KCET 2025 Practice Test || Exam Questions 31-40

31. Some strains of Bacillus thuringiensis produce proteins that kill insects. Which one of the following is not killed by proteins of Bacillus thuringiensis?

(1) Armyworm (2) Cotton bollworm (3) Tapeworm (4) Tobacco budworm

32. Which one of the following population attributes, contributes to increase in population density?

(1) Mortality and Emmigration (2) Natality and Emmigration (3) Mortality and Immigration (4) Natality and Immigration

33. If 8 individuals in a laboratory population of 80 fruit flies died during a specified time interval, the death rate in the population during that period is

(1) 0.001 individual/time interval (2) 0.1 individual/time interval (3) 1 individual/time interval (4) 0.01 individual/time interval

34. Choose the correct sequence of steps involved in decomposition

(1) Fragmentation  Leaching  Catabolism  Mineralisation  Humification (2) Fragmentation  Mineralisation  Humification  Leaching  Catabolism (3) Fragmentation  Leaching  Catabolism  Humification  Mineralisation. (4) Fragmentation  Catabolism  Leaching  Humification  Mineralisation

35. With respect to limitation of Ecological pyramids, which of the following statements are correct?
a) It does not take into account the same species belonging to two or more trophic levels.
b) It assumes a simple food chain, something that almost never existed in nature.
c) It accommodates saprophytes
d) It does not accommodate a food web
Choose the correct answer from the options given below.

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

36. The ‘Sixth Extinction’ of species, presently in progress, is_____times faster than the previous five episodes of mass extinctions.

(1) 100 to 1000 (2) 1000 to 10000 (3) 1 to 10 (4) 10 to 100

37. Species diversity _____, as we move away from the ______towards____

(1) Decreases, Equator, Poles (2) Decreases, Poles, Equator (3) Stable, Equator, Poles (4) Increases, Equator, Poles

38. In a practical examination, the following pedigree chart was given as a spotter for identification. The students identify the given pedigree chart as_____
(Please imagine a pedigree chart showing affected individuals in a pattern consistent with autosomal recessive inheritance. Typically, this involves affected individuals appearing in offspring of unaffected parents, often skipping generations, and affecting males and females equally.)

(1) Autosomal recessive (2) Sex-linked dominant (3) Sex-linked recessive (4) Autosomal dominant

39. A student observed the T.S. of a plant organ slide under microscope. He observed the vascular bundles in the stelar region as conjoint collateral and open. Based on these features of vascular bundle, identify the correct option from below.

(1) Dicot Stem (2) Monocot Root (3) Monocot Stem (4) Dicot Root

40. A student observed the slide of mitosis under the microscope and observed that the chromosomes were placed at the opposite poles. Which stage was the student observing?

(1) Anaphase (2) Metaphase (3) Telophase (4) Prophase

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