31. Which of the following is not a bacterium which causes disease in a poultry farm?
[A] Tapeworm
[B] Haemophilus gallinarium
[C] Salmonella gallinarium
[D] Pasteurella avicida
Show Answer
Correct Answer: A [Tapeworm]
Notes:
Several species of tapeworms cause taeniasis. Salmonella gallinarium causes foul typhoid or salmonellosis. Haemophilus gallinarium causes foul coryza. Pasteurella avicida causes chicken cholera.
32. Tetanus is caused by which of the following causative agent?
[A] Vibrio cholerae
[B] Corynebacterium diptheriae
[C] Treponema pallidum
[D] Clostridium tetani
Show Answer
Correct Answer: D [Clostridium tetani]
Notes:
Tetanus is caused by Clostridium tetani bacteria. This is a serious disease of the nervous system.
33. The point mutation results in a change in the codon, which then codes for another amino acid is called __
[A] Silent mutation
[B] Nonsense mutation
[C] Missense mutation
[D] None of these
Show Answer
Correct Answer: C [Missense mutation]
Notes:
The point mutation results in a change in the codon, which then codes for another amino acid is called Missense mutation.
34. Where is compound manure made?
[A] Rotted vegetable and animal refuse
[B] Farmyard manure and green manure
[C] Farm refuse and household refuse
[D] Organic wastes from which biogas has been extracted
Show Answer
Correct Answer: A [Rotted vegetable and animal refuse]
Notes:
Compound manure is made of Rotted vegetables and animal refuse. A fertilizer that contains two or more nutrients and is also known as a multi-nutrient fertilizer is called Compound manure.
35. Which of the following makes the skin layer impervious to water?
[A] Melanin
[B] Collagen
[C] Keratin
[D] Chitin
Show Answer
Correct Answer: C [Keratin]
Notes:
Keratin is a family of fibrous structural proteins involved in making up the outer layer of human skin. It is also the key structural component of hair and nails. Cells in the epidermis contain a structural matrix of keratin, which makes this outermost layer of the skin almost waterproof, and along with collagen and elastin, gives skin its strength. It also makes up fish scales and crustacean shells, bird feathers and beaks, animal horns and hooves.
36. Animals with Chitinous exoskeleton are ____:
[A] Sea-Urchin
[B] Insects
[C] Sponges
[D] Snails
Show Answer
Correct Answer: B [Insects]
Notes:
Chitin is the main component of the cell walls of fungi, the exoskeletons of arthropods such as crustaceans (e.g., crabs, lobsters and shrimps) and insects, the radulas of molluscs, and the beaks and internal shells of cephalopods, including squid and octopuses. Combined with calcium carbonate, as in the shells of Crustacean and molluscs, chitin produces a much stronger composite for protection.
37. Columba livia is the scientific name of _____:
[A] Pigeon
[B] Shark
[C] Snake
[D] Rabbit
Show Answer
Correct Answer: A [Pigeon]
Notes:
The Rock Dove (Columba livia) or Rock Pigeon, is a member of the bird family Columbidae (doves and pigeons). In common usage, this bird is often simply referred to as the “pigeon”. The species includes the domestic pigeon (including the fancy white pigeon).
38. Which of the following microorganisms is used in milk curdling?
[A] Bacillus
[B] Lactobacillus
[C] Leuconostoc
[D] Acetobacter
Show Answer
Correct Answer: B [Lactobacillus]
Notes:
Lactobacillus acidiphilous is used in milk curdling by producing lactic acid and reducing the pH of the milk. These bacteria convert the lactose into lactic acid, which imparts the sour taste to curd. It is a genus of Gram positive facultative anaerobic or microaerophilic rod-shaped bacteria.
39. The tissue in man where no cell division occurs after birth is ____:
[A] Nerves
[B] Skeletal
[C] Connective
[D] Germinal
Show Answer
Correct Answer: A [Nerves]
Notes:
Cell division is the process by which cells produce new cells. In animals some tissues must be repaired often such as the lining of gut, white blood cells, skin cells with a short lifespan. Other cells do not divide at all after birth are neurons.
40. The smallest flowering plant is ____:
[A] Lemma
[B] Wolffia
[C] Ficus
[D] Azolla
Show Answer
Correct Answer: B [Wolffia]
Notes:
Wolffia is a genus of 9 to 11 species which include the smallest flowering plants on Earth. Commonly called water-meal or duckweed, these aquatic plants resemble specks of cornmeal floating on the water. Wolffia species are free-floating thalli, green or yellow-green, and without roots. The flower is produced in a depression on the top surface of the plant body. It has one stamen and one pistil.