Grade 11 — Term 3
Aligned with NIE syllabus
This term in the Idasara Academy app has 4 lessons. For each lesson, this page gives you the points you must know and one exam-style question with its answer. None of it needs an account.
Is this what my class is doing now?
Maybe not. The Idasara app groups lessons into its own terms, and your school may teach them in a different order. Where we know a lesson's NIE unit, it is shown on the lesson. Find the unit your class is on, and start there.
Lessons in This Term
Reproduction, Excretion and the Skeletal System
NIE Unit 9
What you must know
- Liver: deaminates amino acids → ammonia → urea (ornithine cycle)
- Reflex arc: stimulus → receptor → sensory neuron → relay neuron → motor neuron → effector
- Antagonistic muscles: bicep contracts → arm bends; tricep relaxes (and vice versa)
- Joints: ball-and-socket (hip, shoulder — all directions); hinge (knee, elbow — one plane)
DNA, Genes and Principles of Heredity
NIE Unit 5
What you must know
- Homozygous: same alleles (TT or tt); Heterozygous: different (Tt)
- Monohybrid cross Aa × Aa → 1 AA : 2 Aa : 1 aa (3:1 phenotype ratio)
- Sex determination: XX = female; XY = male; sex chromosomes from father
- X-linked recessive: colour blindness, haemophilia — more common in males
- Mendel's Laws: Segregation + Independent Assortment
Ecosystems, Food Chains and Biodiversity
NIE Unit 7
What you must know
- Only ~10% energy passes to each trophic level
- Carbon cycle: photosynthesis (fixes C), respiration/combustion (releases C)
- Nitrogen cycle: fixation (lightning, bacteria) → nitrification → uptake → denitrification
- Biodiversity: variety of species; high diversity = resilient ecosystem
- Threats: deforestation, pollution, overfishing, invasive species, climate change
Past Papers and Model Answers
What you must know
- Spaced repetition: revisit at day 1, 3, 7, 14, 30
- Past papers: practise under timed conditions (2h 45m); mark strictly
- Key equations: F=ma, V=IR, P=IV, Q=mcΔT, v=fλ, 6CO₂+6H₂O→C₆H₁₂O₆+6O₂
- Common errors: missing units, photosynthesis/respiration confusion, dominant/recessive mix-up
- Concept map tip: link photosynthesis ↔ respiration ↔ energy ↔ ecosystems
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