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Conditions for germination

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Introduction

Topic : 13.2 Subtopic : Germination Title : Conditions for germination Research Question : 1. How does the temperature, presence of water, and oxygen affect germination? 2. What is the best condition for germination to take place Objective : To investigate into the condition for germination and to find the best condition for the process to take place. Hypothesis : Germinations requires suitable temperature, water and oxygen to occur. This is because these three factors are needed to recoil the seed to its previous from the dormant state. Variable : 1) Experiment 1 i) Independent : The availability of water ii) Dependent : The development of the seed iii) Constant : Number of seeds, type of plant of seeds, temperature, availability of oxygen. 2) Experiment 2 i) Independent : The availability of oxygen ii) Dependent : The development of the seed iii) ...read more.

Middle

- The seeds did not develop into plants - Some of the seeds grew into plants - Shoots and roots are long - Only a few seeds show no growth Table 3: The development of maize grains in different temperature CONDITIONS OBSERVATIONS LENGTH � 0.05 cm Root Shoot 1. In the fridge ( less than 0�C) 2. 20�C 3. Room temperature ( 30�C ) - seeds showed no development - no change to the condition of seed - a few of the seeds grew - radical appeared - most of the seeds grew - both radical and plumule are present - 0.60 1.10 - - 1.20 Discussions Germination can be defined as the onset of growth of the embryo, usually after a period of dormancy. This process is regulated by both internal and environmental factors. There are three main factors that affects germination; water, oxygen and suitable temperature. ...read more.

Conclusion

As usual, at optimum temperature of 30�C, the enzyme and hormone work at its maximum and thus makes germination can occur. This proved that suitable temperature is needed for germination. Limitations and recommendations LIMITATIONS RECOMMENDATIONS 1. Pyrogallic acid and sodium hydroxide used in experiment 2 absorbs both oxygen and carbon dioxide. 2. The temperature of 20�C and 30�C is quite hard to made constant 3. The three experiments were not done using the same light intensity. This might distort the accuracy of the data obtained 1. A control experiment should be set up using sodium hydrogen carbonate rather than water to make sure that carbon dioxide is also absorbed. 2.The apparatus should be placed in an incubator set to 20�C and 30�C 3. A light source should be placed at a constant distance to ensure same light supply. Conclusion. Germination requires suitable temperature, water and oxygen to occur. This is because these three factors are needed to recoil the seed to its previous from the dormant state. Hypothesis accepted. ...read more.

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