BIOLOGY OBJ AND ESSAY
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Biology-Obj
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Mr AYO ✅✅✅✅.
Biology answer now available.
WELCOME TO CAGEY AFRICA,THE HOME OF ALL EXAM RUNZ
*BIOLOGY ANSWERS*
1i) sperm cell is the male reproductive cell that is expelled along with the seminal fluid or semen when a man ejaculates. In humans, spermatozoa determine the gender of the baby-to-be, which means that they can carry either the X or the Y chromosome.
ii)Palisade cells are found in the mesophyll of a leaf and their main function is the absorption of light so that photosynthesis can take place. The palisade mesophyll consists of chloroplasts with chlorophyll that absorb the light energy.
==========================
2a)
i)carbon dioxide
ii)Nitrogen
EXPOVIBES
2b)
i)CO2 is used by plants to photosynthesize carbohydrates.
ii)Nitrogen is a major component of chhlorophyll
2ci)
Variegated leaf is a leaf that has green parts (where the cells contain chlorophyll) and non green parts (where there is no chlorophyll).
2cii)
The green parts
2ciii)
i)The parts without chlorophyll do not photosynthesise
ii)the cells contain chlorophyll
------------------------------------------------------------
3ai)
renewable resource is a resourcewhich can be used repeatedly and replaced naturally.
3aii)
nonrenewable resource is a resource of economic value that cannot be readily replaced by natural means on a level equal to its consumption.
3bi)
i)oxygen
ii)fresh water
3bii)
I)oil
ii)natural gas
3c)
i)Regulated and Planned Cutting of Trees.
ii)Control over Forest Fire.
iii)Reforestation and Afforestation.
v)Check over Forest Clearance for Agricultural and Habitation Purposes.
iv)Proper Utilisation of Forest and Forests Products.
3d)
===============================
4a)
A gene is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases.
4aii) HYBRID
In biology, a hybrid, or crossbreed, is the result of combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction.
----------------------------------------------------------
4ci height of plant
ii size of various parts of the plant such as stems, leaves, flowers, fruits
iii color of parts of plants such as green, white and brown of leaves, stem and root
------------------------------
------------------------------
6ai)
Chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (e.g., hydrogen gas, hydrogen sulfide) or methane as a source of energy, rather than sunlight
6aii)
i)Bacteria
ii)methanogenic archaea
6b)
Nitrogen — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.
_Still solving....✍_
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*2018 WAEC MAY/JUNE BIOLOGY OBJ AND THEORY*
(1a)
(i) - A sperm cell consists of a head, middle piece and whip like tail. At the anterior end of the head is a structure called acrosome. This acrosome contains a liquid which facilitate the entry of the sperm into an egg. The middle piece are involved in producing energy needed for propelling the sperm after ejaculation. The tail is for movement.
(ii) - A palisade cell contain chloroplasts which makes them a site of photosynthesis in the leaves at those plants that contain them. Converting the light to the chemical energy. Beneath the palisade mesophyll are the spongy mesophyll cells, which also perform photosynthesis. They allow the passage of gases through the intracellular spaces in them.
(1b)
[DIAGRAM]
(1c)
IN A TABULAR FORM MAMMALS AND AMPHIBIANS
MAMMALS
- Mammals give birth to their young ones alive.
- Mammals produce amniotic eggs
AMPHIBIANS
- Amphibians lay eggs
- Amphibians do not produce amniotic eggs
(1d)
- Use of condoms/pills
- withdrawal
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
(2a)
(i) carbon dioxide
(ii) Nitrogen
(2b)
(i) CO 2 is used by plants to photosynthesize carbohydrates (ii) Nitrogen is a major component of chhlorophyll
(2ci)
Variegated leaf is a leaf that has green parts (where the cells contain chlorophyll) and non green parts (where there is no chlorophyll).
(2cii)
The green parts
(2ciii)
(i) The parts without chlorophyll do not photosynthesise
(ii) The cells contain chlorophyll
(2civ) Nitrogen
(2d)
Holozoic:
Human
Parasitic:
Tapeworm; Venus flytrap
Symbiotic:
Lichen
Saorophytic:
Rhizopus; mushroom; housefly.
Autotropic:
Spirogyra; waterleaf plant; elephant grass.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
(3ai)
renewable resource is a resourcewhich can be used repeatedly and replaced naturally.
(3aii)
nonrenewable resource is a resource of economic value that cannot be readily replaced by natural means on a level equal to its consumption.
(3bi)
(i)oxygen
(ii)fresh water
(3bii)
(i)oil
(ii)natural gas
(3c)
(i)Regulated and Planned Cutting of Trees.
(ii)Control over Forest Fire.
(iii)Reforestation and Afforestation.
(v)Check over forest clearance for agricultural and habitation Purposes.
(iv)Proper Utilisation of Forest and Forests Products.
(3d)
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
(4ai)
Gene is the discrete unit of inheritance which are found in the chromosomes of all cell.
(4aii)
A hybrid is an offspring obtained from the cross-breeding of the species that are not closely related.
(4aiii)
Trait is the characteristic factor of an individual which are hereditary.
(4b)
Draw the diagram
Phenotyoic ratio= 3:1
Genotypic ratio= 1:2:1
(4c)
The four transmittable characters in plants are:
-Height
-Colour
-Shape of fruit
-Size of Leaf
➖➖➖➖➖➖➖
(6a)
(i) - Chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (e.g., hydrogen gas, hydrogen sulfide) or methane as a source of energy, rather than sunlight
(6aii)
(i) - Bacteria
(ii) - methanogenic archaea
(6b)
Nitrogen — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.
(6c)
(i) - They are composed of relatively few species of plants
(ii) - The salt level of the habitat is high
(iii) - High flooding rate
(iv) - extreme temperature and salinity fluctuations.
(6cii)
Roots of salt marsh plants help stabilize the sandy substrate and trap and hold nutrients and detritus that flow through with each tidal cycle. This detritus trap helps feed bacteria, algae, and invertebrates. These root tangles also provide critical refuge for small fish and other animals.
=================
100per 💯💯 verified
Biology-Obj
1BDDCCBCDBC
11ADCDCCAACC
21CAABBBBCBC
31CABCCACDAA
41ABBDDADDAB
Mr AYO ✅✅✅✅.
Biology answer now available.
WELCOME TO CAGEY AFRICA,THE HOME OF ALL EXAM RUNZ
*BIOLOGY ANSWERS*
1i) sperm cell is the male reproductive cell that is expelled along with the seminal fluid or semen when a man ejaculates. In humans, spermatozoa determine the gender of the baby-to-be, which means that they can carry either the X or the Y chromosome.
ii)Palisade cells are found in the mesophyll of a leaf and their main function is the absorption of light so that photosynthesis can take place. The palisade mesophyll consists of chloroplasts with chlorophyll that absorb the light energy.
==========================
2a)
i)carbon dioxide
ii)Nitrogen
EXPOVIBES
2b)
i)CO2 is used by plants to photosynthesize carbohydrates.
ii)Nitrogen is a major component of chhlorophyll
2ci)
Variegated leaf is a leaf that has green parts (where the cells contain chlorophyll) and non green parts (where there is no chlorophyll).
2cii)
The green parts
2ciii)
i)The parts without chlorophyll do not photosynthesise
ii)the cells contain chlorophyll
------------------------------------------------------------
3ai)
renewable resource is a resourcewhich can be used repeatedly and replaced naturally.
3aii)
nonrenewable resource is a resource of economic value that cannot be readily replaced by natural means on a level equal to its consumption.
3bi)
i)oxygen
ii)fresh water
3bii)
I)oil
ii)natural gas
3c)
i)Regulated and Planned Cutting of Trees.
ii)Control over Forest Fire.
iii)Reforestation and Afforestation.
v)Check over Forest Clearance for Agricultural and Habitation Purposes.
iv)Proper Utilisation of Forest and Forests Products.
3d)
===============================
4a)
A gene is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases.
4aii) HYBRID
In biology, a hybrid, or crossbreed, is the result of combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction.
----------------------------------------------------------
4ci height of plant
ii size of various parts of the plant such as stems, leaves, flowers, fruits
iii color of parts of plants such as green, white and brown of leaves, stem and root
------------------------------
------------------------------
6ai)
Chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (e.g., hydrogen gas, hydrogen sulfide) or methane as a source of energy, rather than sunlight
6aii)
i)Bacteria
ii)methanogenic archaea
6b)
Nitrogen — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.
_Still solving....✍_
Or
Choose this
*2018 WAEC MAY/JUNE BIOLOGY OBJ AND THEORY*
(1a)
(i) - A sperm cell consists of a head, middle piece and whip like tail. At the anterior end of the head is a structure called acrosome. This acrosome contains a liquid which facilitate the entry of the sperm into an egg. The middle piece are involved in producing energy needed for propelling the sperm after ejaculation. The tail is for movement.
(ii) - A palisade cell contain chloroplasts which makes them a site of photosynthesis in the leaves at those plants that contain them. Converting the light to the chemical energy. Beneath the palisade mesophyll are the spongy mesophyll cells, which also perform photosynthesis. They allow the passage of gases through the intracellular spaces in them.
(1b)
[DIAGRAM]
(1c)
IN A TABULAR FORM MAMMALS AND AMPHIBIANS
MAMMALS
- Mammals give birth to their young ones alive.
- Mammals produce amniotic eggs
AMPHIBIANS
- Amphibians lay eggs
- Amphibians do not produce amniotic eggs
(1d)
- Use of condoms/pills
- withdrawal
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
(2a)
(i) carbon dioxide
(ii) Nitrogen
(2b)
(i) CO 2 is used by plants to photosynthesize carbohydrates (ii) Nitrogen is a major component of chhlorophyll
(2ci)
Variegated leaf is a leaf that has green parts (where the cells contain chlorophyll) and non green parts (where there is no chlorophyll).
(2cii)
The green parts
(2ciii)
(i) The parts without chlorophyll do not photosynthesise
(ii) The cells contain chlorophyll
(2civ) Nitrogen
(2d)
Holozoic:
Human
Parasitic:
Tapeworm; Venus flytrap
Symbiotic:
Lichen
Saorophytic:
Rhizopus; mushroom; housefly.
Autotropic:
Spirogyra; waterleaf plant; elephant grass.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
(3ai)
renewable resource is a resourcewhich can be used repeatedly and replaced naturally.
(3aii)
nonrenewable resource is a resource of economic value that cannot be readily replaced by natural means on a level equal to its consumption.
(3bi)
(i)oxygen
(ii)fresh water
(3bii)
(i)oil
(ii)natural gas
(3c)
(i)Regulated and Planned Cutting of Trees.
(ii)Control over Forest Fire.
(iii)Reforestation and Afforestation.
(v)Check over forest clearance for agricultural and habitation Purposes.
(iv)Proper Utilisation of Forest and Forests Products.
(3d)
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
(4ai)
Gene is the discrete unit of inheritance which are found in the chromosomes of all cell.
(4aii)
A hybrid is an offspring obtained from the cross-breeding of the species that are not closely related.
(4aiii)
Trait is the characteristic factor of an individual which are hereditary.
(4b)
Draw the diagram
Phenotyoic ratio= 3:1
Genotypic ratio= 1:2:1
(4c)
The four transmittable characters in plants are:
-Height
-Colour
-Shape of fruit
-Size of Leaf
➖➖➖➖➖➖➖
(6a)
(i) - Chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (e.g., hydrogen gas, hydrogen sulfide) or methane as a source of energy, rather than sunlight
(6aii)
(i) - Bacteria
(ii) - methanogenic archaea
(6b)
Nitrogen — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.
(6c)
(i) - They are composed of relatively few species of plants
(ii) - The salt level of the habitat is high
(iii) - High flooding rate
(iv) - extreme temperature and salinity fluctuations.
(6cii)
Roots of salt marsh plants help stabilize the sandy substrate and trap and hold nutrients and detritus that flow through with each tidal cycle. This detritus trap helps feed bacteria, algae, and invertebrates. These root tangles also provide critical refuge for small fish and other animals.
=================
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