Сборник задач по подготовке учащихся к международным исследованиям timss и pisa
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Тимс,Пизаға дайындық
| 2.2 Scientific literacy
Task 1. Microorganisms Cyanobacteria are mostly similar to the most ancient microorganisms, which remains (over the age of 3.5 billion years) are found on the Earth. Also they are called blue-green algae. The only non-nuclear cell of these organisms is divided in half, or just a few pieces. Each piece is a holistic functional organism. Fig. 1 Question 1. How many blue green algae will be after 15 - breeding, if they were reproduced by dividing in half (Figure 1).? A. 32768 B. 16587 C. 12.554 D. 14548 Answer: ______________. Question 2. What munifolding happens by parental individual on their own, without the exchange of genetic information with other individuals? A. In asexual form B. Vegetative reproduction C. Fragmentation (body division) Answer: ______________. Question 3. The man’skin is constantly updated. In simpler organisms recovery of entire organs is possible . The ability of living organisms to restore damaged tissues and organs is called regeneration. Which of the following methods of asexual reproduction are not based on regeneration? A. Spore formation B. Budding C. Fragmentation D. Vegetative reproduction Answer: ______________. Question 4. Once in the favorable conditions blue green algae at the end of 20- minute bacteria are divided into two, each of them by the end of the next 20 minutes 150 is divided again into two and so on. Find the number of bacteria by the end of the day. A. 4722366482869645213695 B. 4722366482869645213696 C. 3722366482869645213695 D. 5722366482869645213695 Answer: ______________. Task 2. Snail Snail is one of the largest land snails in our country, and its shape is familiar to each of us: an asymmetrical body, wide flat "foot", two pairs of tentacles and a pair of eyes. Shell color varies from yellow-brown to brownish-white. Fig. 2 Question 1. What determines the color of the shell? A. from food intake The age B. C. the shape of the shell D. shell on the number of revolutions Answer: ______________. Question 2. How to distinguish the age of snails? A) over the thickness of the shell edge otverstvija B) by muscular contractions C) on the shell color D) for the shell-shaped Answer: ______________. жүктеу/скачать 3,47 Mb. Достарыңызбен бөлісу:
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