The Mesozoic era (spanning about 252 to 66 million years ago) is known as the 'Age of Reptiles' because of the dominance and diversification of dinosaurs, pterosaurs, and marine reptiles during this time. The Paleozoic is the age of invertebrates/fishes, Proterozoic is the early life era, and Cenozoic is the age of mammals.
Q2mcq
In embryo transfer technique, __________ celled blastomere is transferred into the uterus.
a.
more than 5
b.
more than 8
Correct Answer
c.
less than 5
d.
less than 8
Step-by-Step AI Explanation
Verified Method
In assisted reproductive technologies like In-Vitro Fertilization (IVF) and Embryo Transfer (ET), embryos with more than 8 cells (specifically the blastocyst stage or sometimes the 8-cell stage, but generally referred to as the 8-cell or more stage in specific curricula) are transferred into the uterus to ensure successful implantation.
Q3mcq
Which of the following is the correct sequence of event with reference to the central dogma ?
The central dogma of molecular biology states that genetic information flows from DNA to RNA to Protein. Replication involves copying DNA, Transcription involves synthesis of RNA from DNA, and Translation involves protein synthesis from RNA.
Q4mcq
The process which the sperm undergoes before penetrating the ovum is :
a.
Spermiogenesis
b.
Spermiation
c.
Capacitation
Correct Answer
d.
Cortical reaction
Step-by-Step AI Explanation
Verified Method
Capacitation is the physiological maturation process that spermatozoa undergo in the female reproductive tract before they are capable of penetrating the ovum. Spermiogenesis is the transformation of spermatids to spermatozoa, Spermiation is the release of sperm into the lumen, and the Cortical reaction happens after fertilization.
Q5mcq
According to Alexander Von Humboldt, species - area relationship is $\log S = \log C + Z \log A$, where ‘Z’ is :
a.
Y-intercept
b.
Species richness
c.
Slope of the line
Correct Answer
d.
Area
Step-by-Step AI Explanation
Verified Method
In the equation $\log S = \log C + Z \log A$, 'S' is species richness, 'A' is area, 'C' is the y-intercept, and 'Z' represents the regression coefficient, which corresponds to the slope of the line.
Q6mcq
Animals that can move from freshwater to seawater is called as :
a.
Catadromous
Correct Answer
b.
Stenothermal
c.
Anadromous
d.
Eurythermal
Step-by-Step AI Explanation
Verified Method
Catadromous animals are those that migrate from freshwater to seawater to spawn. Anadromous animals move from seawater to freshwater. Stenothermal and Eurythermal refer to tolerance to temperature ranges, not migratory habits related to water salinity.
Q7mcq
Allergy involves :
a.
IgA
b.
IgE
Correct Answer
c.
IgM
d.
IgG
Step-by-Step AI Explanation
Verified Method
Allergic reactions are triggered by allergens that stimulate the production of Immunoglobulin E (IgE) antibodies. These antibodies bind to mast cells and basophils, causing the release of histamines and other chemicals that result in allergic symptoms.
Q8mcq
The mode of reproduction in bacteria is by :
a.
Conjugation
Correct Answer
b.
Formation of gametes
c.
Zoospore formation
d.
Endospore formation
Step-by-Step AI Explanation
Verified Method
Conjugation is a method of bacterial genetic recombination and reproduction where DNA is transferred from one bacterium to another. While endospores are survival structures, they are not a primary mode of reproduction. Bacteria primarily reproduce through binary fission, but among the choices provided, conjugation is the mechanism associated with genetic exchange and reproductive diversity.
Q9mcq
XO type of sex determination and XY type of sex determination are examples of :
a.
Male heterogamety
Correct Answer
b.
Female heterogamety
c.
Male homogamety
d.
Both (b) and (c)
Step-by-Step AI Explanation
Verified Method
In both XO and XY types of sex determination, the male individual produces two different types of gametes (heterogametic), one carrying an X chromosome and another either lacking it (O) or carrying a Y chromosome. Therefore, these are examples of male heterogamety.
Q10mcq
Who proposed the ‘Germplasm theory’ ?
a.
Lamarck
b.
Darwin
c.
Alfred Wallace
d.
August Weismann
Correct Answer
Step-by-Step AI Explanation
Verified Method
August Weismann proposed the Germplasm theory, which states that inheritance is passed through germ cells (somatic vs. germ plasm), thereby refuting the inheritance of acquired characters.
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(a)Describe the structure of the human ovum with a neat labelled diagram. OR (b)What is the technique which is used in the identification of criminals ? Give its other applications.
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