BIO 101 | Study Mode

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Question 261
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 262
A
absence of neck 
B
muscular diaphragm between thorax and abdomen? 
C
extra-abdominal testes to avoid high temperature of body 
D
presence of external ears. 
Explanation.
Whale, bat and rat are mammals. Diaphragm is present in mammals. The diaphragm separates the thoracic cavity (with lung and heart) from the abdominal cavity (with digestive system and urogenital system). In its relaxed state, the diaphragm is shaped like a dome. It is controlled by the phrenic nerve.

Correct Option:
B
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Question 263
A
species 
B
genus 
C
family 
D
order. 
Explanation.
Gorilla, chimpanzee, monkeys and humans belong to the same order i.e. primates. They have well developed brain, flat nails on fingers and toes. First digit is usually opposable, an adaptation for grasping. Eyes are typically large and turned forward.

Correct Option:
D
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Question 264
A
thick skin 
B
dry skin 
C
smooth skin 
D
moist skin. 
Explanation.
Mucus helps frog in forming moist skin as skin is its respiratory organ.

Correct Option:
D
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Question 265
A
frog, lizard and cockroach 
B
Ascaris, housefly and frog 
C
housefly, earthworm and mosquito 
D
butterfly, frog and mosquito. 
Explanation.
In butterfly, the larval stage is known as catterpillar, in frog is known as tadpole and in mosquito is known as wriggler.

Correct Option:
D
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Question 266
A
paried nature 
B
noncollapsible walls 
C
ciliated inner lining 
D
origin from head. 
Explanation.
Tracheae act as passage of air during respiration in both cockroach and mammals. In cockroach, the cuticular lining is spirally thickened forming taenidia which prevents the tracheal tubes from collapsing. In mammals, cartilaginous rings supporting the walls of the tracheae prevent their collapsing.

Correct Option:
B
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Question 267
A
starfish and Hydra 
B
Hydra and sponges 
C
tapeworm and Hydra 
D
sponge and starfish. 
Explanation.
Budding is an asexual mode of reproduction in hydra and sponges. Bud is formed as an outgrowth on the body surface, then detached to form new animal.

Correct Option:
B
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Question 268
A
Hydra 
B
tapeworm 
C
earthworm 
D
Frogs tadpole. 
Explanation.
Correct Option:
A
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Question 269
A
life history has pig as intermediate host 
B
there are two large suckers on scolex 
C
rostellar hooks are absent 
D
rostelium has double circle of hooks. 
Explanation.
The beef tapeworm Taenia saginata is similar to the pork tapeworm Taenia solium, in structure and life history. It is the commonest tapeworm of man with a much greater incidence than that of T.solium. Scolex bears four strong, rounded, adhesive suckers but lacks hooks and rostellum.

Correct Option:
C
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Question 270
A
trichocysts in Paramecium 
B
pedicellariae of star fish 
C
clitellum in Pheretima 
D
posterior sucker in Hirudinaria. 
Explanation.
The looping or crawling movement in Hirudinaria is performed with the help of muscles and suckers which serve for attachment.

Correct Option:
D

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