Competition between species, specifically competitive exclusion, often leads to the extinction or local elimination of the weaker species if they compete for the same limited resource. Amensalism is a relationship where one is harmed and the other unaffected, Symbiosis is a close association, and Mutation is a genetic change; none are the direct primary consequence of interspecific competition.
Q2mcq
__________ is used to lower blood cholesterol level.
a.
Statins
Correct Answer
b.
Clot buster
c.
Tetracycline
d.
Cyclosporin A
Step-by-Step AI Explanation
Verified Method
Statins, produced by the yeast Monascus purpureus, act by competitively inhibiting the enzyme responsible for the synthesis of cholesterol. Clot busters (streptokinase) dissolve clots, Tetracycline is an antibiotic, and Cyclosporin A is an immunosuppressant.
Q3mcq
Which one of the following is true to gastrulation ?
a.
Formation of three germ layer embryo from single layer embryo.
Correct Answer
b.
Formation of multicellular structure from zygote.
c.
Attachment of blastocyst to the uterine wall.
d.
Formation of specific organs from Primary germ layers.
Step-by-Step AI Explanation
Verified Method
Gastrulation is the morphogenetic process during embryonic development where the single-layered blastula is reorganized into a trilaminar (three germ layers: ectoderm, mesoderm, and endoderm) structure called the gastrula.
Q4mcq
Which of the following Codon codes for methionine ?
a.
UUU
b.
AUG
Correct Answer
c.
AUC
d.
UAA
Step-by-Step AI Explanation
Verified Method
AUG is the universal start codon which codes for the amino acid methionine. UUU codes for phenylalanine, AUC codes for isoleucine, and UAA is a stop codon.
Q5mcq
ZW-ZZ system of sex determination occurs in :
a.
Reptiles
b.
Birds
c.
Fishes
d.
All of the above
Correct Answer
Step-by-Step AI Explanation
Verified Method
The ZW-ZZ system of sex determination is found in birds, some reptiles, and certain species of fish and butterflies. In this system, females are heterogametic (ZW) and males are homogametic (ZZ).
Q6mcq
The golden age of reptiles was :
a.
Paleozoic era
b.
Mesozoic era
Correct Answer
c.
Proterozoic era
d.
Cenozoic era
Step-by-Step AI Explanation
Verified Method
The Mesozoic era is widely known as the 'Age of Reptiles' because of the dominance of dinosaurs and other reptilian groups during this geological timeframe.
Q7mcq
__________ was the first human like being.
a.
Ramapithecus
Correct Answer
b.
Homo erectus
c.
Hominids
d.
Australopithecus
Step-by-Step AI Explanation
Verified Method
Ramapithecus is widely considered to be one of the earliest ancestors in the human lineage that exhibited some human-like characteristics, such as thick dental enamel and a jaw structure adapted for a varied diet, preceding Australopithecus.
Q8mcq
Animals that can move from Fresh water to Sea water :
a.
Catadromous
b.
Stenothermal
c.
Anadromous
Correct Answer
d.
Eurythermal
Step-by-Step AI Explanation
Verified Method
Anadromous fish are those that migrate from the sea into fresh water to spawn. Catadromous fish move in the opposite direction (from fresh water to sea water). Stenothermal/Eurythermal refers to temperature tolerance, not migration between water types.
Q9mcq
The first ejaculation of the semen is __________.
a.
Orchidectomy
b.
Infertility
c.
Spermarche
Correct Answer
d.
Azoospermia
Step-by-Step AI Explanation
Verified Method
Spermarche refers to the first ejaculation of semen containing sperm during puberty. Orchidectomy is the surgical removal of testes; Infertility is the inability to conceive; Azoospermia is the medical condition of having no measurable level of sperm in the semen.
Q10mcq
Exo-erythrocytic schizogony of Plasmodium takes place in :
a.
Stomach
b.
RBC
c.
Liver
Correct Answer
d.
Leucocytes
Step-by-Step AI Explanation
Verified Method
In the life cycle of Plasmodium, the sporozoites enter the human host through a mosquito bite and first infect the liver cells, where they undergo exo-erythrocytic schizogony before entering the RBCs (erythrocytic schizogony). Stomach is the site of sexual cycle in the mosquito.
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Mention the number of primers required in each cycle of PCR. Write the role of primers and DNA Polymerase in PCR. Name the source organism of the DNA Polymerase used in PCR.
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