BIO 101 | Study Mode

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Question 341
A
porifera Spongilla, Eupleciella, Pennatula
B
cnidaria Bonellia, Physalia, Aurelia
C
platyhelminthes Planaria, Schistosoma, Enterobius
D
mollusca Loligo, Teredo, Octopus
Explanation
Mollusca includes those animals which have soft bodies, usually furnished with a shell. The body is often divided into a head, with eyes or tentacles, a muscular foot and a visceral mass housing the organs. Loligo (squid or sea arrow), Teredo (shipworm), Octopus are some of their examples. <br />In option (a) Spongilla and Euplectella belong to porifera but Pennatula (the sea pen or sea feather) belongs to coelenterata. In option (b) Physalia and Aurelia belong to cnidaria but Bonellia belongs to phylum annelida. In option (c) Planaria and Schistosoma belong to platyhelminthes but Enterobius (Pinworm) belongs to aschelminthes.

Correct option: D
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Question 342
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 343
A
arctic tern
B
salmon
C
Siberian crane
D
salamander
Explanation
Migration is the seasonal movement of complete populations of animals to a more favourable environment. It is common in mammals (e.g. porpoises), fish (e.g. eels and salmon) and some insects but is most marked in birds. The arctic tern, for example, migrates annually from its breeding ground in the Arctic Circle to the Antarctic. Salmon usually migrate from marine to fresh water to spawn. <br />The Siberian crane, breeds in arctic Russia in Ykutia and western Siberia. It is a long distant migrant. Salamander is an amphibian with slender body, short legs and long tail. Outside the breeding season they are seldom seen as they spend most of their time underground.

Correct option: D
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Question 344
A
Peripatus
B
king crab
C
Sphenodon
D
Archaeopteryx
Explanation
Living fossil is a term for any living species (or clade) of organism which closely resembles species otherwise only known from fossils and has no close living relatives. These species have all survived major extinction events, and generally retain low taxonomic diversities. Some examples of living fossils in animals are coelocanth, coral (polyp), crocodylia(crocodiles, gavials and alligators), horseshoe crab (Limulus polyphemus), monotremes (the Platypus and echidnas), snout-nosed frog (Nasikabatrachus sahyadrensis). <br />Archaeopteryx is the earliest and most primitive known bird to date. It lived in the Jurassic Period around 150- 155 million years ago. It has feathers and wings but it also had teeth and a skeleton similar to a small carnivorous dinosaur, therefore, it had both bird and theropod dinosour features. Archaeopteryx is a powerful piece of evidence that shows that birds have evolved from dinosaurs.

Correct option: D
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Question 345
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 346
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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Question 347
A
Hydra and starfish
B
starfish and sea anemone
C
Ctenoplana and Beroe
D
Aurelia and Paramecium
Explanation
Ctenophora is a small phylum of exclusively marine, invertebrate animals. Ctenoplana and Beroe are examples of ctenophora. They have biradial symmetry (a combination of radial and bilateral symmetries). They lack the specialized stinging cells (nematocystsl 1 found in coelenterates. but one species (Haeckelia rubra) incorporates those of its jellyfish prey for its own defense.

Correct option: C
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Question 348
A
ammonotelic when plenty of water is available
B
ureotelic when plenty of water is available
C
uricotelic when plenty of water is available
D
uricotelic under conditions of water scarcity
Explanation
Earthworm has excretory organ called nephridia. Ammonia is the chief excretory waste when water is available and hence it is ammonotelic in water and terrestrial earthworm is ureotelic.

Correct option: A
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Question 349
A
they all possess dorsal heart
B
none of them is aquatic
C
they all belong to the same phylum
D
they all have jointed paired appendages.
Explanation
Nereis, scorpion, cockroach and silver fish are all invertebrates and thus possess dorsal heart. Nereis is a marine animal while other animals mentioned in the question are terrestrial. Nereis belongs to phylum annelida while rests of the animals belong to phylum arthropoda. Jointed appendages are present in scorpion, cockroach and silver fish.

Correct option: A
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Question 350
A
toothless jaws
B
functional post-anal tail
C
ovoparity
D
homoiothermy.
Explanation
Homoiothermy is the maintenance by an animal of its internal body temperature at a relatively constant value by using metabolic processes to counteract fluctuations in the temperature of the environment. Homoiothermy occurs in birds and mammals, which are described as endotherms. <br />The heat produced by their tissue metabolism and the heat lost to the environment are balanced by various means to keep body temperature constant: 36-38C in mammals and 38-40C in birds. The hypothalamus in the brain monitors blood temperature and controls thermoregulation by both nervous and hormonal means. Thus parrot (bird) and platypus and kangaroo (mammals) are homoiothermic animals.

Correct option: D

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