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.BIOLOGY OBJ
1-10: EDBABEBAEA
11-20: EACDABAAED
21-30: ACBDBDEACE
31-40: DACBEABBAD
41-50: BADDDDBCAD
51-60: BDAEBCBACA
(3a)
(i) Bones are rigid, non-flexible, and tough, whereas cartilage is flexible and are soft-elastic.
(ii) Bones grow in both directions (bidirectional) while cartilage grows in the single direction (unidirectional).
(iii) Bones cells are also known as Osteocytes while cartilage cells are also known as Chondrocytes.
(iv) Bones are active participants of blood supply; Cartilage are not the participants in blood supply, except in perichondrium.
(3aii)
(i) Hydrostatic skeleton
(ii) Exoskeleton
(iii) Endoskeleton.
(3bi)
(3bii)
- Parenchyma
- Collenchyma
- Sclerenchyma
- Xylem
- Phloem
Biology answer
No 1
Tadpoles------ Gills
Cockroaches-- spiracles, trachea .
Domestic fowl.....lungs
Talinum.......Stomata
Earthworm ......Diffusion through skin
Amoeba ..... Cell membrane
1ai)
Sexual reproduction:This is a type of reproduction which involves the fussion of male gametes(eg sperm cell) and the female gametes(eg egg cell) to form zygote which later develops to a young offspring
1aii)
-Abstinence
-Birth Control Sponge (Today Sponge)
-Birth Control Vaginal Ring (NuvaRing)
-Birth Control Shot (Depo-Provera)
-Birth Control Implant (Implanon and Nexplanon)
1aiii)
-Mutualism represents a symbiotic relationship where both species involved benefit from the relationship while commensalism represents a symbiotic relationship where only one organism benefits while the other does not benefit from the relationship
-Good examples for mutualism include the relationship between bees and flowers as well as humans and digestive bacteria while Examples for commensalism include hermit crabs using dead gastropods for shelter or millipedes travelling on birds
1b)
i)Hooks and suckers allow it to hold on tightly to the wall of the intestine
ii)Its flat body gives it a large surface area to absorb food
iii)It has no need of a mouth or gut as it absorbs already digested food
1ci) See the diagram.
(No6i)
Lightning. 1. A discharge of atmospheric electricity, accompanied by a vivid flash of light, commonly from one cloud to another, sometimes from a cloud to the earth. The sound produced by the electricity in passing rapidly through the atmosphere constitutes thunder.
(6ii)Nitrosomonas A genus of gram-negative, ellipsoidal or rod-shaped bacteria whose major source of energy and reducing power is from the oxidation of ammonia to nitrite. Its species occur in soils, oceans, lakes, rivers, and sewage disposal systems
B-A TEAM
(6iii)Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime.
3c
i) Saprophytes are plants, fungi, and microorganisms that feed on dead or decaying matter (or, in more current and specific usage, they feed on the fungi that feed on the decaying material).
ii) examples are
----> molds
----> ghost plant or Indian pipe
---->mushrooms
---->gnome plant.
=========================
3c
i) Saprophytes are plants, fungi, and microorganisms that feed on dead or decaying matter (or, in more current and specific usage, they feed on the fungi that feed on the decaying material).
ii) examples are
----> molds
----> ghost plant or Indian pipe
---->mushrooms
---->gnome plant.
(No6i)
Lightning. 1. A discharge of atmospheric electricity, accompanied by a vivid flash of light, commonly from one cloud to another, sometimes from a cloud to the earth. The sound produced by the electricity in passing rapidly through the atmosphere constitutes thunder.
B-A TEAM
(6ii)Nitrosomonas A genus of gram-negative, ellipsoidal or rod-shaped bacteria whose major source of energy and reducing power is from the oxidation of ammonia to nitrite. Its species occur in soils, oceans, lakes, rivers, and sewage disposal systems
B-A TEAM
(6iii)Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime
5ai)
Commensalism, in biology, a relationship between individuals of two species in which one species obtains food or other benefits from the other without either harming or benefiting the latter.
ii)
Remora fish
iii)
GRAY WATER
RAINWATER COLLECTION
Condensate Water
5b PICK ANY THREE
(ii)
- filtering, settling, dissolving, absorption,
-. The forest cover should be protected by restricting deforestation and through adoption of afforestation programmes.
-The main source of air pollution is the automobiles; therefore, their engines should be redesigned in such a way that their emissions cause minimum pollution. Several steps have been taken and some technology has also been developed, but still it is in a very preliminary stage.
-use of filters and after burner,
-Engine should be well tuned, and
-Mixing of anti-tibs in diesel and petrol,
.
Difference between bone and cartilage
Pick any four
UNDER BONE
-They are rigid, non-flexible, and tough.
-Bones grow in both directions (bidirectional)
-Haversian system and Volkmann's canals are present.
-Bone marrow is present (it is a kind of haematopoietic tissue from which all blood cells are made).
-Lacunae possess canaliculi where each lacuna consist of only one cell (osteocyte).
Under cartilage
-They are flexible and are soft-elastic.
-Cartilage grows in single direction (unidirectional)
-Haversian system and Volkmann's canals are absent.
-Bone marrow is absent.
-Lacunae do not possess canaliculi, and each lacuna has two-three chondrocytes.
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