2018/01/WAEC-GCE-JAN-FEB-BIOLOGY-OBJ-THEORY

(1ai)

GLUCOSE:

-Energy generation

-It helps in metabolism

(1aii)

OXYGEN:

-It helps to oxidize glucose

-it brings about cellular or tissue respiration

(1b)

(i) Aerobic

(ii) Anaerobic

(1c)

(i) Amoeba - Body surface

(ii) Tilapea - Gill

(iii) Adult toad - Lungs

(iv) Grasshopper - Tracheae

(1d) 

DRAW THE DIAGRAM OF OPEN STOMA IN A LEAF AND LABEL[6cm - 8cm long]

(1b)THE ROLE OF OXYGEN IN RESPIRATION

*..Cellular respiration is the process cells use to make energy. Cells in our body combine glucose and oxygen to make ATP and carbon dioxide.

 Cellular respiration starts with glycolysis, where glucose enters the cell, is converted to pyruvate, and makes a few ATP and NADH.

(i) *Glucose Features*

Glucose is a six-carbon sugar molecule which is highly polar and easily dissolves in water. This hexose molecule can be found in L and D conformations, but our body only recognizes D-glucose.

(ii) *Energy Role*

Glucose is the main energy source for body cells. When cells take glucose from the bloodstream, the sugar molecule is broken down through the process of glycolysis, which converts the hexose into pyruvate. Pyruvate can be metabolized further in the citric acid cycle.

(3ai) 

Ecosystem is a system that includes all living organisms (biotic factors) in an area as well as its physical environment (abiotic factors) functioning together as a unit.

(3aii)

Abiotic environment are all physical and nonliving chemical factors, such as soil, water, and atmosphere, which influence living organisms.

(3bi)

-Temperature

-Salinity

-Flow.

(3bii)

-Altitude

-Humidity

-Temperature

(3c)

In a simple ecosystem that consists of rabbits and grass. The grass reproduces at a certain rate, and the rabbits randomly wander around the world eating the grass. If a rabbit stumbles across a patch of grass, they will eat it and gain energy. If a rabbit gains enough energy, they will reproduce. Conversely, if a rabbit wanders around too long without finding any grass to eat, they will die.

(3d) DRAW THE PYRAMID

4a) 

Mendel's 1st Law of inheritance

     States that genes are responsible for the development of the individual and that they are independently transmitted from one generation to another without undergoing ant change

4bi) 

1. the process by which different kinds of living organism are believed to have developed from earlier forms during the history of the earth.

2. the gradual development of something.

3. the giving off of a gaseous product, or of heat.

4. a pattern of movements or manoeuvres.

5. the extraction of a root from a given quantity..

(5a)

Evaporation

Condensation

Precipitation

Collection

Transportation