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Author Topic: CORRECT: 2017/2018 WAEC GCE BIOLOGY Questions And Answer Expo/Runs  (Read 644 times)

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Offline JEFFREY96

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BIOLOGY ANSWERS

BIOLOGY OBJ
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1a)
i).white blood cells
        lipids

aii)
i.responsible for the removal of interstitial fluid from tissues

ii.It transports white blood cells to and from the lymph nodes into the bones

1b)
i).oxygen
ii.excretory products, such as carbon dioxide, urea, etc
iii.Hormones

ii)Plants absorb water from the soil through their root hairs which are surrounded by soil water in the soil. The soil water is a more dilute solution than the soil sap inside the root hair hence water molecules move from soil water into the root hairs by the process of osmosis. Mineral salts are absorbed through the cell membrane often from a zone of their low concentration in the soil to a zone of their higher concentration in the cells of the roots through active absorption.
     
1c)
 i).Placentation is the arrangement of ovules within an ovary. The part of the ovary where the ovules are attached is called a PLACENTA.

 ii). 
Marginal placentation
Parietal placentation
Axile placentation
Free central placentation
==============

3a)
i)Community;Occurring group of different organisms living together and interacting in the same environment.

ii)Population;is defined as the total number of organisms of the same species living together in a given area
 
iii)Ecological niche is the role and position a species has in its environment; how it meets its needs for food and shelter, how it survives, and how it reproduces. A species' niche includes all of its interactions with the biotic and abiotic factors of its environment.

3b)
Because all living organism need energy and nutrient in an environment in other to sustrundipe

3ci)
1) Lack of enough food
2)  Out break of disease
3) lack of money

Cii)
i.Exposed the soil into erosion

ii.Cause loss of nutrient  into the plant

iii.Cause low yield

3d)
To protect against soil erosion; improve the soil by adding organic matter, nutrients, and stability; and scavenge leftover nutrients. In other words Cover crops are used as ground cover, mulches, green manure, nurse crops, smother crops, and forage and food for animals or human

==============
6bi)
Irritability is the Abnormal sensitivity or excessive responsiveness, as of an organ or body part, to a stimulus.

6ci) Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning. Examples of human-powered tilling methods using hand tools include shovelling, picking, mattock work, hoeing, and raking
===============
6ei)Oviparity is the producing eggs that mature and hatch after being expelled from the body, as birds, most reptiles and fishes, and the monotremes.

ii)  Viviparity is the retention and growth of the fertilized egg within the maternal body until the young animal, as a larva or newborn, is capable of independent existence. The growing embryo derives continuous nourishment from the mother, usually through a placenta or similar structure.

6f)

Rhizobium turns the free Nitrogen in air into

- Ammonia
- Nitrate

4ai)Sickle cell anaemia; this is a group of disorders that affects hemoglobin , the molecule in red blood cells that delivers oxygen to cells throughout the body. People with this disorder have atypical hemoglobin molecules called hemoglobin S, which can distort red blood cells into a sickle , or crescent, shape.
Signs and symptoms of sickle cell disease usually begin in early childhood. Characteristic features of this disorder(sickle cell anaemia) include a low number of red blood cells ( anemia ), repeated infections, and periodic episodes of pain.


4d)
i)The presence of fossils;
preserved impressions of organisms/ ancestors that lived in the past
ii)The vestigial structures;
an organ that serves no purpose anymore but did with a common ancestor
iii)The presence of homologous structures;how the bones or parts of an animal are the same but in different proportions
iv)The comparative embryology; in development, embryos look similar until they differentiate later on
V)The molecular evidence ;comparing DNA; to trace differences and similarities in DNA and other molecules, making the species more or less related.
   
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