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BIOLOGY THEORY ANS
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(1a)
-Single/independent free living organism eg amoeba
-As a colony eg volvox
-As a filament
eg spirogyra
(1b)
-Amoeba
-Volvox
-Spirogyra
(1ci)
-Plant cell are rectangular in shape while Animal cell are spherical in shape
-Plant cell contain chloroplast while animal cell do not contain chloroplast
-Plant cell contain cell wall while animal cell do not contain cell wall
-Plant cell nucleus is at the side while the animal cell is at the middle
(1cii)
-They both have nucleus
-They both have mitochondrion
-They both have endoplasmic reticulum
BIOLOGY THEORY ANS
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2a)
Mouth,Oesophagus,Stomach,Duodenum,Small intestine,Caecum,Appendix,Large intestine,Rectum,Anus
(2bi)
TABULATE
Alimentary canal of birds|Alimentary canal of man
-There is presence of crop|Crop absent
-There is presence of proventiculus|Proventiculus absent
-There is presence of gizzard|Gizzard is absent
(2bii)
-Both have caecum
-Both have Oesophagus
-Both have duodenum
(2c)
Herbivore posses heterodant type of dentition in which they posses teeth of different shapes and sizes.Herbivores feed mainly on vegetable hence its teeth is 28 in numbers.Its incisors are flat with sharp cutting edges for cutting vegetables or grasses .canine is absent.the space creates due to absense of the canine is called diastema.
Diastema allows manipulation of grasses in the mouth.It has a very large molar and premolar closely packed and have very large ridged surface area for cutting and grinding
2d)
-They help in regulation of blood sugar by producing insuling and glucagon
-They help in digestion
-SECTION A
Q3ai) Habitat:- This is defined as the place where an organism lives. Its a place that is suitable to the way of life of an organism. For example, the habitat of a fish is the water which it lives in. Habitat may be small or large.
The types of habitat are : Aquatic, Terrestial and Artoreal habitat.
aii) The 3 role of Decomposers
- They breakdown carbon tied up in large carbohydrate molecules and other minerals contained in dead animal bodies.
- As decomposers feed from the dead animals, they breakdown the organic compounds into simple nutrients.
3b) Energy flow in fresh water habitat.
The ultimate source of energy is sunlight, so the energy flows to the primary producers which are the photosynthetic planktons that traps the energy from the sun and produces it's food through photosynthesis, then it flows to the primary consumers ( Consumer planktons ). Then the energy is transferred to the next energy level when the consumer planktons are eaten by the Secondary Consumers ( small fishes ), and the energy flows lastly to the Tertiary Consumers that is the Big Fishes
Sunlight - - > Photosynthetic Planktons ( primary producers ) - - > Consumer Planktons ( primary consumers ) - - > Small Fish ( Secondary Consumers ) - - > Big fish ( Tertiary Consumers )
C.i) Harmful effects of Micro-organisms.
- They cause disease.
- They causes spoilage of food.
- They aid in water pollution.
C.ii) The Six (6) Beneficial Effects of Micro-organisms.
- They help in maintaining soil fertility.
- Saprophylic micro-organisms decomposes sewage.
- They are used to carryout fermentation process in many food industries.
- They help in recycling nutrients in the ecosystem.
- Some micro-organisms are used for medicinal purposes.
- Some micro-organisms are used in genetically engineering.
=6a)
-Tactic movement movement is found in some plant and animals while nastic movement is found in plants alone
-Tactic movement rsponse to directional stimuli while nastic movement respond to non directional stimuli
6bi)
-Euglena
-Chlamydomonas
6bii)
-Mimosa plant
-Sunflower
6ci)
-Regular cleaning
-Exposure to fresh air
-Eating balanced diet
-Regular exercise
6cii)
-Temperature
-pressure
-Pain
-Cold
6d)
-High temperature affect evaporation and reduces performance
-High temperature may lead to seed dormancy
-It leads to loss of soil nutrients through evaporation
-It affects the ripening and maturity of plant
-it is necessary for germination of seeds
6ei)
Courtship behaviour refers to the instructive behaviour on response to certain external stimuli in animals.It is the pattern of behaviour that preceeds mating and reproduction in animals.It is performed by male and female organism
6eii)
-pairing
-Teritoriality
-Display
6f)
-Holozoic nutrition
-Amoeba
-Entamoeba histolytica
-Humans
6g) Crime detection using finger print method: this applies to forensic.In this method,individuals having different finger print pattern can be identified using database of stored information of such individuals.These method correctly identifies such individuals aptly and is useful in crime detection
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