BIO 101 | Study Mode

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Question 301
A
metamorphosis
B
neoteny
C
metagenesis
D
all of these.
Explanation
Obelia belongs to the phylum coelenterata. In Obelia, life-cycle includes two clearly defined phases: <br />A fixed polypoid phase (hydroid colony) and a pelagic medusoid phase. Hydroid colony has no gonads and reproduces by asexual budding to give rise to medusae. On the other hand, medusae reproduce exclusively by sexual method (ova and sperms) to give rise to new hydroid colonies. This fact apparently seems to have given rise to the idea of alternation of generations, also called metagenesis.

Correct option: C
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Question 302
A
echinodermates
B
platyhelminthes
C
annelids
D
molluscs.
Explanation
Solenocytes are also called flame cells. It is a cup shaped cell, which contains group of cilia and this is the main excretory organ of platyhelminthes.

Correct option: B
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Question 303
A
reptilia
B
land vertebrates
C
aves
D
mammals.
Explanation
Aves are the animals that fly so their body weight should be less and for this their bones are hollow and connected by air passages. Reptilia, land vertebrates and mammals do not have hollow bones.

Correct option: C
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Question 304
A
pelvic girdle
B
pectoral girdle
C
hind limb
D
for limb.
Explanation
Fore limbs are absent in birds as they are modified into wings for flight. They are attached high on the back, to the anterior or thoracic region of the trunk, and are very powerful when compared with the size and strength of the bird. Each wing is elongated, flattened and distally pointed with its longitudnal axis at right angles to that of the trunk. Hind limb is made of three parts thigh, shank and foot. Pectoral girdle on each side consists of three bones a large coracoid, scapula and clavicle. Pelvic girdle consists of ilium, ischium and pubis.

Correct option: D
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Question 305
A
echinoderms
B
sponges
C
helminthes
D
coelenterates.
Explanation
The body wall of sponges encloses a large cavity, the spongocoel and in most cases also contains in its thickness numerous small cavities, the canals. Either the spongocoel or certain canals are lined by choanocytes with flagella. <br />The ceaseless beating of flagella maintains a steady current of water through the canals in the sponge body. The current of water enters through small pores, the dermal ostia, perforating the porocytes and, after passing through various canals, enters the spongocoel, and finally leaves through a larger aperture, the osculum, or apertures, the oscula. <br />All the cavities in a sponge body are intercommunicating, and are collectively referred to as the canal system. The current of water that flows through the canal system brings in food and oxygen, and carries away carbon dioxide and nitrogenous waste materials. Thus, the canal system helps the sponge in nutrition, respiration and excretion.

Correct option: B
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Question 306
A
poikilothermic
B
honioiothermic
C
aquatic
D
desert living.
Explanation
Poikilothermic animals are those whose body temperature varies with the temperature of the environment. All animals except birds and mammals are poikilothermic. Although unable to maintain a constant body temperature, they can respond to compensate for very low or very high temperatures. <br />For example, the tissue composition (especially cell osmotic pressure) can change to regulate the blood flow to peripheral tissues (and thus increase heat loss or heat absorption), and the animals can actively seek sun or shade. Homoiothermic animals are those whose body temperature remains constant irrespective of the variations in the temperature of the environment.

Correct option: A
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Question 307
A
ureotelic
B
Ureotelic in water
C
ammonotelic
D
ureotelic over land
Explanation
The waste material of aquatic reptiles chiefly consists of urea, so they are ureotelic. Land forms are uricotelic i.e., their water material consists of uric acid.

Correct option: B
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Question 308
A
Platypus is oviparous
B
bats have feather
C
elephant is ovoviviparous
D
diaphragm is absent in them.
Explanation
Mammals are viviparous i.e. they give birth to young ones. Protherians (e.g., Platypus) are primitive mammals and lay eggs, so they are oviparous.

Correct option: A
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Question 309
A
diaphragm
B
coelom
C
pharyngeal gill clefts
D
dorsal nerve cord.
Explanation
Diaphragm is a membrane that separates thoracic cavity from abdominal cavity. It is present only in mammals. All other chordates do not have diaphragm as their body cavity is not divided into thoracic and abdominal cavities. Chordates are coelomate animals having a true coelom, entercoelicand shizocoelic in origin. Pharyngeal gill slits are present at some stage, may or may not be functional. Nerve cord is dorsal and tubular.

Correct option: A
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Question 310
A

will become flexible

B

will turn black

C

will break into pieces

D

will shrink.

Explanation

Main component of bone is collagen which is a complex combination of amino acids. When frogs bone is treated with HCl, these compounds are broken down and the bone becomes flexible.


Correct option: A

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