BIO 101 | Study Mode

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Question 331
A
homeothermy 
B
presence of diaphragm 
C
four chambered heart 
D
rib cage. 
Explanation.
The unique feature of mammals is the presence of diaphragm. It is a membrane that separates thoracic cavity from abdominal cavity. The cavity of other animals is not divided into thoracic and abdominal cavities. Homeothermy, four chambered heart and rib cage are the characters of mammals as well as some other animals also.

Correct Option:
B
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Question 332
A
mammals and birds 
B
fish and fresh water protozoans 
C
birds, land reptiles and insects 
D
frogs and toads. 
Explanation.
Uricotelism means excretion of uric acid. Uric acid excretion occurs in organisms which develop in an enclosed egg (where water is severely limited) or which normally experience very dry terrestrial environment as adult organisms. Uric acid is discharged as thick paste or as solid pellet. Egs. terrestrial reptiles, birds, insects, gastropod mollusc etc.

Correct Option:
C
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Question 333
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 334
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 335
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 336
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 337
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 338
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 339
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 340
A
Euglena 
B
Amoeba 
C
Paramecium 
D
Trypanosoma. 
Explanation.
Dimorphic nucleus means two types of nuclei are present in P. caudatum -large macronucleus and small micronucleus. The macronucleus is roughly kidney- shaped and with inconspicuous nuclear membrane. Macronucleus is the somatic or vegetative nucleus and controls the day-to-day metabolic activities of the cell. <br />The micronucleus is lodged in a depression on the surface ofthe macronucleus. It is usually spherical, with a nuclear membrane and with diploid number of chromosomes. It controls the reproductive activities of the organism. Amoeba, Trypanosoma and Plasmodium have only one nucleus.

Correct Option:
C

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