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BIOLOGY OBJ ANSWERS
1-10: BCDCDACDAB
11-20: ADADCBACBC
21-30: CABBDBAADC
31-40: AABCCBCDAA
41-50: AACBABDDAB
11-20: ADADCBACBC
21-30: CABBDBAADC
31-40: AABCCBCDAA
41-50: AACBABDDAB
BIOLOGY THEORY ANSWERS
(1ai)
A sperm cell consists of a head, middle piece and a whip-like tail. At the anterior end of the head is a structure called Acrosome. This Acrosome contains a liquid which facilitates the entry of the sperm into an egg. The middle piece contains numerous mitochondria which are involved in producing energy needed for propelling the sperm after ejaculation. The tail is for movement.
A sperm cell consists of a head, middle piece and a whip-like tail. At the anterior end of the head is a structure called Acrosome. This Acrosome contains a liquid which facilitates the entry of the sperm into an egg. The middle piece contains numerous mitochondria which are involved in producing energy needed for propelling the sperm after ejaculation. The tail is for movement.
1aii)
A palisade cell contain chloroplasts which makes them a site of photosynthesis in the leaves of those that 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 intercellular spaces in them.
A palisade cell contain chloroplasts which makes them a site of photosynthesis in the leaves of those that 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 intercellular spaces in them.
(1c)
In a tabular form:
In a tabular form:
Under mammals:
(i) Mammals give birth to their young ones alive
(ii) Mammals product amniotic eggs.
(i) Mammals give birth to their young ones alive
(ii) Mammals product amniotic eggs.
Under amphibians:
(i) Amphibians lay eggs
(ii) Amphibians do not produce amniotic eggs.
(i) Amphibians lay eggs
(ii) Amphibians do not produce amniotic eggs.
(1d)
(i)Use of condoms/pills.
(ii) Withdrawal method
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(i)Use of condoms/pills.
(ii) Withdrawal method
==========================
(2a)
(i) carbon dioxide
(ii) Nitrogen
(i) carbon dioxide
(ii) Nitrogen
(2b)
(i) CO 2 is used by plants to photosynthesize carbohydrates (ii) Nitrogen is a major component of chhlorophyll
(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).
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
The green parts
(2ciii)
(i) The parts without chlorophyll do not photosynthesise
(ii) The cells contain chlorophyll
(i) The parts without chlorophyll do not photosynthesise
(ii) The cells contain chlorophyll
(2civ) Nitrogen
(2d)
Holozoic:
Human
Holozoic:
Human
Parasitic:
Tapeworm; Venus flytrap
Tapeworm; Venus flytrap
Symbiotic:
Lichen
Lichen
Saorophytic:
Rhizopus; mushroom; housefly.
Rhizopus; mushroom; housefly.
Autotropic:
Spirogyra; waterleaf plant; elephant grass.
Spirogyra; waterleaf plant; elephant grass.
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(3ai)
renewable resource is a resourcewhich can be used repeatedly and replaced naturally.
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.
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
(i)oxygen
(ii)fresh water
(3bii)
(i)oil
(ii)natural gas
(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.
(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)
(i) Increases soil nutrients
(ii) Improves soil structure.
(iii) Does not corrupt the soil.
(iv) Increases soil humus.
(i) Increases soil nutrients
(ii) Improves soil structure.
(iii) Does not corrupt the soil.
(iv) Increases soil humus.
(3e)
Hb², Hb², I^a, I^o, I^o, T, t
Hb², Hb², I^a, I^o, I^o, T, t
(4ai)
Gene is the discrete unit of inheritance which are found in the chromosomes of all cell.
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.
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.
Trait is the characteristic factor of an individual which are hereditary.
(4b)
Draw the diagram
Phenotyoic ratio= 3:1
Genotypic ratio= 1:2:1
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
==============================
The four transmittable characters in plants are:
-Height
-Colour
-Shape of fruit
-Size of Leaf
==============================
(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
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
(i)Bacteria
(ii)methanogenic archaea
(6b)
Nitrogen — 78%
Oxygen — 21%
Carbon dioxide — 0.04%
Nitrogen — 78%
Oxygen — 21%
Carbon dioxide — 0.04%
(6ci)
(i) Too much clay deposit.
(ii) Too much salt deposit.
(iii) Eusterian vegetation.
(iv) Mangrove forests.
(i) Too much clay deposit.
(ii) Too much salt deposit.
(iii) Eusterian vegetation.
(iv) Mangrove forests.
(6cii)
There roof are mainly buttress and prop up roots which may prop up and down, thus anchoring properly to the soil.
There roof are mainly buttress and prop up roots which may prop up and down, thus anchoring properly to the soil.
(6di)
(i) Typhoid fever.
(ii) Dysentery.
(iii) Cholera.
(i) Typhoid fever.
(ii) Dysentery.
(iii) Cholera.
(6dii)
(i)Food poisoning
(ii) Food spillage.
(iii) Low market value of food.
(i)Food poisoning
(ii) Food spillage.
(iii) Low market value of food.
(6e)
The person need plenty of rest and diet rich in protein, fruits and vegetables and take plenty of water.
The person need plenty of rest and diet rich in protein, fruits and vegetables and take plenty of water.
(6f)
In a tabular form:
In a tabular form:
Under Tillage:
(i) The soil is prepared.
(ii) conserve soil nutrients.
(iii) Good for farm products.
(i) The soil is prepared.
(ii) conserve soil nutrients.
(iii) Good for farm products.
Under Bush burning:
(i) Fire is used to remove plants.
(ii) Destroys soil nutrients.
(iii) A bad farm practice.
(i) Fire is used to remove plants.
(ii) Destroys soil nutrients.
(iii) A bad farm practice.
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