List of practice Questions

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
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.}
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.
Write the initiating codon for translation, its anticodon, and the amino acid it codes for.
Explain the charging of an adaptor molecule. Why does this molecule need to be charged?
Why is sickle-cell anaemia, a human blood disorder, so named?
Explain the genetic basis that results in the expression of this disorder.
Work out a cross to explain how normal parents may have a sickle-cell anaemic child.
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?
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.
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.
Describe the life cycle of HIV from the time of its entry into the human body till full-blown AIDS sets in.
Write the symptoms of malaria in humans and explain what causes these symptoms.
Whose skulls ‘A’, ‘B’, and ‘C’ are shown below? Which of the two are more similar to each other?
Name the (i) ape-like (ii) man-like primates that existed 1.5 million years ago.
Name this RNA product transcribed from the DNA that subsequently translates into a polypeptide of 400 amino acids. Mention the enzyme responsible for transcribing this type of RNA from the DNA.
Name and explain the process the RNA molecule transcribed from 8000 nucleotide-long DNA undergoes to be able to translate a polypeptide of 400 amino acids.
Write the number of RNA polymerases involved in the transcription of DNA in a prokaryote and eukaryotes.
Identify the growth curves ‘A’ and ‘B’.