Year :
1990
Title :
Biology
Exam :
JAMB Exam
Paper 1 | Objectives
31 - 40 of 50 Questions
| # | Question | Ans |
|---|---|---|
| 31. |
In organism where the 2nd number of chromosomes is 16, the number of chromosomes in each gamete will be A. 32 B. 16 C. 8 D. 4 Detailed SolutionA gamete is a haploid sex cell of an organism which is reproduced sexually. They contain half the number of chromosomes in an organism.no of chromosomes = 16, hence, no of chromosomes in the gamete = \(\frac{1}{2}\) of 16 = 8 |
|
| 32. |
What will be the result of the first filial generation (F1) and the second filial generation (F2) of a mono-hybrid cross between pure line normal-winged Drosophilia flies and pure line short-winged flies, if the gene for the normal wing is dominant? A. F1 flies all short-winged and F2 flies all normal-winged B. F1 flies all normal and F2 flies all short-winged C. F1 flies all short-winged and three-quarters of F2 flies are short-winged D. F1 flies all normal-winged and three-quarters of F2 flies are normal-winged |
D |
| 33. |
 What stage during cell division is represented in the figure above? A. Prophase B. Metaphase C. Anaphase D. Telophase |
C |
| 34. |
An individual in the AB blood group is a universal recipient for blood donation because A. all the red blood cells do not carry antigen B. all the red blood cells carry antigen C. all the red blood cells carry antigen D. there are no anti-A and anti-B antibodies in the serum |
D |
| 35. |
Haemophilia results from the mutation of the genes A. in the sex chromosome B. which control skin colour C. which control the mechanism for blood-clotting D. which control the formation of haemoglobin |
C |
| 36. |
In a savanna ecosystem the abiotic factors include A. legumes, temperature and sandy soil B. water, temperature and soil C. minerals, oxygen and reptiles D. water, soil and grasses |
B |
| 37. |
 Which of the following is an omnivore? A. Praying mantis B. Hawk C. Mouse D. Grasshopper |
C |
| 38. |
Which of the organisms will have the lowest population in an ecosystem? A. Hawk B. Cowpea C. Praying mantis D. Mouse |
A |
| 39. |
The salinity of a brackish enviroment A. increases immediately after rain B. increase at the end of rainy season C. Decrease with increase in micro-organisms D. increase during dry season |
D |
| 40. |
Physiological adaptation to very dry condition in animals is called A. hibernation B. aestivation C. rejuvenation D. xeromorphism |
B |
| 31. |
In organism where the 2nd number of chromosomes is 16, the number of chromosomes in each gamete will be A. 32 B. 16 C. 8 D. 4 Detailed SolutionA gamete is a haploid sex cell of an organism which is reproduced sexually. They contain half the number of chromosomes in an organism.no of chromosomes = 16, hence, no of chromosomes in the gamete = \(\frac{1}{2}\) of 16 = 8 |
|
| 32. |
What will be the result of the first filial generation (F1) and the second filial generation (F2) of a mono-hybrid cross between pure line normal-winged Drosophilia flies and pure line short-winged flies, if the gene for the normal wing is dominant? A. F1 flies all short-winged and F2 flies all normal-winged B. F1 flies all normal and F2 flies all short-winged C. F1 flies all short-winged and three-quarters of F2 flies are short-winged D. F1 flies all normal-winged and three-quarters of F2 flies are normal-winged |
D |
| 33. |
What stage during cell division is represented in the figure above? A. Prophase B. Metaphase C. Anaphase D. Telophase |
C |
| 34. |
An individual in the AB blood group is a universal recipient for blood donation because A. all the red blood cells do not carry antigen B. all the red blood cells carry antigen C. all the red blood cells carry antigen D. there are no anti-A and anti-B antibodies in the serum |
D |
| 35. |
Haemophilia results from the mutation of the genes A. in the sex chromosome B. which control skin colour C. which control the mechanism for blood-clotting D. which control the formation of haemoglobin |
C |
| 36. |
In a savanna ecosystem the abiotic factors include A. legumes, temperature and sandy soil B. water, temperature and soil C. minerals, oxygen and reptiles D. water, soil and grasses |
B |
| 37. |
Which of the following is an omnivore? A. Praying mantis B. Hawk C. Mouse D. Grasshopper |
C |
| 38. |
Which of the organisms will have the lowest population in an ecosystem? A. Hawk B. Cowpea C. Praying mantis D. Mouse |
A |
| 39. |
The salinity of a brackish enviroment A. increases immediately after rain B. increase at the end of rainy season C. Decrease with increase in micro-organisms D. increase during dry season |
D |
| 40. |
Physiological adaptation to very dry condition in animals is called A. hibernation B. aestivation C. rejuvenation D. xeromorphism |
B |