41. Which of the following resources cannot be renewed?
- A. Air
- B. Petroleum
- C. Food crop
- D. Soil
42. 
The type of variation illustrated above is
- A. continuous variation
- B. discontinuous variation
- C. morphological variation
- D. environmental variation
43. Which of the following characters is not a morphological variation?
- A. shape of the nose
- B. colour of skin
- C. colour of hair
- D. tongue rolling
44. An apple plant can produce sexually and asexually and it has 40 chromosomes in its leaf cells. How many chromosomes would be in each gamete and somatic cell?
- A. 20 chromosomes in the gametes and 10 in the somatic cells
- B. 40 chromosomes in the gametes and 20 in the somatic cells
- C. 20 chromosomes in the gametes and 40 in the somatic cells
- D. 40 chromosomes in the gametes and 40 in the somatic cells
45 Assuming that A is the gene for normal skin colour and is dominant, while a is the gene for albinism and its recessive, what is the likely genotype of the couple which had 50% normal and 50% albino offspring?
- A. AA, aa
- B. Aa, aa
- C. AA, Aa
- D. Aa, Aa
46. Which of the following statements is true about mutation?
- A. Phenotype is not involved
- B. Genotype is not involved
- C. Artificial induction is not possible
- D. Genotype is involved
47. One of the structural adaptations of mammals for movement on land is the development of the
- A. hollow bones
- B. pentadactyl limb
- C. fused thoracic bones
- D. streamlined body
48. Which of the following is NOT characteristic of social insects?
- A. All members are identical
- B. There is division of labour
- C. The members dwell in the same habitat
- D. Some members protect the queen
49. The gradual cumulative, adaptive and heritable changes in an organism over a long period of time resulting in new species is called
- A. adaptation
- B. survival
- C. organic evolution
- D. interspecific competition
50 A population which exceeds its carrying capacity and then collapses is represented graphically by a
- A. bell-shaped curve
- B. linear curve
- C. sigmoid curve
- D. skewed curve
