BIO 101 | Study Mode

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Question 291
A
super female
B
super male
C
intersex
D
gynandromorph.
Explanation
Gynandromorph is an animal that possesses both male and female characteristics because it is genetically a mosaic, i.e. some of its cells are genetically male and others are female. This phenomenon is found particularly in the insects but also appears in the birds and mammals; it is often due to the loss of an X chromosome in a stem cell of a female (XX), so that all tissues derived from that cell are phenotypically male. <br />Intersex is an organism displaying characteristics that are intermediate between those of the typical male and typical female of its species. For example, a human intersex may have testes that fail to develop, so that although he is technically a man he has the external appearance of a woman. <br />In super female and super male the number of female and male sex chromosomes, respectively, is above normal.

Correct option: D
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Question 292
A
they all have calcareous spicules
B
they have high regenerative power
C
they are found only in marine water
D
they are all radially symmetrical.
Explanation
Sponges may have calcareous or siliceous spicules. All sponges are not marine, some are freshwater living also. Sponges may be asymmetrical or bilaterally symmetrical, besides being radially symmetrical. So, these characters are with exception. The character without exception is the regenerative power of sponges. <br />All sponges have a good power of regeneration. They can regrow any part of the body lost or cut off. Small fragments can grow into a complete sponge.

Correct option: B
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Question 293
A
an egg with blastula
B
an egg with a juvenile
C
an egg with an egg
D
an egg with gastrula.
Explanation
The embryonated egg of Ascaris represents an egg with a juvenile. In case of Ascaris, the eggs containing the second stage of juvenile are called embryonated egg. These are infective to human host. In suitable conditions of temperature and moisture these eggs can survive for 5 to 6 years in the soil.

Correct option: B
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Question 294
A
metanephros
B
opisthonephros
C
pronephros
D
mesonephros.
Explanation
Mesonephros kidney is present in both adult as well as embryo of frog. A mesonephros develops from the middle part of intermediate mesoderm, posterior to each pronephros soon after its degeneration.

Correct option: D
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Question 295
A
the communication between the pharynx and the tympanic cavity
B
the external opening of the tympanic cavity which is covered by the tympanic membrane
C
the air filled cavity of the middle ear
D
the opening in the auditory capsule which separates the middle ear from the internal ear.
Explanation
The bony partition between tympanic cavity (cavity of middle ear) and auditory capsule (internal ear) is perforated by a small window-like oval aperture, the fenestra ovalis, which remains closed by a membrane and a cartilaginous nodule, the stapedial plate.

Correct option: C
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Question 296
A
pterygoid
B
hyoid apparatus
C
parasphenoid
D
palatine.
Explanation
In adult frog, gills disappear and their skeletal framework is also reduced to form hyoid apparatus. It lies below tongue in the floor of mouth and provides surface of attachment to the tongue. <br />Pterygoid contributes to the postero-ventral margin of orbit of its side. Palatine connects the anterior side of cranium with the middle of maxilla. Parasphenoid forms floor of the cranium.

Correct option: B
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Question 297
A
frontoparietal
B
orbitosphenoid
C
parasphenoid
D
alisphenoid.
Explanation
Fronto-parietals are a pair of long, broad, flattened and membranous bones. They are united along the mid-dorsal line and form the whole roof of cranium. In larval frog, each fronto-parietal occurs into separate frontal and parietal parts, but in adult frog, they become fused to form a single frontoparietal. The entire floor of cranium is covered and strengthened by a large parasphenoid bone.

Correct option: A
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Question 298
A
jointed legs
B
metamorphosis
C
compound eyes
D
poison glands.
Explanation
Silver fish, scorpion, crab and honey bee all have compound eyes. These are present on each lateral side of the head and are convex. This eye consists of numerous visual units, the ommatidia. Each ommatidium consists of an outer cuticle covering lenses, beneath which are 6-8 retinal cells surrounding a light sensitive rhabdom. Adjacent ommatidia are separated by pigment cells.

Correct option: C
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Question 299
A
epithelial cells
B
spermatocytes
C
Leydigs cell
D
Sertoli cells.
Explanation
The connective tissue in between the seminiferous tubules of the testis contains special interstitial cells or cells of Leydig. They secrete the male sex hormones (androgens) such as testosterone. It stimulates secondary sexual characteristics of the male such as the enlargement of the external genitals and accessory glands.

Correct option: C
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Question 300
A
dentary
B
maxills
C
angulars
D
mandible.
Explanation
Dentary is a membrane bone, present in the lower jaw of the vertebrates, that supports the teeth. In mammals the dentary is the sole bone of the lower jaw. The dentary bone is relativley short comma shaped bone.

Correct option: A

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