Prelims Marathon – Science – October 26th – 2023

The term “amniocentesis” is often seen in news related to?

Which of the following is/are characteristic/s of the law of dominance of Mendel?
1.Characters are controlled by discrete units called factors.
2.Factors occur in pairs.
3.In a dissimilar pair of factors one member of the pair dominates the other.
How many of the statements given above are correct?

Consider the following statements:
1.Mutation is a phenomenon which results in alteration of DNA sequences.
2.Mutation results in changes in the genotype and the phenotype of an organism.
Which of the statements given above is/are correct?

“The inheritance of a particular trait is represented in the family tree over generations” – related to?

Consider the following statements regarding sickle cell anaemia:
1.It is an autosome linked recessive trait.
2.It can be transmitted from parents to the offspring when both the partners are carrier for the gene.
Which of the statements given above is/are correct?

Consider the following statements regarding Down’s syndrome:
1.The cause of this genetic disorder is the presence of an additional copy of the chromosome number 18.
2.It was first described by Langdon Down.
Which of the statements given above is/are correct?

Consider the following statements:
1.Detritivores break down detritus into smaller particles.
2.By the process of leaching, water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts.
Which of the statements given above is/are correct?

Consider the following statements:
1.Humification leads to accumulation of a dark colored amorphous substance called humus.
2.The humus is degraded by some microbes and the release of inorganic nutrients occurs by the process known as mineralization.
Which of the statements given above is/are correct?

Consider the following statements:
1.The gradual and fairly predictable change in the species composition of a given area is called ecological succession.
2.The entire sequence of communities that successively change in each area are called sere(s).
Which of the statements given above is/are correct?