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# คำถาม คำตอบ สาเหตุ/ขยายความ ทฤษฎีหลักคิด/อ้างอิงในการตอบ คะแนนเต็ม ให้คะแนน
1 D 10
2 D The dissolved oxygen concentration in the flask with algae will be higher in the light but lower in the dark. Photosynthesis in algae when the switch on , algae will photosynthesize and the product from photosynthesis are glucose,oxygen and water.So in the light,the dissolved oxygen will be higher than in the dark. 10
3 ฺฺฺB 10
4 A There use 18 molecules of H2 to produce 12 molecules of water. Do the equations to the balanced term 3H2(g)+2N2(g)⎯→2NH3 next compare the molecules of NH3 to H2O, there gonna be 1:1 then compare H2O to H2 ,there gonna be 2;3.. If produce 12 molecules of water , there will use 18 molecules of H2. 10
5 D The fraction of the progeny of crosses is 1/2 According to Mendel's law. Seperate them into 2 cases are Bb x BB and Tt x tt. then multiply the fraction from 2 cases. 10
6 D It will flow from Venae cava to Aorta through chambers. The way of the flow of the blood is start from 5>1>3>7>8>2>4>6 10
7 A 10
8 A Remove CO2 from the tissue cells. CO2 move from the tissue cells into the blood and go to the lungs. 10
9 A According to the pedigree charts . From the pedrigree charts (I) are X-linked dominant coz Male in gen1 is affected so all females in gen2 are affected too. From the pedrigree charts(II) are X-linked recessive coz in gen1 dont have anyone who are affected but have only female that are carrier so it caused affected males in gen2 . 10
10 A 10
11 B 10
12 C 10
13 B the ratio is 2/3 3/2 Pa: 1Pb it gonna be 2:3 10
14 C N2->NH3 Nitrogen fixing bacteria will use atmospheric nitrogen to form ammonium. 10
15 C It will release energy. Exothermic,it will release the energy.So the graph gonna be like K>L ,M>N, K>N and L>N 10

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