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콩 새싹의 굴광성 관찰 (Phototropism of Bean Sprout)
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Phototropism of Bean Sprout 콩 새싹의 굴광성 관찰
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콩 새싹의 굴광성 관찰 (Phototropism of Bean Sprout)
1.
손아현
2.
콩 새싹의 굴광성
관찰 탐구동기 학교에서 배운 식물의 굴 광성이 궁금하여 식물(콩) 을 키우면서 얼마나 빛에 빠르게 반응하는 직접 관찰 하여 보기로 하였다.
3.
굴광성이란? 식물이 빛의
방향에 따라 굽어 자 라는 현상을 말한다. 이 때 줄기나 잎처럼 빛이 오는 방 향으로 굽는 성질을 '양굴광성', 뿌리처럼 빛의 반대 방향으로 굽는 성질을 '음굴광성'이라고 한다.
4.
관찰상자설명 관찰구멍 실험을
하기 위해 관찰상자를 만들었다. <Budscope> 스마트폰카메라 Lapse it 앱설치 할로겐등 조명설치
5.
실험방법 실험을 위해
미리 식물 (콩)을 화분에 심어 새 싹이 약 5cm자랐을 때 부터 관찰상자에 넣고 빛은 할로겐 등을 켜서 한 쪽 방향에서만 비추 어 식물이 휘게 하였다.
6.
실험방법 식물(콩)이 어느
정도 휘어진 후 화분을 반대방향으로 돌려 놓고 빛이 있는 쪽으로 다시 휘어질 때까지 성장과정을 2 분마다 계속 카메라로 촬영하 였다. 사진 속의 콩의 각도를 측정하여 그 변화를 그래프로 나타내었다.
7.
실험결과 콩이 반대
방향으로 자라는데 걸린 시간과 각도변화 그래프
8.
결과 해석 식물(콩)의
굴광성은 확인되었는데 특이한 것은 식물을 빛과 반대방향 으로 돌려놓은 처음 10분 동안은 오히려 빛과 반대방향으로 더 성장하 는 결과를 관찰하였다. 가설 가설1. 식물 감각세포가 빛의 변화를 느리게 인식 가설2. 식물의 동작세포가 빠르게 방향을 바꾸지 못한다. 가설3. 식물의 감각세포나 동작세포는 반응이 빠르지만 식물은 신경 계가 없어서 두 세포 사이의 신호가 느리게 전달될 것이다.
9.
감사합니다
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