Biology Theory For GCE students 2017

6ei) Oviparity is the expulsion of undeveloped eggs rather than live young. The eggs may have been fertilized before release, as in birds and some reptiles, or are to be fertilized externally, as in amphibians and many lower forms. In general, the number of eggs produced by oviparous species greatly exceeds the number of offspring from species that bear live young, but the chances of survival are diminished because of the lack of maternal protection.

Or

Oviparity is the producing eggs that mature and hatch after being expelled from the body, as birds, most reptiles and fishes, and the monotremes.

ii)  Viviparity is the retention and growth of the fertilized egg within the maternal body until the young animal, as a larva or newborn, is capable of independent existence. The growing embryo derives continuous nourishment from the mother, usually through a placenta or similar structure.
6f)

Rhizobium turns the free Nitrogen in air into

- Ammonia
- Nitrate
3a
Occurring group of different organisms living together and interacting in the same environment.

               ii
Population=is defined as the total number of organisms of the same species living together in a given area


           iii
Ecologicalnide==Refers to the specific portion of a habit which is occupied by a particular organism

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             3b
Because all living organism need energy and nutrient in an environment in other to sustrundipe
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              3c
1).  Lack of enough food
2)  out break of disease
3) lack of money Cii
Exposed the soil into erosion

Cause loss of nutrient  into the plant

Cause low yield
6ei) Oviparity is the expulsion of undeveloped eggs rather than live young. The eggs may have been fertilized before release, as in birds and some reptiles, or are to be fertilized externally, as in amphibians and many lower forms. In general, the number of eggs produced by oviparous species greatly exceeds the number of offspring from species that bear live young, but the chances of survival are diminished because of the lack of maternal protection.

Or

Oviparity is the producing eggs that mature and hatch after being expelled from the body, as birds, most reptiles and fishes, and the monotremes.

ii)  Viviparity is the retention and growth of the fertilized egg within the maternal body until the young animal, as a larva or newborn, is capable of independent existence. The growing embryo derives continuous nourishment from the mother, usually through a placenta or similar structure.