Form 3 Biology Notes All Topics (New Syllabus)
In this comprehensive guide, we present Form 3 Biology notes covering all topics based on the Tanzania new syllabus, carefully structured to provide clarity, depth, and exam-oriented understanding. We focus on core biological concepts, practical applications, and clear explanations to ensure mastery of the subject.
Biology at this level emphasizes advanced cellular processes, classification systems, genetics, and ecology, forming a strong foundation for higher-level scientific studies.
Classification of Living Things
Kingdom System of Classification
KINGDOM PLANTAE
Kingdom plantae is a kingdom in which all plants are grouped.
Plants: are multi-cellular eukaryotic organisms with ability to manufacture their own food by using energy from the sun through the process of photosynthesis.
DIVISION OF KINGDOM PLANTAE
Kingdom Plantae is made up of the following divisions:-
1. Division bryophyta e.g. Moss plants.
2. Division filicinophyta or pteridophyta. E.g. Fern plants.
3. Division coniferophyta e.g. Pines, cypress
4. Division angiospermophyta e.g. Maize, beans
GENERAL AND DISTINCTIVE FEATURES OF KINGDOM PLANTAE
i. They are multi-cellular.
ii. Their cell walls made of cellulose.
iii. They are eukaryotic organisms.
vi. They reproduce both sexually and asexually.
vii. They store food as starch.
viii. Their cells are organized into tissues, organs and organ systems.
ix. They show limited movement, for example opening and closing of flower petals.
I. DIVISION CONIFEROPHYTA (Gymnosperms)
This division is made up of the cone-bearing plants, hence the name conifers.
The members of this division are called conifers.
Conifers are plants that have needle-shaped leaves and almost all green.
They include plants such as pines, spruces, cedar, red wood, cypress and juniper.
BIOLOGY NOTES FORM THREE – ALL TOPICS
To download this notes please click on each topic link below to open and download the required notes
Topic 1 Classification Of Living Things
Topic 2 Movement
Topic 3 Coordination
Topic 4 Excretion
Topic 5 Regulation
Topic 6 Reproduction
GENERAL CHARACTERISTICS OF DIVISION CONIFEROPHYTA
The following are the general characteristics of conifers.
1. They have cones.
2. They neither have flowers nor fruits.
3. They are wind pollinated.
4. They are vascular, i.e. they have phloem and xylem tissues.
5. Their seeds are not enclosed in an ovary, but in cones.
6. They reproduce sexually by seed.
7. They do not need water for fertilization.
8. Their leaves are needle-like, linear or scale-like.
9. They have alternation of generation.
NB: Some species of conifers have male and female cones on the same individual tree while other species have plants with only male or female cones.
DISTINCTIVE FEATURES OF DIVISION CONIFEROPHYTA
1. Conifers are non-flowering but seed producing plants.
2. They have seed born in cones shaped structure rather than in fruits.
3. Their leaves are needle- shaped and have a thick cuticle for protection and to decrease water loss.
4. They are gymnosperms which means naked- seed
5. Their leaves are needle-like
6. Their seeds are enclosed in cones.
7. They have cones. The female cones contain ovules while the male cones produce microspores known as pollen.
THE STRUCTURE OF PINUS
Pinus are coniferous, evergreen resinous trees which belongs to genus Pinus
Pinus are evergreen, with needle-like leaves
Most of pinus have thick and scaly bark, only few species have thin and flaking bark.
Pinus grow about 15 to 45 metres tall
Most of pinus have female and male cones on the same trees Branches of pinus arise from the same point on the tree.
We have presented complete Form 3 Biology notes aligned with the Tanzania new syllabus, covering all essential topics with clarity and depth. This structured approach ensures a strong understanding of biological principles, preparing learners for examinations and advanced studies. By mastering these concepts, we build a solid foundation in biology that supports both academic success and practical scientific application.
