Class 12 Biology questions for CBSE

In agriculture, which of the following is an example of using biofertilizers?

A genetic study of a population reveals a 1:1 ratio of males to females. What can be inferred about the sex determination mechanism in this population?

In a case of incomplete dominance, what phenotype is expected in the F1 generation when red and white flowers are crossed?

A family has a history of cystic fibrosis. What type of genetic disorder does this represent?

In humans, which pair of sex chromosomes determines a male individual?

In the lac operon model, what role does the presence of lactose play in gene expression?

During the process of transcription, what is the role of RNA polymerase in relation to the DNA template?

A scientist is studying the double helix structure of DNA. Which of the following components is NOT part of the DNA structure?

In a specific food web, if the population of primary consumers decreases, what is the likely consequence for the producers?

In a forest ecosystem, which of the following components plays a crucial role in nutrient cycling?

In an ecological study, the biomass of primary producers was found to be significantly higher compared to primary consumers. What does this indicate about the energy flow in the ecosystem?

During an outbreak of malaria in a region, which of the following pathogens is responsible for the disease?

A 45-year-old individual has been diagnosed with lung cancer due to prolonged smoking. What is the primary risk factor associated with this type of cancer?

A patient presents with symptoms of a respiratory infection caused by a virus. Which of the following pathogens is most likely responsible?

Explain the significance of industrial microbiology in modern biotechnology. Discuss its applications in food production, waste management, and pharmaceutical industries, providing specific examples of microbial processes and products used in these sectors.

Discuss the various components of an ecosystem, including the roles of producers, consumers, and decomposers. How do these components interact to maintain ecological balance? Provide examples to support your explanation.

Describe the role of microbes in the production of antibiotics and their significance in industrial microbiology.

In a dihybrid cross, what phenotypic ratio is expected in the F2 generation according to Mendelian inheritance principles?

Which of the following codons codes for the amino acid Methionine?

What blood group is considered the universal donor?