Complete Waec Gce Biology Verified Answers

BIOLOGY Verified-ANSWERS
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1a)Plants take in some compounds like carbon dioxide through their leaves. They absorb some other materials such as compounds of nitrogen, phosphorus, etc., from the soil through their roots.
the transport system consists of tube like passages made up of vascular tissue. There are two types of vascular tissues in plants—xylem and phloem.
The vascular wapbase.org system extends from the roots through the stem and continues up to the leaves. In the leaves it is clearly seen as a pattern of veins. Water and minerals are transported from the roots upwards through the xylem tubes.
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(2ai)
Enzymes are organic catalyst which speed up the rate of chemical reaction but remain chemically unchanged at the end of the reaction

(2aii)
-They are protenious in nature
-They are specific in nature
-They are usually involved in reversible reactions
-They are PH dependent
-They are temperature dependent
-They remain chemically unchanged at the end f the reaction

(2b)
Pancreatic juice contains erepsin,maltase,sucrase and lactase
-Erepsin converts polypeptides to amino acids
-Maltase converts maltose to two glucose
-Sucrase converts sucrose to glucose and fructose
-Lactase converts lactose to glucose and galactose

(2c)
The casts act as mould for setting the fractured bone,milk is rich in proteins ad vitamins is good for growth while sun helps to synthesize vitamin D which aids bone formation

(2d)
-Provision of food
-Recycling of nutrients
-provision of oxygen
-Removal of pollution
-It serves as building block for other substance
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No3 Completed
3ai)
i)Fungi
ii)bacteria
iii)viruses
3aii)
i)bacteria - Streptococcus
ii)Fungi- Basidiomycota
iii)Virus- Coxsackievirus
3aiii)
i)sterilization
ii)disinfection
iii)pasteurization
iv)proper sanitation
v)Proper hygiene
3b)
i)light
ii)pressure
iii)currents
iv)temperature
3ci)
i)Increased human population
ii)Habitat Degredation
iii)Climate Change and Global Warming
3cii)
i)Loss of the beauty of environment
ii)leading to climate warming
iii)it can lead to extinction of to that feeds on those plants


NOTE::: IN TABULAR FORM

5f) DICOTYLEDON
1. Single layered epidermis with thick cuticle
2. Multicellular epidermal hairs may or may not be present
3. Hypodermis is generally collenchymatous
4. The different tissues are arranged in concentric fashion
5. Ground tissue is differentiated into hypodermis, cortex, endodermis, pericycle and pith
6. Always solid
7. Vascular bundles are of similar size
8. Vascular bundles are wedge shaped, definite and arranged in one or two rings
9. Bundle sheath absent
10. Vascular bundles conjoint, collateral and open
11. No cavity in the vascular bundles

MONOCOTYLEDON
1. Single layered epidermis with thick cuticle. Epidermal hairs absent
2. Epidermal hairs absent
3. Hypodermis is generally sclerenchymatous
4. Concentric arrangement is absent
5. No differentiation except hypodermis
6. Solid or hollow
7. Vascular bundles are of different sizes
8. Oval or rounded, numerous and scattered in the ground tissue
9. Bundle sheath Present
10. Conjoint, collateral and closed.
11. A protoxylem cavity present
12. Vessels are oval, few and arranged like the letter V or Y.
13. Phloem parenchyma absent
14. Secondary growth is generally absent


6a)
i)mimicry is a similarity of one species to another that protects one or both.
An example of this is the cuckoo bee.
ii)Camouflage is the structural adaption that enables specie s to blend with their
surroundings; allows a species to avoid
detection by predators.
6b)
i)Their legs are adapted for running
ii)They adapts the leathery forewings as
temina to provide a protective cover for the second set of wings.
iii)they evolved mandibles to bite and chew solid food.
6c)
i)It reduces the quality and quantity of the crops
ii)it reduces their productivity
6d)
i)by refrigerating
ii)by salting
iii)by drying
iv)by the use of silos
6e)
i)in medicine
ii)in crime detection
6f)
i)Inadequate resources
ii)Small planting space
iii)
6g)
Succession is the change in either species
composition, structure, or architecture of
vegetation through time.
6h)
i)it kills microorganisms
ii)It leads to soil erosion
iii)It lost of soil nutrients



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