CBSE 12 Biology Question Paper-2024 Set-1

In which of the following plants are both male and female flowers born on the same plant and the mode of pollination can be geitonogamy or xenogamy?

Which one of the following hormones is secreted by the human placenta that helps in the maintenance of pregnancy?

A schematic polynucleotide chain shows the dotted line '----' which represents the type of bond between the phosphate group and the sugar molecule, what is the name of this bond?

Select the option that has the correct sequence of events of human female reproductive cycle : (i) Secretion of FSH (ii) Ovulation (iii) Growth of corpus luteum (iv) Growth of follicle and oogenesis (v) Sudden increase in LH

Lactobacillus that sets curd from milk is commonly categorised in this group :

The specific Bt toxin genes that provide protection to cotton plants against cotton bollworm are the genes :

Refer to the Venn diagram given below. Select the option with correct examples P, Q, and R:

Which of the following transgenic animals has been used for safety testing of polio vaccine?

The statement: "embryos of all vertebrates including humans develop a series of vestigial gill slits just behind the head but it is a functional organ only in fishes and is replaced by lungs in all other vertebrates." was proposed by:

The type of bond represented by the dotted line '----' in a schematic polynucleotide chain is : S-----B P S-----B P S-----B P S-----B P

What is the specific name of the group of amino acids shown below and what is the chemical bond linking them?

The specific Bt toxin genes that provide protection to cotton plants against cotton bollworm are the genes :

Which of the following transgenic animals has been used for safety testing of polio vaccine?

The statement: "embryos of all vertebrates including humans develop a series of vestigial gill slits just behind the head but it is a functional organ only in fishes and is replaced by lungs in all other vertebrates." was proposed by:

A DNA sequence is given below : 3'-A-T-G-C-C-C-A-T-A-C-A-A-G-T-T-T-T-A-G-5'. What will be the sequence of the coding strand of DNA?

During the process of decomposition, the process by which inorganic nutrients are released from the degraded organic matter is called

When does the oocyte complete its meiotic division in humans?

From the following, select the sexually transmitted disease that can be completely cured if detected early and treated properly :

The type of speciation where populations living in different geographical areas develop into different species is called

Which of the following is an example of an incomplete dominant inheritance pattern?