BIO 101 | Study Mode

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Question 341
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 342
A
the ability to survive during adverse physical conditions
B
the ability to live for some time without ingesting food
C
protection from parasites and predators
D
the chance to get rid of accumulated waste products
Explanation
Amoeba forms a cyst and reproduces by ; multiple fission, during adverse environmental conditions. <br />The animal secretes a three-layered, protective, chitinous cyst around it and becomes inactive. Inside the cyst, the nucleus repeatedly divides to form several daughter nuclei, which arrange themselves near the periphery. Each daughter nucleus becomes enveloped by a small amount of cytoplasm, thus forming a daughter amoeba, called amoebula or pseudopodiospore. <br />When favourable conditions arrive, the cyst breaks off liberating the young pseudopodiospores, each with fine pseudopodia. They feed and grow rapidly to become adults and lead an independent life.

Correct option: A
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Question 343
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 344
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 345
A
Ventral central Leech nervous system
B
Pharyngeal gill slits Chamaeleon absent in embryo
C
Ventral heart Scorpion
D
Post-anal tail Octopus.
Explanation
The animals mentioned in the options are invertebrates. These invertebrates have central nervous system and dorsal heart. They lack pharyngeal slits and post anal tail.

Correct option: A
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Question 346
A
(ii), (iii) and (iv)
B
(b) only (i) and (iv)
C
only (i) and (ii)
D
(i), (iii) and (iv).
Explanation
Reptiles have two auricles and a partly divided ventricle except crocodiles which have four-chambered heart. Obelia shows metagenesis i.e. alternation of generations which may be defined as a phenomenon in which diploid asexual phase alternates with haploid sexual phase. Lemur has a thecodent teeth i.e., the teeth are embedded in the sockets of the jaw bone.

Correct option: D
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Question 347
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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Question 348
A
prawn has two pairs of antennae.
B
nematocysts are characteristics of the phylum cnidaria.
C
millepedes have two pairs of appendages in each segment of the body.
D
animals belonging to phylum porifera are marine and fresh water.
Explanation
Prawn has one pair of antennae, one on either side, just below the antennules. They are sensory, excretory and balancing in function. Antennules are attached on either side, below the bases of eye stalks. They are tactile in function. Nematocysts are present in cnidoblasts that act as organs of offence and defence. Millipedes belong to class myriapoda. <br />They are called thousand leggers because of possession of numerous walking legs. Body is made up of small head and 40 trunk segments, each with two pairs of jointed legs. Animals belonging to phylum porifera are mostly marine and a few are freshwater.

Correct option: A
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Question 349
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 350
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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