Waec Expo 2017 Biology(Obj and Essay Theory) Questions And Answers Free Runs
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Waec Expo 2017 Biology(Obj and Essay Theory) Questions And Answers Free Runs

Waec Expo 2017 Biology(Obj and Essay Theory) Questions And Answers Free Runs

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*BIOLOGY ANSWERS*

Biology Obj:
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2a)
i)They catalyse reactions by lowering the activation energy of a reaction
ii)They are regenerated after each reaction
iii)They are substrate specific, hence only molecules which are complementary to their shape can bind to it.
iv)They aid in metabolism(anabolism and catabolism)
2bi)
-Pancreatic lipase
-Amylase
2bii)
i)maltae act
ii)lipase act
2bii)
i)it converts fat and oil to fatty acids and glycerol
ii)it converts starch to maltose
2ci)
Chlorophyll is necessary to absorb the radiant energy of the sun to synthesize sugar during photosynthesis
2cii)
i)Magnessium
ii)Iron
2ciii)
i)Magnessium —}Yellowing of leaves and poor growth
ii)Iron—}Yellowing of leaves and poor growth
=============
1ai)
Classification of living things is the way in which all living things are placed into larger and larger groups or catetories that share similarities and a common ancestry.
1aii)
Carl Linnaeus
1aiii)
i)It allows scientists to identify, group, and properly name organisms via a standardized system
ii)to make it easier to study and understand their behaviors,
iii)To study evolutionary progression of millions of life forms
1aiv)
i)Kingdoms
ii)Phylum
iii)Classes
iv)Order
v)Families
vi)Genus
vii)Species
1bi)
i)they can reproduce
ii)they can mutate
1bii)
i)they do not carry out metabolism on their own hence they do not grow
ii)they contain no cytoplasm or cellular organelles
1ci)
i)mosaic disease of cassava
ii)swollen shoot disease of cocoa
1cii)
i)human immunodeficiency virus (HIV)
ii)measles
==============
6a)
The odorous molecules come into contact with the olfactory epithelium at the top of the nasal cavity and stimulate multiple chemically cell receptors and thus the odour is transmitted to the brain. There after the brain interprets the type of smell.
6b)
i)Shell
ii)Membranes
iii)Airspace
iv)Albumen
v)Yolk
vi)Chalaza
6ci)
autotrophs are organisms that can synthesizes food from inorganic substances by using chemical energy or light
6cii)
i)Bacteria
ii)Unicellular algae
6d)
i)providing leadership on matters critical to health
ii)shaping the research agenda and stimulating the generation
iii)translation and dissemination of valuable knowledge
iv)setting norms and standards
v)promoting and monitoring their implementation
6e)
i)plants: Water Wisteria and Java Moss.
ii)Animals: catfish and earthworm
6f)
In tabular form
-Mammalian skin-
i)It has melanin
ii)It has sweat pores
iii)Does not show photosynthesis
iv)It composes of animal cells
v)It is touch receptive
-Plant epidermis-
i)It has chlorophyll
ii)It has stomata
iii)It shows photosynthesis
iv)It is composed of plant cells
v)It is not touch receptive
6gi)
i)Intra specific competition
6gii)
i)Inter specific competition.
100%correct and confirmed

1ai) Classifications of living things consists of placing together in categories those living things that resembles each other. It involves placing living things into groups that have certain features in common which distinguish them from other groups

1aii) Car von Linnè Also known as Carolus Linnaeus

1aiii)-Classification is important because it allows scientists to identify the organisms
-Classification is important because it makes it easy for scientists to group the organisms.
– It is also good to properly name organisms via a standardized system

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1aiv)-Kingdom
– Phylum(Animal) or division (Plant)
-Class
-Order
-Family
-Genus
-Species
1bi) -Vírus can reproduce when present in another living cell
-It possesses characteristics which can be transmitted from one generation to the next

1bii) -When a virus is extracted from a living cell and placed in a non living medium, it assumes a crystalline form and thus become non-living
-Virus cannot respire, excrete or respond to stimuli

1ci) -Rosette disease
– Cassava mosaic disease

1cii) -Chicken Pox
-Polio
======================

2a)i They catalyse reactions by lowering the activation energy of a reaction
ii). They are regenerated after each reaction
iii). They are substrate specific, hence only molecules which are complementary to their shape can bind to it.
iii). They aid in metabolism (anabolism and catabolism)

2bi)-Pancreatic lipase
– Amylase

2bii)-Fats and oil
-Starch Maltose

2biii) -It converts fat and oils to fatty acids and glycerol
-It converts starch to maltose

2ci)Chlorophyll is necessary to absorb the radiant energy of the sun to synthesize sugar during photosynthesis

2cii)-Magnessium
-Iron

2ciii) Magnessium —>Yellowing of leaves and poor growth
-Iron—>Yellowing of leaves and poor growth

2d) -Take a freshly plucked green leaf and boil it for about 5minutes to kill the cells of the leaf and to burst the starch grains in the cells of the leaf
-Boil the boiled leaf in ethanol to remove the chlorophyll(i.e.decolourizes)
-Dip the decolourized leaf in warm water to soften it
-Wash the leaf in tap water to remove traces of ethanol in it
-Pour iodine solution on it and allow to stand for some minutes
-If the leaf turns blue-black,it contains starch
====================================
3C)

Commensalism
Parasitism
Mutualism

3 i)

Commensalism is a type of relationship where one of the organisms benefits greatly from the symbiosis. The other is not helped but is not harmed or damaged from the relationship. In other words, this is a one-sided symbiotic relationship.
3 ii)
In parasitism, one organism benefits from the relationship but at the expense of the other. The organism may live inside the other’s body or on its surface.

In some of these parasitic relationships the host dies and in others, it is important that the host remain alive.

3 iii)

Parasitism

In parasitism, one organism benefits from the relationship but at the expense of the other.

The organism may live inside the other’s body or on its surface. In some of these parasitic relationships the host dies and in others, it is important that the host remain alive.
6a)
The odorous molecules come into contact with the olfactory epithelium at the top of the nasal cavity and stimulate multiple chemically cell receptors and thus the odour is transmitted to the brain. There after the brain interprets the type of smell.

6b)
i)Shell
ii)Membranes
iii)Airspace
iv)Albumen
v)Yolk
vi)Chalaza

6ci) An autotroph or producer, is an organism that produces complex organic compounds from simple substances present in its surroundings, generally using energy from light or inorganic chemical reactions.

6cii) -Algae
-Green plants

6d)1. Providing leadership on matters critical to health and engaging in partnerships where joint action is needed;
2. Shaping the research agenda and stimulating the generation, translation and dissemination of valuable knowledge;
3. setting norms and standards and promoting and monitoring their implementation;
4. Articulating ethical and evidence-based policy options;
5. Providing technical support, catalysing change, and building sustainable institutional capacity;
6. Monitoring the health situation and addressing health trends

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6e) Plants —>Water lettuce
—->Sword grass

Animals —>Tadpole
——>Crayfish

6gi) -Plot A-Since the maize are all same species equal competitions of nutrients would take place

6gii)Plot B-They are of different species so the maize will highly compete with the pepper on nutrient and sunlight

 

 

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