List of top Questions asked in CBSE CLASS XII

Study the graph given below that represents the changes in the thickening of the uterine wall in women ‘X’ and women ‘Y’ over a period of one month:
What does the graph with respect to women ‘X’ and woman ‘Y’ indicate? Give a suitable reason.

Name any two hotspots in India.

Differentiate between grazing food chain and detritus food chain.

Explain Brood parasitism with the help of a suitable example.

Draw a well-labelled diagram of the sectional view of a male gametophyte/microspore of an angiosperm and write the functions of any two parts labelled. (Any four labels).

Name the group of drugs whose skeletal molecule is shown below:

Assertion (A): Plasmids are autonomously replicating circular extra-chromosomal DNA.
Reason (R): Plasmids are usually present in eukaryotic cells.

Assertion (A): Patents are granted by governments to an inventor.
Reason (R): Patents prevent others from commercial use of an invention.

Assertion (A): A given fig species can be pollinated only by its partner wasp.
Reason (R): The wasp pollinates the fig inflorescence while searching for suitable egg-laying sites.

What is artificial insemination in ART? Under what conditions is the person medically advised to go for it?

Why does a patient of ADA-deficiency require repeated infusions of genetically engineered lymphocytes? Suggest a possible permanent remedy.

Identify the category of genetic disorder depicted in the pedigree chart given below:

ELISA technique is based on the principle of:

Homologous organs indicate:

The ‘molecular scissors’ fall in the category of:

Which of the chromosome in a human possesses the least number of genes?

In a fertilized ovule of an angiosperm, the cells in which n, 2n, and 3n conditions respectively occur are:

Turner’s syndrome in humans occurs due to:

Which of the options has correct identification of ‘P’, ‘Q’, and ‘R’ in the illustration of ‘Central Dogma’ given below?

Study the following diagram of Transverse Section of a young anther of an angiosperm:
Select the option where parts ‘A’, ‘B’ and ‘C’ are correctly identified.

Select the option that gives the correct identification of ovum, morula, and blastocyst in a human female reproduction system as shown in the following diagram:

If \[ \begin{bmatrix} x + y & 2 \\ 5 & xy \end{bmatrix} = \begin{bmatrix} 6 & 2 \\ 5 & 8 \end{bmatrix}, \] then the value of \[ \left(\frac{24}{x} + \frac{24}{y}\right) \] is:

Abhay, Bikram, and Chris were partners in a firm sharing profits and losses equally. They decided to dissolve their partnership firm on 31^st March, 2023. The firm’s Balance Sheet on the date of dissolution was as follows: \[ \begin{array}{|c|c|c|c|} \hline \textbf{Liabilities} & \textbf{Amount (₹)} & \textbf{Assets} & \textbf{Amount (₹)} \\ \hline \text{Capital:} & & \text{Plant and Machinery} & 80,000 \\ \text{Abhay} & 68,000 & \text{Furniture} & 45,000 \\ \text{Bikram} & 1,00,000 & \text{Motor Car} & 1,25,000 \\ \text{Chris} & 77,000 & \text{Stock} & 30,000 \\ \text{Creditors} & 1,20,000 & \text{Debtors} & 70,000 \\ & & \text{Cash at Bank} & 15,000 \\ \hline \textbf{Total} & 3,65,000 & \textbf{Total} & 3,65,000 \\ \hline \end{array} \] Adjustments:

• Plant and Machinery was taken over by Abhay at an agreed valuation of ₹ 75,000.
• Furniture realised ₹ 40,000.
• Motor Car was taken over by Bikram for ₹ 1,30,000.
• Debtors realised 10% less than their book value.
• 10% of the stock was taken over by Chris for ₹ 4,500. The remaining stock was sold for ₹ 30,000.
• Realisation expenses amounted to ₹ 5,000.

............. indicate the speed at which activities of the business are being performed.