31. Mature females lay eggs and birds develop with the formation of four embryonic membranes known as__
[A] chorion
[B] amnion
[C] allantoin
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Mature females lay eggs and birds develop with the formation of four embryonic membranes known as chorion, amnion, allantoin, and sac of yolk.
32. Langerhans cells are present in which of the following?
[A] Stratum Spinosum
[B] Stratum Basale
[C] Stratum Granulosum
[D] Stratum Corneum
Show Answer
Correct Answer: A [Stratum Spinosum]
Notes:
Langerhans cells are present in the Stratum Spinosum. Stratum Spinosum has 8-10 layers of many-sided keratinocytes which are closely packed.
33. Which structure is part of the tectum?
[A] superior colliculus
[B] periaqueductal grey
[C] substantia nigra
[D] red nucleus
Show Answer
Correct Answer: A [superior colliculus]
Notes:
The superior colliculus structure is part of the tectum. The tectum forms the back of the midbrain and is formed by two paired rounded swellings, the superior and inferior colliculi.
34. The outermost layer of the ovary is made up of ___.
[A] simple cuboidal cells
[B] stereocilia
[C] stroma
[D] cilia
Show Answer
Correct Answer: A [simple cuboidal cells]
Notes:
Ovarian or germinal epithelium is the outermost layer of the ovary composed of simple cuboidal cells. It is actually a modified visceral peritoneum.
35. The population of the vagina with semen during coitus is called __.
[A] Insemination
[B] Outsemination
[C] Copulation
[D] Fertilization
Show Answer
Correct Answer: A [Insemination]
Notes:
Sperm along with other contents of semen populate the vagina. This process is called conception or Insemination.
36. Which of the following is called Mendel’s first law of inheritance?
[A] Law of Dominance
[B] Law of Segregation
[C] Law of Independent Assortment
[D] All of the above
Show Answer
Correct Answer: A [Law of Dominance]
Notes:
The law of dominance is also called Mendel’s first law of inheritance. According to this, the hybrid offspring will only inherit the dominant trait in the phenotype.
37. Mycorrhiza is a symbiotic association between
[A] Bacteria and fungi
[B] Algae and fungi
[C] Fungi and roots of higher plants
[D] Blue green algae and roots of higher plants
Show Answer
Correct Answer: C [Fungi and roots of higher plants]
Notes:
Mycorrhiza is a symbiotic association between fungi and roots of higher plants. A non-disease-producing association in which the fungus invades the root to absorb nutrients is called Mycorrhiza.
38. Who proposed rDNA technology?
[A] Herbert W. Boyer
[B] Stanley N
[C] Both 1 and 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: C [Both 1 and 2]
Notes:
Herbert W. Boyer and Stanley N proposed rDNA technology. Recombinant DNA (rDNA) is a technology that uses enzymes to cut and paste together DNA sequences of interest.
39. ____ is the cell organelle, in which the biochemical processes of respiration and energy production occur:
[A] Ribosomes
[B] Mitochondria
[C] Nucleus
[D] Chloroplast
Show Answer
Correct Answer: B [Mitochondria]
Notes:
Mitochondria is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It is for this reason that mitochondria are often referred to as the powerhouses of the cell mitochondria also play a key role in the ageing process as well as in the onset of degenerative disease.
40. What is Blood?
[A] Muscular tissue
[B] Epithelial tissue
[C] Reproductive tissue
[D] Connective tissue
Show Answer
Correct Answer: D [Connective tissue]
Notes:
Blood is considered a connective tissue for two basic reasons:
(i) embryologically, it has the same origin (mesodermal) as do the other connective tissue types and
(ii) blood connects the body systems together bringing the needed oxygen, nutrients, hormones and other signaling molecules, and removing the wastes.
