Year :
2004
Title :
Biology
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
51 - 60 of 60 Questions
| # | Question | Ans |
|---|---|---|
| 51. |
The ability of some individuals to taste phenylthiocarbamide (PTC) is a A. morphological adaptation B. morphological variation C. physiological adaptation D. physiological variation |
D |
| 52. |
In man, sex is determined by the inheritance of A. a pair of homologous chromosomes B. an extra chromosome in the cells of a female C. a dominant gene for maleness present in man D. two similar X chromosomes in the female and X and Y chromosomes in the male. |
D |
| 53. |
What will be the genotypic ratio when two heterozygous red pea plants are crossed? A. 1 : 0 B. 1 : 2 : 1 C. 2 : 1 D. 3 : 1 |
B |
| 54. |
Which of the following traits in humans can be affected by environmental factors? A. skin colour B. eye colour C. baldness D. tongue-rolling |
A |
| 55. |
Heterozygous tall plants were crossed with pure-breeding dwarf plants of the same species. What were the approximate percentages of the offspring? A. 100% tall 0% dwarf B. 75% tall 25% dwarf C. 50% tall 50% dwarf D. 25% tall 75% dwarf Detailed SolutionA heterozygous tall plant (say Tt) crossed with pure-breeding dwarf plants (tt) will give a set of Tt, Tt, tt and tt. This is 50% tall and 50% dwarf approximately. |
|
| 56. |
In the F1 generation of Mendel’s experiment obtained by crossing pea plants of long stems with those of short stems, A. some were short while others were long B. all were long C. half of them were long while half were short D. three-quarters were long while one quarter were short, |
B |
| 57. |
Which of the following statements is correct about the chromosomes in the gametes? At the end of the second A. each gamete contains only paternal hereditary information B. chromosomes contain a random mixture of paternal and maternal chromosomes. C. chromosomes in the four gamete cells are diploid in number D. chromosomes contain only maternal hereditary information |
B |
| 58. |
Which of the following organisms exhibit division of labour? A. houseflies B. butterflies C. cockroaches D. termites |
D |
| 59. |
Which of the following is not included in the theory of natural selection? A. struggle for existence B. offspring show variation C. inheritance of adaptive structures D. disappearance of functionless organs |
D |
| 60. |
The theory of evolution by natural selection was first put forward by A. Aristotle B. Darwin C. Linnaeus D. Boyle |
B |
| 51. |
The ability of some individuals to taste phenylthiocarbamide (PTC) is a A. morphological adaptation B. morphological variation C. physiological adaptation D. physiological variation |
D |
| 52. |
In man, sex is determined by the inheritance of A. a pair of homologous chromosomes B. an extra chromosome in the cells of a female C. a dominant gene for maleness present in man D. two similar X chromosomes in the female and X and Y chromosomes in the male. |
D |
| 53. |
What will be the genotypic ratio when two heterozygous red pea plants are crossed? A. 1 : 0 B. 1 : 2 : 1 C. 2 : 1 D. 3 : 1 |
B |
| 54. |
Which of the following traits in humans can be affected by environmental factors? A. skin colour B. eye colour C. baldness D. tongue-rolling |
A |
| 55. |
Heterozygous tall plants were crossed with pure-breeding dwarf plants of the same species. What were the approximate percentages of the offspring? A. 100% tall 0% dwarf B. 75% tall 25% dwarf C. 50% tall 50% dwarf D. 25% tall 75% dwarf Detailed SolutionA heterozygous tall plant (say Tt) crossed with pure-breeding dwarf plants (tt) will give a set of Tt, Tt, tt and tt. This is 50% tall and 50% dwarf approximately. |
| 56. |
In the F1 generation of Mendel’s experiment obtained by crossing pea plants of long stems with those of short stems, A. some were short while others were long B. all were long C. half of them were long while half were short D. three-quarters were long while one quarter were short, |
B |
| 57. |
Which of the following statements is correct about the chromosomes in the gametes? At the end of the second A. each gamete contains only paternal hereditary information B. chromosomes contain a random mixture of paternal and maternal chromosomes. C. chromosomes in the four gamete cells are diploid in number D. chromosomes contain only maternal hereditary information |
B |
| 58. |
Which of the following organisms exhibit division of labour? A. houseflies B. butterflies C. cockroaches D. termites |
D |
| 59. |
Which of the following is not included in the theory of natural selection? A. struggle for existence B. offspring show variation C. inheritance of adaptive structures D. disappearance of functionless organs |
D |
| 60. |
The theory of evolution by natural selection was first put forward by A. Aristotle B. Darwin C. Linnaeus D. Boyle |
B |