logo


Home page.


WAEC/JAMB ANSWER 2019/2020 {Click Here To Enter Pin

WhatsApp Chat: 08183565357


« | »

Topic: Verified Waec 2019 Biology Obj and theory now available!

Post By:
On April 26, 2019, at: 7:26 am
Category: Education
>>>>>>>>>>>>>>>>>>>>>>>>

BIOLOGY OBJ

01-10:CBAABABACC

11-20:CCCCACDABC

21:30:DCCDDBCDDB

31-40:DBCDDAACDC

41-50: CAADDCAADC

COMPLETED 💯✅

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

(1ai)
TABULATE:
ORAGNISM |RESPIRATORY SURFACE
Tadpole |Skin
Cockroach|Trachea
Domestic fowl|Lungs
Talinum |Stomata
Earthworm|Skin
Amoeba |Cell membrane

(1b)
(i) Large surface area
(ii) Thin respiratory surface
(iii) Moist surface
(iv) Efficient transport system.
(v) Permeability
(1c)
Draw the diagram

(2ai)
Meat type A and meat type D

(2aii)
They contain the lowest fat content.

(2bi)
Meat type C and meat type D.

(2bii)
-Proteins give energy.
-Strengthens muscles.

(2ci)
A, C and D

(2cii)
A person deficient in protein suffers kwashiokor. Hence a diet with high content in protein is needed.

(2di)
Meat type D

(2dii)
Meat type F

(2e)
Carbohydrate.

(2f)
(i) for energy and heat to keep the body warm.
(ii) They are used as insulators to nerves and cell membranes.
(iii) Formation of cell membranes.

(2g)
Drop the meat on a white paper observe the meat against a source of light, the far part becomes more translucent

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.

(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.

(6b)
(i) Malphigan tubule
(ii) Nephridium

(6c)
(i) Hepatitis: This is a liver disease defined as inflammation of the liver. It may occur as a result of viral infection or toxic substances like poisons or drugs. This disease makes the liver unable to perform it’s functions properly.

(ii) Kidney stones: This is caused by diseased growth in the kidneys within the tubules. This growth narrows rye tubules preventing free flow of urine. It most causes complete blockage of. Urine results.

(6di)
(i) It makes the system insensitive.
(ii) It Mars the protective role of the system.
(iii) Temperature will be poorly regulated.

(6dii)
(i)Cornified layer.
(ii)Granular layer.
(iii)Malphigean layer.

(6ei)
Metamorphosis is the series of gradual changes of forms and shape of insect from the fertilized egg to adult.

(6eii)
Grasshopper – Incomplete
Cockroach – Incomplete
Butterfly – complete
Mosquito – complete
Housefly – complete

>>>>>>>>>>>> >>>

Category: Education

0 Responses

DROP COMMENT FOR THIS POST

Type Inside the Box


NOTE: Your comment will displayed, after 30 minutes

« | »



logo

« Homepage