31. Which does not act as a protective barrier for the surface of the body?
[A] Skin
[B] Mucus
[C] Gastric acid
[D] Salivary amylase
Show Answer
Correct Answer: D [Salivary amylase]
Notes:
Salivary amylase does not act as a protective barrier for the surface of the body.
32. The greater omentum connects the stomach to which structures?
[A] Spleen, transverse colon
[B] Spleen, ascending colon
[C] Spleen, descending colon
[D] Spleen, small bowel
Show Answer
Correct Answer: A [Spleen, transverse colon]
Notes:
The greater omentum connects the stomach to Spleen and transverse colon.
33. Ringworm is caused by __
[A] Cryptosporidium parvum
[B] Piroplasmorina
[C] Hypophosphataemia
[D] Trichophyton verrucosum
Show Answer
Correct Answer: D [Trichophyton verrucosum]
Notes:
Ringworm is a contagious skin disease most often caused by Trichophyton verrucosum.
34. A trait produced by the effect of a gene or an allele is called__
[A] Oncogenic Trait
[B] Monogenic trait
[C] Polygenic trait
[D] None of these
Show Answer
Correct Answer: B [Monogenic trait]
Notes:
A trait produced by the effect of a gene or an allele is called a Monogenic trait.
35. The biofertilizer present in the roots of legumes is __
[A] Anabaena
[B] Rhizobium
[C] Azospirillum
[D] All of the above
Show Answer
Correct Answer: B [Rhizobium]
Notes:
Rhizobium leguminocerium bacteria live symbiotically in the root nodules of legumes and some non-legumes. They fix atmospheric N2 and hence increase soil fertility.
36. What is the aerobic digestion of sewage used to produce?
[A] Biomass
[B] Biofuels
[C] Synthetic fuels
[D] Metal articles
Show Answer
Correct Answer: B [Biofuels]
Notes:
Aerobic digestion of sewage is used to produce biofuels. The fuel obtained from biomass is called biofuel.
37. Which one of the following is the smallest endocrine gland in human body?
[A] Pancreas
[B] Thyroid
[C] Pituitary
[D] Adrenal
Show Answer
Correct Answer: C [Pituitary]
Notes:
Pituitary gland, called Master Gland, is the smallest endocrine gland. It controls the general growth of the body coordinating the functioning of other endo crime glands and stimulates the primary sex hormones, i.e. ovaries and testes.
38. Wilting of plants occurs due to excessive ____:
[A] Respiration
[B] Glutation
[C] Absorption
[D] Transpiration
Show Answer
Correct Answer: D [Transpiration]
Notes:
Plant wilting occurs after excessive loss of water by transpiration and lesser absorption. i.e. rate of transpiration exceeds rate of water absorption. On a hot day, plants transpire heavily and cannot absorb water speedily to keep pace with transpiration loss, even when there is enough water.
39. In male sharks, Claspers are found attached to
____:
[A] Anal fin
[B] Ventral fin
[C] Pectoral fin
[D] Pelvic fin
Show Answer
Correct Answer: D [Pelvic fin]
Notes:
Claspers are organs found in male elasmobranchs. Each male has two claspers. They are located along the inner side of the shark or ray’s pelvic fin and are used in reproduction. During mating, the male deposits his sperm into the female’s cloaca (the opening that serves as the entrance to the uterus, intestine and urinary tract) via grooves that lie in the upper side of the claspers.
40. The basic structural and functional unit of living organisms is ____:
[A] Systems
[B] Cell
[C] Tissue
[D] Organ
Show Answer
Correct Answer: B [Cell]
Notes:
Robert Hooke (1665) observed a section of cork under his microscope and found its structure resembling a ‘honey comb’. He gave the name ‘cell’ to each of the compartments of the honey comb like structure. Two German biologists, M Schleiden and T Schwann, later proposed the famous cell theory in 1938-39.
