==>BIOLOGY (OBJ And ESSAY) Waec GCE 2016 Free Expo Answers
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.
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. 4rm
13. Phloem parenchyma absent
14. Secondary growth is generally absent
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 nutrient
2a i)An Enzyme is an organic catalyst, usually proteinous in nature, which promotes or speeds up chemical changes in living cells but are not themselves used in the process
ii)
1.Enzyme is a protein. The main
material of an enzyme is protein
2. It is easily influenced, by
environmental change.
Environmental factors include
temperature, pH, and inhibitor.
3. It acts as catalyst The enzyme
functions in accelerating chemical
reaction, but the enzyme itself
does not change after the reaction
ends.
4. It functions specifically. The
enzyme only catalyzes one kind of
substrate and cannot function for
many substrates. The term is
called one enzyme one substrate.
5. It functions in reverse. It means
the enzyme does not determine
the direction of reaction, but it
only functions in accelerating
reaction rate until it reaches
equilibrium. The enzyme also
functions in substance synthesis
and substance breaking down
reaction.
6. It is required, in small amount . A
small amount of enzyme is able to
catalyze a chemical reaction.
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