frog are ___:
[A] Metanephros
[B] Pronephros
[C] Archinephros
[D] Mesonephros
Show Answer
Correct Answer: D [Mesonephros]
Notes:
In the frog, Mesonephros is the functional kidney in embryonic as well as adult stage and mesonephric duct functions as both urinary and genital duct. Tubules of the anterior region of kidney get connected to testis to collect spermatozoa, while the posterior region remains as functional kidney and transports urinary wastes to the exterior.
39. Which one of the following animals is sanguinivorous?
[A] Fruit-fly
[B] Mosquito
[C] House-fly
[D] Snail
Show Answer
Correct Answer: B [Mosquito]
Notes:
The literal meaning of ‘sanguinivorous’ is someone subsisting on a diet of blood, or blood-sucking bats and animals. Mosquitoes belong to this category. Leech, female mosquitoes, vampire bats are other examples of Sanguivores.
40. In a poultry unit, the factor most influencing the cost is the cost of
____:
[A] Feed
[B] Chicks
[C] Transportation
[D] Medicines
Show Answer
Correct Answer: A [Feed]
Notes:
Feed cost is one of the important variable costs that plays a big role in determining the poultry cost. Variable costs rise and fall with the size of the output and the level of the operation. Fixed costs (for items such as taxes, insurance, interest, and depreciation on buildings and equipment), are incurred whether or not there is any output. Moreover the feed of broilers and layers varies with time of their growth.
