dars
lab
free school lessons
Lessons
My cabinet
Badges
About
Grade 10
1
2
3
4
5
6
7
8
9
10
11
soon
🌐
EN
UZ
O‘zbekcha
EN
English
RU
Русский
Log in
Mathematics
Uzbek language
Literature
English
Russian language
Computing
History of Uzbekistan
World history
Physics
Chemistry (Organic chemistry)
Biology
Geography (Applied geography)
State and law
History of world religions
Advertisement
728×90 · 320×100
Chapter I
The concept of biological systems
1
The science of biology. Properties and levels of life
Lessons 1–2
Chapter II
General biological laws at the molecular level of life
2
The molecular level of life. Chemical composition of the cell
Lessons 3–4
3
Carbohydrates, lipids, proteins and nucleic acids
Lessons 5–6
Chapter III
General biological laws at the cellular level of life
4
The cellular level. Cell theory. Metabolism
Lessons 7–8
5
Photosynthesis, chemosynthesis and protein biosynthesis
Lessons 9–10
6
The cell cycle. Mitosis and meiosis. Laboratory work
Lessons 11–12
Chapter IV
General biological laws at the organism level of life
7
The organism level of life. Types of nutrition
Lessons 13–14
8
Asexual and sexual reproduction
Lessons 15–16
9
Ontogenesis – individual development
Lessons 17
10
Mendel’s laws
Lessons 18–19
11
Chromosome theory. Genetics of sex
Lessons 20–21
12
Sex-linked inheritance. Gene interaction
Lessons 22–23
13
Variation. Genetics and health
Lessons 24–25
14
Hereditary diseases. History of genetic engineering
Lessons 26–27
15
Genetic elements of the cell
Lessons 28–29
16
Enzymes and recombinant DNA
Lessons 30–31
17
Transgenic plants and animals. Hybridoma
Lessons 32–33
18
Biotechnology and achievements in Uzbekistan
Lessons 34–35
Chapter V
General biological laws at the species and population level of life
19
Species and population
Lessons 36–37
20
Laboratory work 2. Evolutionary ideas
Lessons 38–39
21
Linnaeus, Lamarck, Cuvier and Darwin
Lessons 40–41
22
Factors of evolution. Laboratory work 3
Lessons 42–43
23
Struggle for existence. Natural selection
Lessons 44–45
24
Adaptations. Laboratory work 4
Lessons 46–47
25
The synthetic theory. Origin of species
Lessons 48–49
26
Evidence for evolution
Lessons 50–51
27
Biogeography. Types of evolutionary change
Lessons 52–53
28
Main directions of evolution
Lessons 54
29
Views on the origin of life
Lessons 55
30
Chemical evolution. Archaean and Proterozoic
Lessons 56–57
31
The Palaeozoic, Mesozoic and Cenozoic eras
Lessons 58–59
32
Anthropology: evidence for human origins
Lessons 60
33
Human evolution: stages and driving forces
Lessons 61–62
☰ Contents · Biology
Grade 10
›
Biology
›
Week 23
Struggle for existence. Natural selection
Lessons 44–45 · 2 lessons · A. G‘afurov, A. Abdukarimov, J. Tolipova, O. Ishankulov, M. Umaraliyeva, I. Abdurahmonova. Biology, Grade 10, 1st edition. “Sharq” publishing and printing joint-stock company, Tashkent, 2017
Lesson 44
Lesson 45
Quiz
8
Homework
5
Turn on JavaScript in your browser to take the quiz.
← Previous
Week 23 · Lesson 45: Natural selection and its forms
Next →
Week 23 · Homework
Advertisement
300×250 · 728×90