100% Real Waec Gce 2015 Biology Obj And Theory Answers

By 10:13 Thu, 10 Sep 2015 Comments


Biology obj

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1a)

Blood- tissue,

guinea pig- organism ,

hebiscus flower- organ.

Human skeleton- system.

Plasmodium-cell.

1b)

Homeostasis can be defined as a property of an

organism or system that helps it maintain its parameters

within a normal range of values. It is key to life, and

failures in homeostasis can lead to diseases like

hypertension and diabetes.

1c)

When d body fluids become acidic ie d concentration of acids becomes higher than that of d bases d kidney excretes more acid.

-When d concentration of d base is higher the kidney will excrete more salt with urine.

1d)

-Inflamation of d nephron caused by bacteria. It causes glomeruli to filter d blood completely leading to useful substances like protein to pass out with d urine excreted by d kidney.

-Secondly wen amino acids and calcium phosphate settle in d kidney they form kidney stone which obstructs the free flow of urine

2a)

Photosynthesis can be represented using a chemical

equation.

The overall balanced equation is...

6CO 2 + 6H 2O ------> C 6 H 12 O 6 + 6O 2

Sunlight energy

Where: CO 2 = carbon dioxide

H 2 O = water

Light energy is required

C 6 H 12O 6 = glucose

O 2 = oxygen

2b) Diagram of Dicotyledon leaf and fully labeled


2c)

i)To produce substances that break down fats,

convert glucose to glycogen,

ii)produce urea (the main

substance of urine), make certain amino acids (the

building blocks of proteins), filter harmful

substances from the blood (such as alcohol),

iii)Storage

of vitamins and minerals (vitamins A, D, K and

B12) and maintain a proper level or glucose in the

blood.

Iv)The liver is also responsible fore producing cholesterol.

v)It produces about 80% of the cholesterol in your body.

(3a) A sample of garden soil was placed in a measuring cylinder, enough water was added to it. It was shaken and allowed to settle for 30 minutes . Draw a diagram 6cm - 8cm long to show the various layers formed and label fully.

(3b)

SANDY SOIL

(1) Sandy soils hold less water per foot of soil, subjecting hybrids to stress during droughty periods.

(2) Low water-holding capacity (about half that of clay loams and clays); tend to dry out quickly.

(3) More leaching of plant nutrients due to low negative

charge and more downward movement of water (because of lower water holding capacity).

(4) Tend to be lower in natural fertility (but not always) due to greater leaching and low content of nutrient-bearing clay.

CLAY SOIL

(1) Clay soils hold more water than other soil textures, but plant roots are not able to extract the moisture needed from clay soils

(2) More prone to soil compaction by animal, foot, or

machinery traffic leading to poor aeration which can deprive crops of air

(3) Soils high in clay (or silt) tend to crust over upon drying

which can inhibit seedling emergence.

(4) Harder to till, not only in terms of power required, but

also regarding ideal moisture range for tillage. If plowed when too wet, they compact and stick. If worked when too dry they're overly hard and cloddy.

6ai)

(i) By Mechanism

(ii) By species

6aii)

(i) Food

(ii) Water

(iii) Territory

(iv) IDK

(6C)

(i) Fluid Feeder:

are organisms that feed on the fluid of other organisms. It can refer to

Hematophagy, feeding on blood, which include bedbug, butterflies, hood mockingbird, oxpeckers and anopheles stephensi mosquito

Nectarivore, feeding on nectar include bats visit open flowers where the nectar is not deeply hidden, hawkmoths and hummingbird

Plant sap feeders

(ii)Filter Feeder:

are a sub group of suspension feeding animals that feed by straining suspended matter and food particles from water, typically by passing the water over a specialized filtering structure. Some animals that use this method of feeding are clams, krill, sponges, baleen, whales, and fish (including sharks)

6D

(ii)

(i) to move the position of th hairs

(ii) adjust the angle of hair shafts to change the degree

of cornfield layer idk

(iii)

(i) maintaing the epidermal permeability barrier, structure and differentiation

(ii) skin specific hormonal signalling

6E

Decline in the Death Rate:

Better Medical Facilities:

More Hands to Overcome Poverty:

Technological Advancement in Fertility

Treatment:

Immigration

6F

Preventing pregnancy-related health risks in

women

Reducing infant mortality

Helping to prevent HIV/AIDS

Empowering people and enhancing education

Slowing population growth

=============== Completed! ==================


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