2018 NEET Biology Questions (51-60)

51. Which of the following hormones can play a significant role in osteoporosis?
(1) Estrogen and Parathyroid hormone
(2) Progesterone and Aldosterone
(3) Aldosterone and Prolactin
(4) Parathyroid hormone and Prolactin
Answer: (1) Estrogen and Parathyroid hormone
52. Which of the following structures or regions is incorrectly paired with its functions?
(1) Hypothalamus : production of releasing hormones and regulation of
temperature,hunger and thirst.
(2) Limbic system : consists of fibre tracts that interconnect different regions of
brain; controls movement.
(3) Medulla oblongata : controls respiration and cardiovascular reflexes.
(4) Corpus callosum : band of fibers connecting left and right cerebral hemispheres.
Answer (2) Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement.


53. The amnion of mammalian embryo is derived from
(1) mesoderm and trophoblast
(2) endoderm and mesoderm
(3) ectoderm and mesoderm
(4) ectoderm and endoderm
Answer (3) ectoderm and mesoderm
NEET Biology Questions 2018
54. Hormones secreted by the placenta to maintain pregnancy are
(1) hCG, hPL, progestogens, estrogens
(2) hCG, hPL, estrogens, relaxin, oxytocin
(3) hCG, hPL, progestogens, prolactin
(4) hCG, progestogens, estrogens, glucocorticoids
Answer (1) hCG, hPL, progestogens, estrogens

55. The difference between spermiogenesis and spermiation is
(1) In spermiogenesis spermatozoa from sertoli cells are released into the cavity of seminiferous tubules, while in spermiation spermatozoa are formed.
(2) In spermiogenesis spermatozoa are formed, while in spermiation spermatids
are formed.
(3) In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.
(4) In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa
are released from sertoli cells into the cavity of seminiferous tubules.
Answer (4) In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.



56. The contraceptive ‘SAHELI’
(1) is an IUD.
(2) increases the concentration of estrogen and prevents ovulation in females.
(3) blocks estrogen receptors in the uterus, preventing eggs from getting implanted.
(4) is a post-coital contraceptive.
Answer (3) blocks estrogen receptors in the uterus, preventing eggs from getting implanted.
57. Ciliates differ from all other protozoans in
(1) using pseudopodia for capturing prey
(2) having a contractile vacuole for removing excess water
(3) using flagella for locomotion
(4) having two types of nuclei
Answer (4) having two types of nuclei
58. I dentify the vertebrate group of animals characterized by crop and gizzard in its digestive system
(1) Aves (2) Reptilia (3) Amphibia (4) Osteichthyes
Answer (1) Aves
59. Which of the following features is used to identify a male cockroach from a female cockroach?
(1) Forewings with darker tegmina
(2) Presence of caudal styles
(3) Presence of a boat shaped sternum on the 9th abdominal segment
(4) Presence of anal cerci
Answer (2) Presence of caudal styles
60. Which one of these animals is not a homeotherm?
(1) Camelus (2) Chelone (3) Macropus (4) Psittacula
Answer (2) Chelone

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