Radioactive wastes can be disposed off by __________.
a.
composting
b.
burning
c.
surface impoundments
d.
a deep geological repository
Correct Answer
Step-by-Step AI Explanation
Verified Method
Radioactive waste remains hazardous for thousands of years, making secure, long-term containment essential. A deep geological repository, located in stable rock formations deep underground, is the scientifically accepted method for isolating this waste. Composting, burning, and surface impoundments are unsuitable and dangerous for radioactive materials.
Q2mcq
In which mode of Reproduction variation are seen ?
a.
Asexual
b.
Parthenogenesis
c.
Sexual
Correct Answer
d.
Both (a) and (b)
Step-by-Step AI Explanation
Verified Method
Sexual reproduction involves the fusion of gametes from two parents, which leads to genetic recombination and independent assortment, resulting in variations among offspring. Asexual reproduction and parthenogenesis (a form of asexual reproduction) produce genetically identical clones, showing minimal to no variation.
Q3mcq
Which one of the following are at high risk extinction due to habitat destruction ?
a.
Amphibians
Correct Answer
b.
Mammals
c.
Echinoderms
d.
Birds
Step-by-Step AI Explanation
Verified Method
Amphibians are highly sensitive to changes in both aquatic and terrestrial environments (biphasic lifestyle). Due to their permeable skin and dependence on moist habitats, they are often considered bioindicators and are currently at the highest risk of extinction globally due to habitat destruction and pollution.
Q4mcq
When a Drosophila body cells contain 3 sets of autosomes and 2 X chromosomes, what will be the sex of the fly ?
a.
metamale
b.
male
c.
intersex
Correct Answer
d.
female
Step-by-Step AI Explanation
Verified Method
According to Bridges' Genic Balance Theory in Drosophila, sex is determined by the ratio of X chromosomes to sets of autosomes (X/A ratio). Here, $X = 2$ and $A = 3$, so the ratio is $2/3 \approx 0.67$. Ratios between 0.5 and 1.0 result in intersex individuals. Therefore, the fly will be an intersex.
Q5mcq
The total number of nitrogenous in human genome is estimated to be about __________.
a.
35 million
b.
3.5 million
c.
3.1 billion
Correct Answer
d.
35,000
Step-by-Step AI Explanation
Verified Method
The Human Genome Project determined that the human genome consists of approximately 3.1647 billion nucleotide base pairs. Thus, 3.1 billion is the correct estimate for the number of nitrogenous bases.
Q6mcq
A contraceptive pill prevents ovulation by :
a.
stimulating release of FSH and LH
b.
blocking fallopian tube
c.
causing immediate degeneration of released ovum
d.
inhibiting release of FSH and LH
Correct Answer
Step-by-Step AI Explanation
Verified Method
Contraceptive pills typically contain synthetic progesterone and estrogen. These hormones exert negative feedback on the pituitary gland, inhibiting the secretion of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). Without the surge of these hormones, ovulation does not occur.
Q7mcq
Organisms which can survive a wide range of temperature are called __________.
a.
Endotherms
b.
Ectotherms
c.
Stenotherms
d.
Eurytherms
Correct Answer
Step-by-Step AI Explanation
Verified Method
Eurytherms are organisms that can tolerate and thrive in a wide range of ambient temperatures. Stenotherms, in contrast, are restricted to a narrow range of temperatures. Endotherms and Ectotherms refer to how an organism regulates its internal body temperature, not the range of external temperatures they can tolerate.
Q8mcq
B - lymphocytes are activated by :
a.
Interferon
b.
Antibiotics
c.
Antigen
Correct Answer
d.
Antibody
Step-by-Step AI Explanation
Verified Method
B-lymphocytes are a critical part of the adaptive immune system. They recognize specific pathogens (antigens) through their surface receptors. Once they encounter and bind to a specific antigen, they become activated, proliferate, and differentiate into plasma cells that produce antibodies.
Q9mcq
The most common substrate used in distilleries for the production of ethanol is :
a.
Molasses
Correct Answer
b.
Soyameal
c.
Corn meal
d.
Groundgram
Step-by-Step AI Explanation
Verified Method
Molasses is the dark, viscous byproduct obtained after the extraction of sugar from sugarcane. It is rich in fermentable sugars (sucrose, glucose, and fructose), making it the most cost-effective and common substrate for ethanol fermentation by yeast. The other options are less efficient or not primarily used for large-scale ethanol production.
In male reproductive physiology, the Luteinizing Hormone (LH) acts on the Leydig cells (interstitial cells) in the testes. This stimulation induces the Leydig cells to produce testosterone, which is the primary hormone required for the process of spermatogenesis. Other options incorrectly associate the hormones with their targets or regulatory sequences.
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(a)Describe the structure of the human uterus with a neat labelled diagram. OR (b)What are the strategies to be implemented in India to attain total reproductive health ?
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(a)How does Hardy-Weinberg’s expression ($p^2 + 2pq + q^2 = 1$) explain that genetic equilibrium is maintained in a population ? List any four factors that can disturb the genetic equilibrium. OR (b)Explain any five bacterial disease.
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