BIO 101 | Study Mode

Join Discuss Share to WhatsApp
Question 321
A
sponge 
B
earth-worm 
C
cockroach 
D
Hydra. 
Explanation.
Hydra which belongs to the phylum coelenterata has nerve cells but no brain. Its nervous system consists of nerve cells and their processes. Sensory cells are also present. Sponges do not have nerve cells, they lack nervous system. Earthworm (annelida) has nervous system consisting of a circumenteric nerve ring and a solid, double, midventral nerve cord with ganglia. Cockroach (arthropoda) has the nervous system as that of earthworm.

Correct Option:
D
Join Discuss Share to WhatsApp
Question 322
A
A and B 
B
A, B and C 
C
B and D 
D
C and D 
Explanation.
Silver fish is an insect in which respiration occurs by tracheae. These communicate with the exterior by paired apertures, called spiracles. Respiratory system of scorpion consists of 4 pairs of book lungs that communicate with the outer air through stigma. In sea squirt, respiration occurs through pharyngeal slits. In dolphin, respiration occurs by lungs.

Correct Option:
B
Join Discuss Share to WhatsApp
Question 323
A
Pherelima Sexual dimorphism 
B
Musca Complete metamorphosis 
C
Chameleon Mimicry 
D
Taenia Polymorphism 
Explanation.
In Musca, development is indirect with complete metamorphosis (holometaboly) including four stages as follows egg, larva, pupa and adult. <br />In complete metamorphosis, larva after hatching, moults several times to become a fully grown one. It later becomes a pupa within a secreted case, called the puparium. Pupa differentiates into the young adult that breaks the puparium open and emerges outside. Then it grows to a mature form.

Correct Option:
B
Join Discuss Share to WhatsApp
Question 324
A
cockroach 
B
frog 
C
humans 
D
sunflower 
Explanation.
In cockroach, the compound eyes are a pair of large, black, kidney-shaped organs situated dorsolateral on the head, one on either side. Their surface is marked by a large number of hexagonal areas, the facets. Each facet represents a visual unit named ommatidium. The eyes are the organs of sight (photoreception).

Correct Option:
A
Join Discuss Share to WhatsApp
Question 325
A
unicellular or acellular 
B
multicellular without any tissue organization 
C
multicellular with a gastrovascular system 
D
multicellular having tissue organization, but no body cavity (2003) 
Explanation.
Sycon, belonging to the phylum porifera, are multicellular organisms with cellular level of body organisation. The constituent cells perform their functions more or less independently. No distinct tissue or organs are present in it.

Correct Option:
B
Join Discuss Share to WhatsApp
Question 326
A
the heart that contracts under stimulation from nervous system 
B
left auricle and left ventricle in higher vertebrates 
C
entire heart in lower vertebrates 
D
the two ventricles together in humans 
Explanation.
Systemic heart refers to the entire heart of lower vertebrates. This heart pumps blood to body parts and not the lungs.

Correct Option:
C
Join Discuss Share to WhatsApp
Question 327
A
on the sides of the head of some amphibians 
B
at the reduced tail end of birds 
C
on either side of vagina in humans 
D
on either side of vas deferens in humans 
Explanation.
Bartholins glands are situated on either side of vagina in humans (females). These glands secrete a fluid that lubricates the vulva during copulation.

Correct Option:
C
Join Discuss Share to WhatsApp
Question 328
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
Join Discuss Share to WhatsApp
Question 329
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
Join Discuss Share to WhatsApp
Question 330
A
increase in number 
B
disappear 
C
increase in size 
D
decrease in size. 
Explanation.
Amoeba is a fresh water protozoan containing contractile vacuole that is meant for osmoregulation. <br />When Amoeba is placed in marine water, then the water from the contractile vacuole will move out resulting in decrease in size of it Contractile vacuole will increase in size if it is placed in hypotonic solution. Water will enter into contractile vacuole, thus increasing its size and ultimately it will burst and disappear.

Correct Option:
D

Try this quiz in in E-test/CBT Mode
switch to BIO 101 in CBT Mode

Previous Page Next Page
Question Map
Quiz link
Share BIO 101 with your audience
Share to WhatsApp CBT mode Study mode copy link

​​​sponsored

Are you a writer, proof-reader, interpreter, teacher, student or just someone who works in Yorùbá Language? 

 
Translate those figures and numbers to words in standard Yoruba Language at YorubaNumeral.com.ng at no cost. 
 
It also aids learning the yoruba numbering system by providing detailed explanation for each number translated up to 25 billion. 
 
English to Yorùbá Numeral Translator