CBSE 12 Biology Question Paper-2024 Set-2

The pyramid of biomass in sea is generally inverted because in sea :

Which one of the following is not used as a vector for rDNA technology?

Which one of the following pairs is not correctly matched ?

Allergic reactions are countered by the administration of :

Match the items in Column I with those in Column II and select the correctly matched option from those given below :
Column I Column II
Cross Phenotypic Ratio
1. Mendelian monohybrid (i) 1:2:1 (F2)
2. Mendelian dihybrid (ii) 1:1
3. Incomplete dominance (iii) 3:1(F2)
4. Test cross (monohybrid) (iv) 9:3:3:1(F2)

Homologous organs indicate :

A population is in genetic equilibrium/Hardy-Weinberg equilibrium for a gene with 2 alleles (dominant allele is 'A' and recessive allele 'a'). If the frequency of allele 'A' is 0.6, then the frequency of genotype 'Aa' is :

In the double helical structure of DNA molecule, the strands are:

In a 'transcription unit', the 'terminator' is located towards the:

The vector for dengue fever is:

An angiosperm embryo sac is located within the :

In humans, the secondary oocyte completes meiotic division when :

Which one of the following statements is not true?

A woman with normal vision has a colour blind father. She marries a man with normal vision. The percentage chance of their progeny being colour blind is :

Which of the following is not required for PCR?

Which one of the following option denotes mating between relatives in human pedigree analysis?

When a heterozygous tall plant of pea is crossed with a dwarf plant, the phenotypic ratio of tall and dwarf plants in the 60 progeny plants obtained will be:

A woman with normal vision has a colour blind father. She marries a man with normal vision. The percentage chance of their progeny being colour blind is :

Which one of the following statements is not true?