BIO 101 | Study Mode

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Question 331
A
fish were amphibious in the past
B
fish evolved from frog-like ancestors
C
frogs will have gills in future
D
frogs evolved from gilled ancestors.
Explanation
It is universally accepted that amphibians (frogs) have originated from fishes. Resemblance of amphibia to fish is seen in most systems of the body. Both are cold blooded. Fish respire by gills and also tadpole of frog respires by gills. To prevent desiccation in air, both usually lay eggs in water.

Correct option: D
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Question 332
A
annelida
B
mollusca
C
cnidaria
D
echinodermata.
Explanation
Echinoderms are triploblastic animals with organ system level of organisation. Larval forms possess bilateral symmetry while adults have radial symmetry.

Correct option: D
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Question 333
A
insecta
B
myriapoda
C
crustacea
D
arachnida and curstacea.
Explanation
Body in arthropoda is segmented. Segments are grouped into 3 forms head, thorax and abdomen. When head and thorax are fused then they are referred to as cephalothorax. Class insecta of arthropoda phylum have body divided into head, thorax and abdomen.

Correct option: A
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Question 334
A
thecodont dentition
B
alveolar lungs
C
ten pairs of cranial nerves
D
seven cervical vertebrae.
Explanation
Mammals have twelve pair of cranial nerves. Ten pairs of cranial nerves are present in fish and amphibians. Reptiles and birds also have 12 pairs of cranial nerves.

Correct option: C
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Question 335
A
absence of body cavity
B
bilateral symmetry
C
radial symmetry
D
presence of pseudocoel.
Explanation
Platyhelminthes do not have body cavity so they are acoelomates. In annelids, the body cavity is true and schizocoelous. Both annelids and platyhelminthes have bilateral symmertry.

Correct option: A
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Question 336
A
redia and miracidium
B
cercaria and redia
C
metacercaria and cercaria
D
miracidium and metacercaria
Explanation
Life cycle of F.hepatica is complete and completed in two hosts. Primary host, in which the adult fluke lives, is sheep. While the intermediate host, in which numerous larval stages are passed, is a snail (Lymnaea, Planorbis, etc.). <br />This type of life cycle, involving two different kinds of hosts, is termed digenetic. Miracidium larva is the larval stage involved in life cycle. When suitable conditions become available, the encapsulated embryo, in 4-15 days, differentiates into a miracidium larva. <br />It hatches out and swims in water. Metacercaria develops into adult fluke only inside its definitive host or sheep. The latter gets infection by grazing on leaves and grass blades to which the cysts are attached. Metacercaria survives action of hosts gastric juice as its cyst is insoluble in it. Cyst wall finally dissolves in proximal part of intestine and liberates the larva.

Correct option: D
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Question 337
A
these are all parasities
B
these are all unicellular protists
C
they have flageila
D
they produce spores
Explanation
Protista is the kingdom of unicellular eukaryotes. The protists include heterotrophs, autotrophs, and some organisms that can vary their nutritional mode depending upon environmental conditions. Protists occur in freshwater, saltwater, soil, and as symbionts within other organisms. Trypanosoma, Noctiluca, Monocystis and Giardia are all unicellular protists.

Correct option: B
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Question 338
A
mollusca and chordata
B
platyhelminthes and arthropoda
C
echinodermata and annelida
D
annelida and arthropoda
Explanation
The term metamerism refers to a linear repetition of parts in an animal body. It occurs in three highly organized phyla: Annelida, Arthropoda and Chordata. Each segment is called a metamere, or somite. Segmentation often affects both external and internal structures. Such a condition is called metameric segmentation. <br /> In chordates, the segmentation is apparent only in the embryonic stage. In the adult chordates, segmentation is visible in the internal structures, such as vertebrae, ribs, nerves and blood vessels. Other animals have unsegmented bodies.

Correct option: D
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Question 339
A
kangaroo, hedgehog, dolphin, Loris
B
lion, bat, whale, ostrich
C
Platypus, penguin, bat, hippopotamus
D
shrew, bat, cat, kiwi
Explanation
Kangaroo, hedgehog, dolphin and Loris are mammals and thus give brith to young ones. Ostrich and kiwi are birds that lay eggs. Platypus is a most primitive living mammal that lays eggs. Other animals in the options are mammals and give birth to young ones.

Correct option: A
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Question 340
A
book lungs and antennae
B
compound eyes and anal cerci
C
jointed legs and chitinous exoskeleton
D
green gland and tracheae
Explanation
Centipede, cockroach, and crab all belong to phylum arthropoda which are characterized by jointed legs and chitinous exoskeleton. Arthropods have bilaterally symmetrical and metamerically segmented body with haemocoel and open blood vascular system.

Correct option: C

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