In which type of Parthenogenesis are only males produced?
a.
Arrhenotoky
Correct Answer
b.
Thelytoky
c.
Amphitoky
d.
Both (a) and (c)
Step-by-Step AI Explanation
Verified Method
Arrhenotoky is the type of parthenogenesis in which only males are produced, usually from unfertilized eggs. In thelytoky, only females are produced. Amphitoky can produce both sexes depending on conditions. Therefore, the correct choice is (a) Arrhenotoky.
Q2mcq1 mark
Statement I : Castration (or) surgical removal of testis is known as Orchidectomy.
Statement II : It leads to difficulty in urination.
a.
Statement I and Statement II are not correct.
b.
Statement I and II are correct.
c.
Statement I is not correct and Statement II is correct.
d.
Statement I is correct and Statement II is not correct.
Correct Answer
Step-by-Step AI Explanation
Verified Method
Statement I is correct: surgical removal of the testes is called orchidectomy. Statement II is not correct: orchidectomy does not lead to difficulty in urination; it mainly affects male reproductive functions and hormone production. Therefore, the correct answer is (d) Statement I is correct and Statement II is not correct.
Q3mcq1 mark
Select the incorrect action of hormonal contraceptive pills from the following.
a.
Changes in cervical mucus impairing its ability to allow passage and transport of sperms
b.
Inhibition of spermatogenesis
Correct Answer
c.
Alteration in uterine endometrium to make it unsuitable for implantation
d.
Inhibition of ovulation
Step-by-Step AI Explanation
Verified Method
Hormonal contraceptive pills work mainly by inhibiting ovulation, altering the uterine endometrium, and changing cervical mucus so sperm passage is difficult. They do not inhibit spermatogenesis, because spermatogenesis occurs in males, not in users of these pills. Hence, the incorrect action is (b) Inhibition of spermatogenesis.
Q4mcq1 mark
This pedigree symbol represents :
a.
Male
b.
Monozygotic twins
c.
Mating
d.
Dizygotic twins
Correct Answer
Step-by-Step AI Explanation
Verified Method
The given pedigree symbol represents dizygotic twins. In pedigree charts, monozygotic twins are usually shown by twin lines with an additional connecting line between them, while dizygotic twins are shown as two branches from the same point without that connecting line. Therefore, the correct answer is (d) Dizygotic twins.
Q5mcq1 mark
Hershey and Chase’s experiment with bacteriophage showed that :
a.
DNA contains radioactive sulphur.
b.
Protein gets into the bacterial cells.
c.
Viruses undergo transformation.
d.
DNA is the genetic material.
Correct Answer
Step-by-Step AI Explanation
Verified Method
Hershey and Chase’s bacteriophage experiment proved that DNA is the genetic material. They used radioactive phosphorus to label DNA and radioactive sulphur to label protein, and found that only DNA entered the bacterial cell and directed formation of new phages. Thus, the correct answer is (d) DNA is the genetic material.
Q6mcq1 mark
Find out the wrongly matched pair.
a.
Y-chromosome - 231 genes
b.
Chromosome-1 - 2968 genes
c.
Dystrophin - 2.4 million bases
d.
Human genome - 300 bases
Correct Answer
Step-by-Step AI Explanation
Verified Method
The wrongly matched pair is (d) Human genome - 300 bases. The human genome is made up of about 3.2 billion base pairs, not 300 bases. The other pairs are acceptable matches: Y-chromosome has 231 genes, chromosome 1 has 2968 genes, and dystrophin gene is about 2.4 million bases long.
Q7mcq1 mark
The wings of birds and butterflies is an example of :
a.
Divergent evolution
b.
Adaptive radiation
c.
Variation
d.
Convergent evolution
Correct Answer
Step-by-Step AI Explanation
Verified Method
Wings of birds and butterflies are an example of convergent evolution. They perform the same function, i.e., flight, but have different origin and structure. Such analogous organs arise due to similar environmental pressures, not common ancestry. Therefore, the correct answer is (d) Convergent evolution.
Q8mcq1 mark
Which of the following groups of diseases have been controlled by the use of vaccines and by creating awareness among the people ?
a.
Small pox, amoebiasis, diphtheria, tetanus.
b.
Small pox, polio, diphtheria, tetanus.
Correct Answer
c.
Small pox, AIDS, diphtheria, tetanus.
d.
Small pox, common cold, diphtheria, tetanus.
Step-by-Step AI Explanation
Verified Method
Vaccination and public awareness have effectively controlled diseases such as smallpox, polio, diphtheria, and tetanus. Amoebiasis is not prevented by vaccines, AIDS has no widely used preventive vaccine, and common cold also has no vaccine-based control in routine public health practice. Hence, the correct answer is (b) Small pox, polio, diphtheria, tetanus.
Q9mcq1 mark
Allergy involves :
a.
IgA
b.
IgE
Correct Answer
c.
IgM
d.
IgG
Step-by-Step AI Explanation
Verified Method
Allergic reactions are mediated mainly by IgE antibodies. IgE binds to mast cells and basophils; when the allergen enters again, it triggers release of histamine and other mediators, causing allergy symptoms. IgA is mainly found in secretions, IgM is the first antibody produced in primary immune response, and IgG is the most abundant antibody in blood.
Q10mcq1 mark
The most common substrate used in distilleries for the production of ethanol is __________.
a.
Molasses
Correct Answer
b.
Soya meal
c.
Corn meal
d.
Groundgram
Step-by-Step AI Explanation
Verified Method
Molasses is the most common substrate used in distilleries for the production of ethanol. It is a cheap by-product of sugar industry and is rich in fermentable sugars, making it ideal for alcohol fermentation. Soya meal, corn meal and groundgram are not the usual standard substrates for industrial ethanol production.
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Assertion (A) : In nature many organisms produce clones through asexual reproduction.
Reason (R) : By this process, genetically identical individuals are produce
