Biology Questions for CBSE Class 12 Half-Yearly Exam 2028 (Top 50)
In the realm of botanical terminology, the male reproductive parts of a flower, collectively known as the androecium, play a crucial role in pollination and seed production.
Moving on to the world of genetics, human gamete mother cells undergo meiotic divisions, maintaining their diploid state. This process is essential for the creation of genetic diversity in offspring.
In a cross between pea plants with round green seeds and wrinkled yellow seeds, 25% of eggs will carry both the round and green alleles for the F2 generation. This illustrates the principles of genetic inheritance at work.
Deforestation, a significant environmental concern, leads to a decline in carbon sink, contributing to global warming.
In the animal kingdom, the larvae of insects such as the African midge demonstrate an incredible response to abiotic stress known as suspension. These creatures can revive when immersed in water even after a few years, showcasing their remarkable adaptability.
Amniocentesis, a medical procedure used to detect genetic disorders in the developing foetus, was banned in India around 1994 under the Pre-Conception and Prenatal Diagnostic Techniques Act. Despite the ban, amniocentesis remains important for the detection of genetic disorders.
In the realm of ecology, biodiversity encompasses a wide range of life forms, including animals, microorganisms present in the intestine of an organism, and cells from the same tissue in different organisms.
The process of eutrophication involves an increase in nutrient levels, a decrease in dissolved oxygen, a decrease in penetration of sunlight into water, and a decrease in the growth of algae and aquatic plants. This can have detrimental effects on the health of water bodies.
In a food web, the amount of energy available to organisms such as snakes cannot be determined without knowing their position in the chain. Producers, such as plants, provide the initial energy source, with this energy decreasing as it moves up the food chain.
Reproduction in organisms must involve the fusion of gametes, and heterogametes can be formed from two parents.
The colour of the colonies formed by variant P will not form any colonies, indicating a mutation that affects its ability to grow and reproduce.
In the field of biotechnology, recombinant DNA is made in prophase 1 of meiosis, a critical phase in cell division. The polymerase chain reaction (PCR) mimics the natural process of replication, facilitating the rapid amplification of DNA.
Genetic variation occurs in various ways, including mutation in liver cells, development of a zygote to an embryo, and gene flow from one population to another. Greater variation increases the chances of survival in a stable habitat.
In mice, brown fur is dominant and white fur is recessive. If a biologist crossed a brown fur male with a white fur female and obtained two brown fur and two white fur offspring, it is most likely that both parents are heterozygous.
In a reproductively unhealthy society, an increase in the infant mortality rate is often observed. This is a concerning indicator of societal issues that impact the wellbeing of newborns.
Lastly, it's worth noting that the questions in this article were developed by a team of subject experts, ensuring accuracy and precision in the information presented. Steam in a bioprocessor maintains sterility, a crucial aspect in many scientific and medical processes. The alleles coding for kernel colour in wheat exhibit polygenic inheritance, meaning that the trait is controlled by multiple genes.
This brief exploration into various scientific and biological topics offers a glimpse into the fascinating world around us, highlighting the intricate connections and processes that govern life on Earth.
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