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Thursday, December 31, 2015

Answers for Section E JAMB BIOLOGY 1999




Section E(41 - 50)




Section E
41. The pyramid of biomass shows the progressive decrease in the wet or dry mass of organisms found in each successive trophic level. Option B is better than Option A, because grasshoppers are more abundant than moths and feed on leaves. The moth sucks nectar. - B

42. The white mangrove plants live in swamps (water logged soil) with low oxygen content. The plants develop roots (Breathing roots or pneumatophores) which grow vertically up above the mud to take in Atmospheric oxygen. – C

43. The genotypes are one homozygous black coloured mouse, 2 heterozygous black(Bb) and one homozygous brown coloured mouse. - B
44. DNA (Deoxyribose Nucleic Acid) is found in the nucleus of each living cell. Each individual has a unique DNA to him/herself. - A

45. Fossil-bearing rocks are more likely to contain vertebrates as opposed to invertebrates because life on earth started at simple form (Invertebrates) and gradually changed to more complex forms (Vertebrates). - D

46. Some mush room appear very attractive but are very poisonous - A

47. Arboreal animals are creatures that spend the majority of their lives in trees. They eat, sleep and play in tree canopy. There are thousands of species that live in trees, including:
Monkey, Koalas, Parrots, Chameleons, Tree snakes etc.
They have evolved special adaptations to aid their arboreal lifestyle which includes:
Possession of four limbs, development of long tail, counter shading of coat colour.
The least adaptative feature is the possession of Claws. - B

48. Lamarck’s theory postulates that new species originate through the inheritance of acquired traits. – D

49. The loud cry made by a brooding hen when a predator is around is meant to warn its chicks and other chickens of impending danger. - D

50. Epiphytes in the rain forest compete mostly for light, which is one of the environmental factors apart from water, nutrient and space. - C

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