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» » WAEC 2019 Biology Verified Questions And Answers

Thursday, 25 April 2019

WAEC 2019 Biology Verified Questions And Answers




BIOLOGY OBJ LOADING..

Use This Is More Accurate Biology -Obj

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  BIOLOGY THEORY QUESTIONS PAPER PICTURES 




BIOLOGY  ANSWERS LOADING...


1ai)

Sexual reproduction:This is a type of reproduction which involves the fussion of male gametes(eg sperm cell) and the female gametes(eg egg cell) to form zygote which later develops to a young offspring

1aii)

-Abstinence

-Birth Control Sponge (Today Sponge)

-Birth Control Vaginal Ring (NuvaRing)

-Birth Control Shot (Depo-Provera)

-Birth Control Implant (Implanon and Nexplanon)

1aiii)

-Mutualism represents a symbiotic relationship where both species involved benefit from the relationship while commensalism represents a symbiotic relationship where only one organism benefits while the other does not benefit from the relationship

-Good examples for mutualism include the relationship between bees and flowers as well as humans and digestive bacteria while Examples for commensalism include hermit crabs using dead gastropods for shelter or millipedes travelling on birds

1b)

i)Hooks and suckers allow it to hold on tightly to the wall of the intestine

ii)Its flat body gives it a large surface area to absorb food

iii)It has no need of a mouth or gut as it absorbs already digested food

1ci) See the diagram.


*3c*

i)  Saprophytes are plants, fungi, and microorganisms that feed on dead or decaying matter (or, in more current and specific usage, they feed on the fungi that feed on the decaying material). 

ii) examples are 
----> molds
----> ghost plant or Indian pipe 
---->mushrooms

---->gnome plant.

3c) i  Saprophytes are plants, fungi, and microorganisms that feed on dead or decaying matter (or, in more current and specific usage, they feed on the fungi that feed on the decaying material). 

ii) examples are 
----> molds
----> ghost plant or Indian pipe 
---->mushrooms
---->gnome plant.
[4/26, 9:36 AM] ‪+234 701 440 8299‬: BIOLOGY-ANSWERS
(6ai)
The enormous energy of lightning breaks nitrogen molecules and enables their atoms to combine with oxygen in the air forming nitrogen oxides. These dissolve in rain, forming nitrates, that are carried to the earth.
(6aii)
This organism oxidizes ammonia into nitrite as a metabolic process. Nitrosomonas are useful in bioremediation. They are important in the nitrogen cycle by increasing the availability of nitrogen to plants while limiting carbon dioxide fixation.
(6aiii)

Azotobacter helps to synthesizes some biologically active substances, including some phytohormones such as auxins, thereby stimulating plant growth.












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