List of top Questions asked in CBSE CLASS XII

Babita’s share in profit will be:
The amount of interest on capital allowed to Abha will be:
Alex, Benn, and Cole were partners in a firm sharing profits and losses in the ratio of 5 : 3 : 2. They admitted Dona as a new partner for $\frac{1{5}$ share in the future profits. Dona agreed to contribute proportionate capital. On the date of admission, capitals of Alex, Benn, and Cole after all adjustments were \rupee1,20,000; \rupee80,000; and \rupee1,00,000, respectively. The amount of capital brought in by Dona will be:}
Alfa Ltd. invited applications for 50,000 equity shares of \rupee10 each at a premium of 30\%. The whole amount was payable on application. Applications were received for 2,50,000 shares. The company decided to allot the shares on a pro-rata basis to all the applicants. The amount refunded by the company was:
Assertion (A): Each partner is a principal as well as an agent for all the other partners. Reason (R): As per the definition of the Partnership Act, partnership business may be carried on by all the partners or any of them acting for all. Choose the correct option from the following:
Atul, Beena, and Sita were partners in a firm sharing profits and losses in the ratio of 8 : 7 : 5. Damini was admitted as a new partner for $\frac{1{5}$ share in the profits, which she acquired entirely from Atul. The new profit-sharing ratio after Damini’s admission will be:}
Abhay, Boris, and Chetan were partners in a firm sharing profits in the ratio of 5 : 3 : 2. Boris was guaranteed a profit of \rupee95,000. Any deficiency on account of this was to be borne by Abhay and Chetan equally. The firm earned a profit of \rupee2,00,000 for the year ended 31\textsuperscript{st March, 2023. The amount given by Abhay to Boris as guaranteed amount will be:}

Study the table given below:

\[ \begin{array}{|l|l|} \hline \textbf{Contraceptive/Contraceptive Method} & \textbf{Mode of Action} \\ \hline \text{A. The pill} & \text{III. Inhibits ovulation} \\ \text{B. Condom} & \text{I. Prevent sperm reaching cervix} \\ \text{C. Vasectomy} & \text{IV. Semen contains no sperm} \\ \text{D. Copper-T} & \text{II. Prevent implantation} \\ \hline \end{array} \]

Select the option where contraceptive/contraceptive method are correctly matched with their mode of action.

Given below is a list of some commercially important products in column A, whereas in column B are names of source organisms:
\[ \begin{array}{|l|l|} \hline \textbf{Column A (Bioactive Products)} & \textbf{Column B (Source Organisms)} \\ \hline A. \text{Cyclosporin – A} & i. \text{Streptococcus} \\ B. \text{Statins} & ii. \text{Trichoderma polysporum} \\ C. \text{Streptokinase} & iii. \text{Penicillium notatum} \\ D. \text{Penicillin} & iv. \text{Monascus purpureus} \\ \hline \end{array} \]

Select the option where the product and their source organisms are correctly matched.
How do the following organisms act as bio-fertilizers? Explain.
(a) Mycorrhiza
(b) Anabaena
(c) Rhizobium
Explain the genetic basis that results in the expression of this disorder.
Identify the polarity from ‘X’ to ‘Y’ in the mRNA segment shown. Mention how many more amino acids can be added to the polypeptide that is being translated and why.
Describe the different steps in the sexual mode of reproduction in the life cycle of a malarial parasite from the time of its initiation till where it is completed and ready to start a fresh cycle.}
Write the initiating codon for translation, its anticodon, and the amino acid it codes for.
Work out a cross to explain how normal parents may have a sickle-cell anaemic child.
Why is sickle-cell anaemia, a human blood disorder, so named?
Explain the charging of an adaptor molecule. Why does this molecule need to be charged?
Growth curve ‘B’ shows a different pattern from that of growth curve ‘A’. Justify giving one reason.
Which one of the two curves is more “realistic” and why?
Describe the life cycle of HIV from the time of its entry into the human body till full-blown AIDS sets in.
Why does endosperm development precede embryo development in angiosperm seeds? State the role of endosperm in mature albuminous seeds.
Draw a labelled diagram showing the different embryonic stages of a dicot plant, up to a fully mature embryo.
Write the symptoms of malaria in humans and explain what causes these symptoms.
Which of the two curves is relevant in present days with respect to human population in our country and why?
‘A proper understanding of the menstrual cycle can help immensely in family planning.’ Do you agree with the statement? Provide reasons for your answer.