Teacher Nguyen Minh Trung, teacher at Gia Dinh High School, Ho Chi Minh City, has taken notes to help grade 12 students master Part 7 of Ecology (Biology) to prepare for the upcoming high school graduation exam. next.
12th grade students AT.1 Gia Dinh High School in Biology class. Illustration Ecology (Biology grade 12) is the part with close knowledge, easy to deduce, so it can be called “easy”. However, the amount of knowledge in this section is very much, so if not codified, it will be “difficult”. Ecology section consists of 3 chapters, 11 lessons, students need to systematize knowledge and understand ecological terms. Specifically in Lesson 35 Habitat and ecological factors , in Chapter I Individuals and biomes , students need the system of ecological factors to include Infertility factor (physical factor and chemical factor) and the existential factor (the organic world and the relationship between organisms). 
The example in the reference year 2021 Question 87: Which of the following ecological factors is the infertility factor? A. Worm. B. Light. C. Worms that eat rice leaves. D. Rice plants. We can easily know that answers A, C, D belong to the existential factor, and answer B is the physical factor – the infertility factor. Besides, we need to understand about ecological limit and ecological drive. In the ecological limit, it is necessary to know the tolerance interval, the favorable interval, the lethal point, the positive point and we can adopt the example of the ecological limit of Tilapia for easier understanding. Students need to be able to distinguish ecological drive and accommodation to avoid confusion we can remember accommodation is just a place of residence still Ecological drive shows the way that species lives. Next, we need to note about the adaptation of the organism to temperature, it is necessary to understand the two Principles of Becman and Alen. Becman’s Rule tells us that “Thermostats live in temperate regions larger body size compared with animals of the same species or closely related species living in warm tropics. We can remember quickly “Body size: animals in temperate> tropical animals”. About the Anlen rule “ Tropical animals that live in temperate regions have ears, tails, and limbs usually smaller ears, tails, and limbs of similar animals living in hot regions ”. Can remember quickly “ Sizing of parts: tropical animals> temperate animals “. 
Students in grade 12AT.1, Gia Dinh High School are making mind maps for lesson 35 One of the content that frequently appears in the exam is Lesson 40 Biomes and some basic features of biomes. First of all, they need a system of relationships between species in a community. 
Example from 2021 references Question 89: In biomes, which of the following ecological relationships belong to the supportive relationship between species. A. Parasites. B. Inhibition – sensitization. C. Competition. D. Symbiosis. When the systematization is easy, we can immediately choose the answer D. At the same time, it is necessary to understand relationship forms and take illustrative examples to easily remember. Test papers often give specific examples asking what relationship it is? Example from 2021 references Question 95: During the breeding season, females in the stork population compete for a favorable place to nest. Here’s an example of a relationship A. competing for the same species. B. supporting the same species. C. Assembly. D. cooperation. Based on the title “female individuals in the stork population” meaning “of the same species”, they “contested”. , We conclude this is an example of a competitive relationship with a species. So for this type of question, we rely on phrases, keywords, and clauses of the question to make inferences. The next and most frequently appearing examples on the test are food chains and food webs. Regarding the food chain, we need to note that there are two types of food chains: the food chain starts from the autotrophic organism and the food chain starts from the organic humus decomposing organism. In food chains and webs, it is easy to confuse the “number” between the nutrient level and the consuming organism. Illustration : Floating plants -> Invertebrates -> Small fish -> Large fish Floating plants are organisms that produce a level 1 nutrient Invertebrates are a primary consumer but are a tier 2 nutrient. Small fish is a tier 2 consumer but is a tier 3 nutrient. Larger fish are tertiary consumers but are a level 4 consumer. Example from 2021 references Question 103: Feeding the food chain: Rice plants Deep eating rice leaves Field frog Hawthorn cobra. In this food chain, which organism belongs to the tertiary consumer group? A. The hawk. B. The bronze frog. C. Worms that eat rice leaves. D. Cobra. With a clear understanding and clear knowledge system, it is easy to identify the Cobra as a third-order consumer. Through basic analysis of the above contents, we easily recognize one thing: Knowledge of Ecology is not difficult, just systematized by mind maps, images, tables, … then we easily solve the questions in the exam. Please plan to systematize your knowledge with mind maps for the Ecology section to do well the 7 questions of Ecology in the high school graduation exam. Based on the 2021 high school graduation exam illustrative exam questions, we can see that the Genetic Mechanism and Variation 9 sentences (with 1 sentence of high application), The genetic rule has 10 sentences (4 sentences with high volatility 2-sentence population genetics (1 sentence highly manipulated), 1-sentence application of genetics, 1-sentence Genealogy genetics, 6-sentence evolution (1 sentence to apply), 7-sentence ecology (1 sentence and Biology in Grade 11 has 4 sentences. Thus, basic knowledge is 7.5 points, applying 1.5 points low and applying 1 point high. We can see that the content of Biology subject with a huge amount of knowledge, to facilitate learning and review students need to systematize knowledge is essential. If students have a clear study and study plan, scoring 7-8 is entirely possible.
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