Waec gce biology answers 2022

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FIRST SERIES WAEC GCE BIOLOGY THEORY ANSWER

BIOLOGY OBJ

BIOLOGY OBJ
01-10: AADBACBBBA
11-20: CBBCCAAAAB
21-30: DCCCCDBBBD
31-40: DCDBCABDCC
41-50: DBCADBBBBB

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(2a)
(i) Ingestion; taking in pieces of solid food into the mouth
(ii) Digestion: breaking down of large food particles by mechanical/chewing; enzymatic activites/chemical means into smaller particles/soluble that the body can absorb.
(iii) Absorption: taking up the soluble products of digestion into the blood;
(iv) Assimilation: using/utilization of the absorbed food materials by the body cells/tissues
(iv) Egestion: elimination of the undigested food materials through the anus.

(2b)
(i) Secretion: Production and release of substances; useful to the body; by specialized glands of living organism.
(ii) Elimination: Removal of undigested food; from the body of living organisms.
(iii) Excretion: Removal of waste products of metabolism; from the cells/tissues of an organism; may be toxic if retained in the body.

(2c)
Draw the diagram

(1a) Coming…

*Organic evolution* The process by which changes in the genetic composition of populations of organisms occur in response to environmental changes.

*Scientist that contributed to study of evolution*

I) Charles Darwin

II) Thomas Malthus

III) Jean Lamarck

(1bi) Transpiration in plants is the evaporation of water from plants occurring at the leaves while their stomata are open for the passage of CO2 and O2 during photosynthesis.

 

(1bii)

(i)Temperature

(ii) Acidity

(iii) Salt Concentration (iv) Amount of Moisture

(1biii) Stomata allow a plant to take in carbon dioxide, which is needed for photosynthesis. They also help to reduce water loss by closing when conditions are hot or dry. Stomata look like tiny mouths which open and close as they assist in transpiration.

(1biv)

(i) It helps to remove excess water from plants.

(ii) It helps to facilitate the movement of soil water.

(2a)

(i) Ingestion; taking in pieces of solid food into the mouth

(ii) Digestion: breaking down of large food particles by mechanical/chewing; enzymatic activites/chemical means into smaller particles/soluble that the body can absorb.

(iii) Absorption: taking up the soluble products of digestion into the blood;

(iv) Assimilation: using/utilization of the absorbed food materials by the body cells/tissues

(iv) Egestion: elimination of the undigested food materials through the anus.

(2b)

(i) Secretion: Production and release of substances; useful to the body; by specialized glands of living organism.

(ii) Elimination: Removal of undigested food; from the body of living organisms.

(iii) Excretion: Removal of waste products of metabolism; from the cells/tissues of an organism; may be toxic if retained in the body.

(2c)

Draw the diagram

bii)
*Elimination*
It is the removal of indigestible wastes through the anus, in the form of feces,

biii)
*Excretion* is a process, act or function of discharging or ejecting waste product of metabolism, especially from the system of an organism.
Conversely, egestion is the removal of undigested wastes by discharging or expulsing them from the digestive tract via the anus.

*Five stages of holozoic nutrition in human*

I) Ingestion.
II) Digestion.
III) Absorption.
IV) Assimilation.
V) Egestion.

*ROLE OF STOMATA IN TRANSPIRATION*

In photosynthesis, it acts as the organ for gaseous exchange, whereas during transpiration, it acts as an organ for transportation. During transportation, the excess of water loss is monitored by the opening and closing of stomata.

We gat you all always.