BIO 101 | Study Mode

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Question 231
A
pelvic girdle 
B
skull 
C
hind limbs 
D
pectoral girdle/clavicles. 
Explanation.
Share Answer The wishbone, known in anatomy as the furcula, is a sternum bone found in birds which is shaped like the letter Y. It is used as an attachment point for the wing muscles. It is so named because of a tradition: Two people pull on each side of such a bone, and when it breaks, the one who gets the larger part is said to have a wish granted. Two clavicles fused with inter clavicle to form a fork shaped bone called wish bone.

Correct Option:
D
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Question 232
A
hairy skin 
B
true placentation 
C
ovoviviparity 
D
glandular skin. 
Explanation.
Share Answer Eutheria is a taxon containing the placental mammals, such as humans. Nevertheless, all Eutherians are placental mammals. This means that a Eutherian foetus is nourished during gestation by a placenta. Eutherians are also viviparous, meaning that the offspring are carried in the mothers womb until fully developed.

Correct Option:
B
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Question 233
A
blue with haemocyanin in corpuscles 
B
blue with haemocyanin in plasma 
C
red with haemoglobin in corpuscles 
D
red with haemoglobin in plasma. 
Explanation.
Share Answer Circulatory or blood vascular system of earthworm is a closed system consisting of blood vessels and capillaries which ramify to all parts of the body. Blood is composed of fluid plasma and colourless corpuscles, physiologically comparable to the leucocytes of the vertebrates. The red respiratory pigment, haemoglobin (or erythrocruorin) occurs dissolved in plasma. It gives a red colour to blood and aids in the transportation of oxygen for respiration.

Correct Option:
D
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Question 234
A
excretory organs of insects 
B
excretory organs of annelids 
C
respiratory organs of insects 
D
respiratory organs of annelids. 
Explanation.
Share Answer In insects malpighian tubules are attached to the alimentary canal at the extreme anterior end of hindgut. These are fine, long, unbranched, yellowish and blind tubules lying freely in the haemolymph. These are between 60 to 150 in number and are arranged in 6-8 bundles. These excrete out nitrogenous wastes from the body in the form of uric acid.

Correct Option:
A
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Question 235
A
Ascaris 
B
Fasciola 
C
Taenia 
D
Planaria. 
Explanation.
Share Answer Eggs of Taenia undergo cleavage to form morula. Morula, at its morphologically posterior end, develops three pairs of chitinous hooks secreted by differentiated cells, called onchoblasts. This six-hooked embryo, called hexacanth, possesses a pair of large penetration glands; it is surrounded by two hexacanth membranes. The hexacanth, together with all the membranes surrounding it, is known as onchosphere. <br /> The secondary or intermediate host acquires infection by ingesting the onchospheres. Pig, which regularly feeds on human excreta is the usual secondary host, but dog, monkey and sheep are also known to get the infection. Man himself may serve as the secondary host by ingesting onchospheres with inadequately cooked or raw vegetables.

Correct Option:
C
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Question 236
A
absence of scolex hooks 
B
absence of scolex hooks and uterine branching 
C
absence of scolex hooks and presence of both male and female reproductive organs 
D
presence of scolex hooks. 
Explanation.
Share Answer 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. Its intermediate hosts are cattle and buffaloes. It is longer than T.solium, usually attaining a length upto 12 meters or more. Scolex bears four strong, rounded, adhesive suckers but lacks hooks. Strobila comprises up to 2,000 progiottids. A gravid proglottid contains about 100,000 eggs. Uterus of gravid progiottids has 15 to 35 branches on either side.

Correct Option:
A
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Question 237
A
their burrows make the soil loose 
B
they make the soil porous, leave their castings and take organic debris in the soil 
C
they are used as fish meal 
D
they kill the birds due to biomagnification of chlorinated hydrocarbons. 
Explanation.
Share Answer Pherelima posthuma is highly useful and beneficial in agriculture. Its habit of burrowing and swallowing earth makes it porous and increases the soil fertility in many ways. Their burrows permit penetration of air and moisture in porous soil and their excretory wastes and other secretions also enrich soil by adding nitrogenous matters to the soil. <br /> Pherelima posthuma is not used as fish meal. Whereas a small white earthworm (Enchytraeus albidus) is often grown in soil and used to feed aquarium fish.

Correct Option:
B
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Question 238
A
housefly 
B
bed bug 
C
sand Fly 
D
fruit Fly. 
Explanation.
Share Answer Visceral leishmaniasis, also known as kala- azar and black fever, is the most severe form of leishmaniasis, a disease caused by parasites of the Leishmania genus.lt is transmitted by sand fly. The adult female sand fly is a bloodsucker, usually feeding at night on sleeping prey. When the fly bites an animal infected with L. donovani, the pathogen is ingested along with the preys blood. <br /> Leishmania tropica produces skin ulcers known as oriental sore or Delhi sore. The disease is spread by sand flies. The parasite lives in the endothelial cells of skin capillaries. It leads to ulcerated wounds with raised edges. They do not cause much pain.

Correct Option:
C
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Question 239
A
Australia 
B
Antarctica 
C
Africa 
D
America 
Explanation.
Share Answer Penguins are a group of aquatic, flightless birds living almost exclusively in Antarctica. All penguins are countershaded that is, they have a white underside and a dark (mostly black) upperside. This is for camouflage.

Correct Option:
B
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Question 240
A
stratum corneum 
B
epidermis 
C
dermis 
D
stratum malpighi. 
Explanation.
Share Answer The stratum corneum (the horny layer) is the outermost layer of the epidermis (the outermost layer of the skin). It is composed mainly of dead cells that lack nuclei. In reptiles, the stratum corneum is permanent, and is only replaced during times of rapid growth, in a process called ecdysis or moulting. During ecdysis, small fragments of this layer are periodically shed of from the body. The new layer is regularly formed by underlying stratum germinativum.

Correct Option:
A
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