BIO 101 | Study Mode

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Question 261
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 262
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 263
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 264
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 265
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 266
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 267
A
Hydra
B
tapeworm
C
earthworm
D
Frogs tadpole.
Explanation

Correct option: A
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Question 268
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 269
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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Question 270
A
running birds
B
migratory birds
C
flightless birds
D
four toed birds.
Explanation
The Ostrich is a flightless bird native to Africa. It is the only living species of its family. It is distinctive in its appearance, with a long neck and legs and the ability to run at speeds of about 65 km/h (40 mph), the top land speed of any bird. Penguins are a group of aquatic, flightless birds living almost exclusively in the Southern Hemisphere. A kiwi is any of the species of small flightless birds endemic to New Zealand.

Correct option: C

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