Question

investigate the conditions required for seed to germinate set up your apparatur as shown in figure keep the dishes at room tempreture for a week explain your absorvation

Answer 1

EXPERIMENT TO PROVE OXYGEN IS NECESSARY FOR GERMINATION - DEFINITION

Aim: To prove that oxygen is necessary for germination.

Apparatus: Two conical flask marked A and B, seeds of pea, water, cotton wool, pyrogallic acid, test tubes.

Procedure: Take two conical flask with a cork and mark them A and B respectively.Place a wet cotton wool in each flask with some soaked Pea seeds. Pyrogallic acid absorbs oxygen so a test tube of in flask B in such a way that the cemical dosent drop in the flask. In flask A hang a test tube of plain water.

Observation: The seeds in flask A germinate because of presence of oxygen and seeds in flask B do not germinate because pyrogallic acid absorbs oxygen.

Result: Oxygen is necessary for germination.

EXPERIMENT TO PROVE THAT SUITABLE TEMPERATURE IS NECESSARY FOR GERMINATION - DEFINITION

Aim: To prove that suitable temperature is necessary for germination.

Apparatus: Two beakers marked A and B, seeds of pea, water and cotton wool.

Procedure: Take two beakers marked A and B respectively. Place some pea seeds on cotton wool in both the beakers.Keep beaker A at room temperature and B in refrigerator.

Observation: The seeds in beaker A germinate and in B do not germinate.

Result: Suitable temperature is necessary for germination.

EXPERIMENT TO PROVE THAT WATER IS NECESSARY FOR GERMINATION - DEFINITION

Aim: To prove that water is necessary for germination.

Apparatus: Two beakers marked A and B, seeds of Pea,water and cotton wool.

Procedure: Take two beakers which are marked A and B respectively.In beaker place some pea seeds on a wet cotton wool and in beaker B pace some pea seed on a dry cotton wool. Keep the beakers at room temperature.

Observation: The seeds in beaker A germinate and in B do not germinate.

Result: Water is necessary for germination.

THREE BEAN SEED EXPERIMENT - DEFINITION

Aim: To prove that seed needs oxygen, water and temperature in equal proportions.

Apparatus: A glass slide, a beaker, a thread and bean seeds.

Procedure: Take a glass slide and tie three mature bean seeds at different position. Place the slide in the beaker containing water in such a way that the seed at top is above the water, the middle seed is at the water level and the third seed is submerged in water.

Observation: The top seed does not germinate as it gets oxygen but no water. The middle seed germinates as it gets both oxygen and water. The bottom seeds do not germinate but shows emergence of tiny radical as it gets dissolved oxygen in water in small amount.

Result: A seed need oxygen, water and temperature in equal proportions. In this experiment, the requirement of oxygen is not completely demonstrated.

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