BIO 101 | Study Mode

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Question 251
A
kangaroo
B
platypus
C
koala
D
whale.
Explanation
Duck-billed platypus is an egg laying mammal. It is found in the rivers in eastern Australia and Tasmania. It is a beaver like monotreme about 50- 60 cm long and well adapted to life in water. Usually 2 eggs are laid at a time. The female curls around them for incubation and remains inactive for about 2 weeks. Newly hatched young ones are exceedingly immature, naked, blind and each 2.5 cm long.

Correct option: B
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Question 252
A
ascon type
B
leucon type
C
sycon type
D
radial type.
Explanation
Sponges belong to the phylum porifera. Ostia, spongocoel and osculum together form a canal system which is characteristic of all sponges. Canal system of Leticosolenia is of ascon type. It is the simplest type of canal system found in sponges. Water enters directly through ostia into the central spongocoel, which is lined by choanocytes, and leaves through osculum. Sycon type of canal system is found Sycon and Leucon type is found in Spongilla. There is no canal system named as radial type.

Correct option: A
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Question 253
A
male organs occur in posterior proglottides
B
male organs occur in anterior proglottides
C
female organs occur in anterior proglottides
D
mature proglottides contain both male and female organs.
Explanation
There are about 450 mature progiottids forming the middle part of strobila. These are large and squarish in outline. The anterior 100 to 150 progiottids contain only male reproductive organs, while the posterior 250 mature progiottids develop both male and female reproductive organs making them hermaphrodite.

Correct option: D
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Question 254
A
cysticercus
B
rhabditiform
C
hexacanth
D
onchosphere.
Explanation
In Ascaris, rhabditiform larva of first stage is not infective. In a weeks time, it moults within the egg shell and becomes the second stage rhabditoid, which is capable of infecting the host. Cysticercus, hexacanth and onchosphere are the larval stages of Taenia.

Correct option: B
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Question 255
A
A is true but R is false
B
A is false but R is true
C
Both A and R are true and R is correct explanation of A
D
Both A and R are true but R is not correct explanation of A.
Explanation
Cockroaches are found in places where there is warmth, dampness and plenty of organic food to devour. Indoors, they are a common pest in kitchens, latrines, hotels, restaurants, godowns, storerooms, board ships, etc. <br /> Cockroaches are nocturnal creatures. During daytime, they remain inactive and hiding. During night, they show much activity and run here and there in search of food. Being omnivorous and scavengerous in diet, they devour any animal or vegetable substance and even non-living materials like leather, paper, cloth, etc., causing great loss.

Correct option: D
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Question 256
A
pygostyle
B
larynx
C
syrinx
D
synsacrum.
Explanation
At the posterior end or base of the trachea, at its junction with the bronchi, is found a special structure, the syrinx or voice box, concerned with sound production. It is characteristic of birds as it does not occur in other vertebrates.

Correct option: C
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Question 257
A
mouth parts/colour
B
sitting posture
C
antennae/wings
D
feeding habits.
Explanation
Two common mosquito genera, (Anopheles and Culex) can be easily identified by their sitting postures. When sitting, the abdomen of Anopheles is always held at an angle to the surface while that of Culex is held parallel to the surface.

Correct option: B
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Question 258
A
bivalvia
B
gastropoda
C
pelecypoda
D
cephalopoda.
Explanation
In Cephalopoda paired eyes are large, efficient and bulge from the dorso-lateral sides of the head. They bear striking resemblance to those of a vertebrate in that; a cornea, iris, lens and retina are present. Lens projects an inverted image on the retina, as in the vertebrate eye. <br /> External muscle attachments enable limited movements; of the eye. But the embryological development of the cephalopod eye is entirely different from that of the vertebrate eye, so that homologically they are different, for the vertebrate eye is formed as an outgrowth of the brain, while the cephalopod eye is formed by an ectodermal invagination.

Correct option: D
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Question 259
A
asteriodea
B
holothuroidea
C
ophiuroidea
D
crinodiea.
Explanation
Starfishes belong to class Asteroidea, characterized by the presence of five or more arms not sharply set off from a central disc. They are free-living marine animals that occur on sandy or muddy bottoms or crawl about over rocks and shells. All are carnivorous, feeding mainly on crustaceans, polychaetes and molluscs. They also feed on detritus and plankton. They are in general, exhibit remarkable powers of autotomy and regeneration.

Correct option: A
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Question 260
A
echinoidea
B
asteroidea
C
holothuroidea
D
ophiuroidea.
Explanation
Aristotles lantern occurs in the class echinoidea. Five teeth surrounding the mouth are attached to a masticatory apparatus, called Aristotles lantern, after its discoverer and because of its resemblance to an ancient Greek ship-lantern. It is situated within the test and projects slightly through the mouth. It consists of five large calcareous plates, called pyramids or alveoli. By means of special protractor and retractor muscles the lantern can be partially protracted and retracted through the mouth. Aristotles lantern is used in feeding.

Correct option: A

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