CBSE 12 Biology Question Paper-2024 Set-3

The part of the ovule that develops into protective coats of a seed after fertilization in a typical flowering plant is:

A DNA fragment has 2000 nucleotides, out of which 140 are Adenine. How many bases does this DNA segment possess that have triple hydrogen bonds between them?

The ploidy of the apomictic embryos developing from the integument cells and synergids respectively would be :

A DNA fragment has 2500 nucleotides, out of which 240 are Guanine. How many bases having double hydrogen bonds between them does this DNA fragment possess?

Embryo formation without fertilization is observed in some species of :

The origin of life according to the early Greek philosophers was transfer of unit of life from outer space to the different planets in the form of:

Which of the following chromosomal disorders results in a person with short stature, small head, furrowed tongue and a partially open mouth?

The system of producing seeds without fertilization has developed in flowering plants of the family :

S.L. Miller in 1953 created conditions in a closed flask in support of chemical evolution that included:

The ploidy of the apomictic embryos developing from nucellus and antipodal cells respectively would be :

In Snapdragon, a cross between a plant with pink flowers and a plant with white flowers was performed. The expected percentage of phenotypes in the progeny would be:

Which of the following chromosomal disorder has a person with a tall stature with feminine characters?

Louis Pasteur refuted the theory of spontaneous generation by his experiments. For this he used pre-sterilized flask and :

Due to the effect of natural selection during pre-industrialisation era in England, the population of dark-winged moths as compared to white-winged moths was:

Due to the effect of natural selection during post-industrialisation era in England, the population of dark-winged moths as compared to white-winged moths was:

What is the expected phenotypic ratio of the progeny when a heterozygous tall plant of pea is crossed with a dwarf plant?

Which of the following is not required for PCR?

Due to the effect of natural selection during post-industrialisation era in England, the population of dark-winged moths as compared to white-winged moths was:

What is the expected percentage of phenotypes in the progeny when a plant with pink flowers is crossed with a plant with white flowers in Snapdragon?

Which of the following chromosomal disorder has a person with a tall stature with feminine characters?