KCET 2025 || Biology Practice Test || Exam Questions 21-30

21. Which of the following are the techniques for detection of cancer of internal organs?
(a) Radiography, MRI (b) MRI, computed tomography
(c) Widal test, radiography (d) MRI, widal test

(1)a and c (2)b and c (3)b and d (4) a and b

22. Malignant malaria is caused by

(1)Plasmodium vivax (2)Plasmodium falciparum (3)Plasmodium rubrum (4)Plasmodium malariae

23. The drug prescribed to the patients who have undergone organ transplant is ______ and is produced by ______.

(1)Stain, Monascus purpureus (2)Cyclosporin-A, Trichoderma polysporum (3)Statin, Trichoderma polysporum (4)Cyclosporin-A, Monascus purpureus

24. Read the following statements and select the correct option
Statement I: Biocontrol refers to the use of biological methods for controlling plant diseases and pests.
Statement II: Trichoderma species are effective biocontrol agents for several plant pathogens

(1)Both statement I and statement II are incorrect (2)Statement I is incorrect but statement II is correct (3)Both statement I and statement II are correct (4) Statement I is correct and statement II is incorrect

25. Match the column-I with Column-II. Choose the correct option given below.
Column-I                                Column-II
(a) Streptococcus                         i. Free living nitrogen fixing bacteria
(b) Penicillium                             ii. Clot buster
(c) Methanogens                           iii. Source of antibiotic
(d) Anabaena                               iv. Biogas production

(1)a – ii, b – iv, c – iii, d - i (2)a – iv, b – iii, c – I, d – ii (3)a – iv, b – I, c – iii, d – ii (4) a – ii, b – iii, c – iv, d - i

26. Match the contents of List-I with List-II
List-I                                List-II
(a) Bioreactors                         i. Insulin produced by rDNA technology
(b) Downstream processing           ii. Vessels which convert raw material into specific Product
(c) Recombinant protein             iii. Detect mutated genes in suspected cancer potien
(d) PCR                                iv. Involves separation and purification.
Choose the correct option from the following

(1)a –iv, b – ii, c – iii, d – i (2)a – i, b – ii, c – iv, d – iii (3)a – ii, b – i, c – iii, d – iv (4)a – ii, b – iv, c – i, d - iii

27. The part of plasmid that codes for proteins involved in the replication of the PBR322 plasmid is

(1)Selectable marker (2)”rop” (3)Cloning site (4)Ori site

28. To isolate DNA from fungal cells, bacterial cells and plant cells, the enzymes required are respectively

(1)Lysozyme, Proteases and Ribonuclease (2)Chitinase, Lysozyme and Cellulase (3)Cellulase, Protease and Lysozyme (4) Lysozyme, Cellulase and Chitinase

29. In mature insulin, which of the peptide is not present?

(1)B-peptide (2)C-peptide (3)A and B peptides (4)A-peptide

30. A scientist wants to produce virus-free plant in tissue culture. Which part of the plant will he use as an explant?
(a) Mature stem (b) Axillary meristem
(c)Apical meristem (d) Mesophyll cells
Choose the correct option from the following.

(1)b and c (2)b only (3)c and d (4) a only

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