BIO 101 | Study Mode

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Question 271
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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Question 272
A
frogs tadpole 
B
prawn 
C
C.helifer 
D
cockroach. 
Explanation.
In the open circulatory system, the blood is not confined to the blood vessels, but it flows in the open spaces. Prawn, Chelifer and cockroach have open circulatory system. Frogs tadpole has closed circulatory system, that is the blood flows in the blood vessels.

Correct Option:
A
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Question 273
A
birds and lizards 
B
frogs and cartilaginous fish 
C
insects and bony fish 
D
mammals and molluscs. 
Explanation.
Birds and lizards are uricotelic. Uricotelic animals are those that excrete nitrogenous waste in the form of uric acid. It is being insoluble in water, does not require water for its elimination. Frogs and cartilaginous fish are ureotelic, that is they excrete nitrogenous waste in the form of urea. The main excretory matter of insects is uric acid and of bony fish is ammonia (ammoniotelic). Molluscs may be ammoniotelic or uricotelic. Mammals are ureotelic (excretory matter is urea).

Correct Option:
A
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Question 274
A
starfish 
B
jellyfish 
C
crayfish 
D
cuttlefish. 
Explanation.
Starfish belongs to the phylum echinodermata who have developed tube feet for locomotion. The tube feet generally protrude out through special radial areas called ambulacra. They are extended and retracted by variations in hydraulic pressure of fluid in them and by contractions of their muscles. <br /> Cuttle fish belongs to the phylum mollusca and it swims. Crayfish belongs to the phylum arthropoda in which locomotion occurs by jointed appendages. Jelly fish belongs to the phylum cnidaria and it swims.

Correct Option:
A
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Question 275
A
Plasmodium 
B
Schistosoma 
C
Trypanosoma 
D
Wuchereria. 
Explanation.
Platyhelminthes have soft and dorsoventrally flattened body with bilateral symmetry. Plasmodium and Trypanosoma belong to phylum protozoa while Wuchereria belongs to phylum aschelminthes.

Correct Option:
B
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Question 276
A
are attached to the substratum 
B
have one opening of alimentary canal 
C
live in water 
D
have ciliary mode of feeding. 
Explanation.
The organisms attached to the substratum possess radial symmetry in all vertical planes. All the animals belonging to cnidaria (e.g. jellyfish) and echinodermata (e.g. starfish) are radially symmetrical and typically sessile in their adult form. In radial symmetry the parts in an organ or organism when cut through the centre in any direction produces two halves that are mirror images of each other.

Correct Option:
A
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Question 277
A
nasal cavity, larynx, pharynx, trachea, bronchi, alveoli 
B
nasal cavity, larynx, pharynx, trachea, bronchioles, alveoli 
C
nasal cavity, pharynx, larynx, trachea, bronchioles, bronchi, alveoli 
D
nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, alveoli. 
Explanation.
Air passes from the external nares into the nasal cavity where the dust particles are trapped. From nasal cavity, the air moves into pharynx which is a short, vertical tube. It further leads into two tubes, trachea and oesophagus. Larynx is the upper part of trachea. Besides forming a part of the respiratory tract, it also serves as the voice box. Trachea is a thin walled tube that extends downward through the neck. It divides into two primary bronchi which on entering the lungs divide into fine branches called bronchioles which enter the alveoli. Exchange of gases occurs in alveoli.

Correct Option:
D
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Question 278
A
polymorphism 
B
flame cells 
C
hermaphroditism 
D
nematocysts. 
Explanation.
nematocysts.

Correct Option:
D
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Question 279
A
the division of body into head, neck, trunk and tail 
B
their body covered with an exoskeleton 
C
the possession of two pairs of functional appendages 
D
the presence of well-developed skull. 
Explanation.
The sub-phylum vertebrata or craniata have a well developed central nervous system that is differentiated into brain and spinal cord. Brain is protected by a brain box called cranium, so they are also called as craniata.

Correct Option:
D
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Question 280
A
human females only 
B
mammalian females other than primates 
C
human males only 
D
mammalian males other than primates. 
Explanation.
Oestrous cycle comprises cyclic changes in female reproductive system of non-primate mammals like cows, dogs, etc. The oestrous cycle consists of a short period of oestrous or heat (e.g., 18 hours in cow) followed by the rest of period of anoestrous or passive. During oestrous, the female receives the male for copulation. During anoestrus, the female becomes passive and does not receive the male. Although the breakdown of tissues takes place in the female reproductive tract at the end of an oestrous cycle, yet there is no menstruation.

Correct Option:
B

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