31. What are the most important nerves in the human body?
[A] cranial
[B] spinal
[C] Both 1 and 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: C [Both 1 and 2]
Notes:
The most important nerves in the human body are the cranial and spinal nerves. The cranial nerves are 12 in number while the spinal nerves are 31 in number.
32. Which of the following will be pure breeding for only one character?
[A] Hh Rr
[B] HH Rr
[C] HH RR
[D] hh rr
Show Answer
Correct Answer: B [HH Rr]
Notes:
Hh RR would breed correct for the H locus but since it is heterozygous for the R locus, the R character would not be correct.
33. The conversion of N2 to ammonia is known as __
[A] Nitrification
[B] Nitrogen fixation
[C] Ammonification
[D] Denitrification
Show Answer
Correct Answer: B [Nitrogen fixation]
Notes:
The conversion of N2 to ammonia is known as Nitrogen fixation.
34. Which of the following is an enzyme that cleaves proteins?
[A] protease
[B] RNase
[C] lipase
[D] Dnase
Show Answer
Correct Answer: A [protease]
Notes:
Protease is an enzyme that cleaves proteins. These enzymes are made by animals, plants, fungi, and bacteria.
35. Jaws are absent in ____:
[A] Birds
[B] Fishes
[C] Reptiles
[D] Protochordata
Show Answer
Correct Answer: D [Protochordata]
Notes:
Jaws are absent in protochordata and cyclostomata (Agantho stoma). Protochordata refers to invertabrate subphylum of phylum chordata. It includes animals such as tunicates.
36. What are the folds found in the mucous lining of the empty stomach?
[A] Typhlosole
[B] Areolae
[C] Rugae
[D] Villi
Show Answer
Correct Answer: C [Rugae]
Notes:
The inner layer of the stomach is full of wrinkles known as rugae (or gastric folds). Rugae both allow the stomach to stretch in order to accommodate large meals and help to grip and move food during digestion.
37. Dumb-bell shaped guard cells are present in
____:
[A] Mango
[B] Wheat
[C] Gram
[D] Groundnut
Show Answer
Correct Answer: B [Wheat]
Notes:
Monocost and dicots differ in the location of stomata and shape of guard cells. In monocots stomata are Dumb-bell shaped in dicots they are bean-shaped.
38. In which of the following animals, is open circulatory system found?
[A] Prawn
[B] Earthworm
[C] Toad
[D] Man
Show Answer
Correct Answer: A [Prawn]
Notes:
The open circulatory system is a system in which fluid in a cavity called the hemocoel bathes the organs directly with oxygen and nutrients and there is no distinction between blood and interstitial fluid; this combined fluid is called hemolymph. Arthropods and mollusks have an open circulatory system.
39. What is the transplantation of graft between genetically identical individuals?
[A] Autograft
[B] Xenograft
[C] Iso-graft
[D] Allograft
Show Answer
Correct Answer: C [Iso-graft]
Notes:
An isogenic graft or Isograft is a graft between genetically identical individuals (i.e. monozygotic twins). This type of graft donot pose any form of tissue rejection threat by recipient’s body.
40. The deficiency of which nutrient causes night blindness?
[A] Vitamin A
[B] Vitamin C
[C] Vitamin K
[D] Proteins
Show Answer
Correct Answer: A [Vitamin A]
Notes:
Night blindness, also called nyctalopia, is failure of the eye to adapt promptly from light to darkness that is characterized by a reduced ability to see in dim light or at night. It occurs as a symptom of numerous congenital and inherited retinal diseases or as a result of vitamin A deficiency.
