BIO 101 | Study Mode

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Question 11
A
merozoite 
B
sporozoite 
C
trophozoite 
D
minuta form. 
Explanation.
The infective stage of Plasmodium is a minute organism called sporozoite. When the mosquito bites man, sporozoites present in the salivary gland of female Anopheles mosquito are injected into the blood of the man. These sporozoites are spindle-shaped or sickle- shaped uninucleate organisms capable of wrigging (wormlike) movements. Each sporozoite consists of elastic pellicle, cytoplasm and nucleus.

Correct Option:
B
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Question 12
A
micronucleus 
B
macronucleus 
C
both micronucleus and macronucleus 
D
mitochondria. 
Explanation.
Paramaecium contains a single large macronucleus and one small micronucleus. The macronucleus controls metabolism such as feeding and maintaenance, whereas the macronucleus takes and important role in reproduction and stores genetic information, hence it is also termed as reproductive nucleus whereas macronucleus is termed as vegetative nucleus.

Correct Option:
A
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Question 13
A
sarcodina 
B
ciliata 
C
sporozoa 
D
dinophyceae. 
Explanation.
These protozoans are adapted to parasitic mode of life. All of them are endoparasites. Locomotory organelles (cilia, flagella. pseudopodia, etc.) are absent. Organelles connected with ingestion are absent. Nutrition is parasitic (absorptive). Sexual reproduction takes place through syngamy. <br />It is followed by spore formation, hence sporozoans. Life cycle consists of two distinct asexual and sexual phases. They may be passed in one (monogenetic) or two different hosts (digenetic).

Correct Option:
C
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Question 14
A
mononomial 
B
vernacular 
C
binomial 
D
polynomial 
Explanation.
Binomial nomenclature is the formal system of naming species. The essence of it is that each species name is in (modern scientific) Latin and has two parts, so that it is also sometimes popularly known as the Latin name of the species, although this terminology is frowned upon by biologists, who prefer the phrase scientific name.

Correct Option:
C
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Question 15
A
species 
B
kingdom 
C
family 
D
variety. 
Explanation.
Basic unit or smallest taxon of taxonomy/ classification is species. Species is a group of individuals that remain relatively constant in their characteristics; can be distinguished from other species and do not normally interbreed.

Correct Option:
A
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Question 16
A
polymorphic 
B
monogenetic 
C
facultative parasite 
D
non-pathogenic. 
Explanation.
Trypanosoma is polymorphic i.e. it has more than one form. It has at least four forms that are recognized on the basis of the positions of kinetoplast and blepharoplast and the course taken by the tlagellum. Two or more such forms occur either in one or both the hosts in the life cycles of various species of Trypanosoma. These i forms are <br />(i) Leishmanial (amastigote): Round or oval form with a nucleus, blepharoplast and kinetoplast. Flagellum reduced and fibril-like embedded in cytoplasm. <br />(ii) Leptomonad (promastigote): Body elongate, nucleus large and anteriorly located blepharoplast and kinetoplast. Flagellum short and unattached. <br />(iii) Crithidial (epimastigote): Body elongate. Blepharoplast and kinetoplast placed immediately anterior to nucleus. Undulating membrane inconspicuous. <br />(iv) Trypanosomid (trypomastigote): Body elongate and slender. Blepharoplast and kinetoplast situated at or near posterior end. Undulating membrane conspicuous. <br />Tiypanosoma is digenetic i.e. it completes its life cycle in two hosts. It is an obligate parasite and is pathogenic. <br /> Tiypanosoma is digenetic i.e. it completes its life cycle in two hosts. It is an obligate parasite and is pathogenic.

Correct Option:
A
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Question 17
A
eating balanced food 
B
eating plenty of fruits 
C
drinking boiled water 
D
using mosquito nets. 
Explanation.
Amoebiasis can be prevented by drinking boiled water as it mainly occurs by ingestion of cysts of E. histolytica in food or drinks. The contamination of food or drinks occurs by (i) unhygienic habits of food handlers who by habit scratch the anus and then put the fingers in the food which they serve, (ii) habit of defecating in open fields causing contamination of vegetables and then washing the bottom in ponds causing the contamination of water, (iii) transmission of cysts from stools to food and drinks by flies and cockroaches. So, one should take following preventive measures: <br />(I) Proper sanitation of roads, streets, lanes and open drains. <br />(II) Purification of drinking water (by boiling). <br />(III) Proper disposal of sewage. <br />(IV) Covering of the food articles by the traders. <br />(V) Chemical trcatent of huma faeces to be used as fertilizer.

Correct Option:
C
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Question 18
A
a group of related families 
B
a group of related species 
C
a type of living organisms 
D
a taxonomic group of any ranking. 
Explanation.
The word taxon signify a taxonomic group of any rank which represents the real biological organisms included in a category. The term taxon was coined by Adolf Meyer (1926) for animals and H.J Lam (1948) used this term in plant Science.

Correct Option:
D
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Question 19
A
Ronald Ross 
B
Mendel 
C
Laveran 
D
Stephens. 
Explanation.
Laveran discovered that malaria is caused by protozoan parasite (Plasmodium) in 1880. He discovered Plasmodium and got Nobel Prize in 1907. <br />Sir Ronald Ross in 1897, a doctor in Indian Army, established that malaria parasite is transmitted by the bite of a female Anopheles mosquito and in 1902; he got Nobel Prize for this discovery.

Correct Option:
C
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Question 20
A
Plasmodium falciparum 
B
P. vivax 
C
P. ovale 
D
P. malariae. 
Explanation.
Plasmodium falciparum is the greatest killer of human beings over most parts of Africa and elsewhere in tropics. It causes malignant (or pernicious or cerebral or tropical) tertian malaria. <br />This malaria is most harmful. Plasmodium vivax causes benign tertian malaria. Plasmodium malariae causes quartan malaria. Plasmodium ovale is the rarest of the four species which infect man and it causes mild tertian malaria.

Correct Option:
A

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