IAA and Plant Growth Experiment

The video tutorial explores the effects of indole acetic acid (IAA), a type of auxin, on plant growth. It details an experiment using radish seeds to observe how different concentrations of IAA affect root and shoot growth. The video explains the setup, execution, and analysis of the experiment, highlighting the importance of serial dilution and control samples. It also discusses the commercial applications of synthetic auxins, such as weed killers and growth regulators in agriculture.

What is the primary role of indol acetic acid (IAA) in plants?

• To enhance leaf color

• To prevent seed germination

• To promote cell elongation

• To inhibit root growth

Where is IAA primarily produced in plants?

• In the flowers

• In the meristematic tissue

• In the stem

• In the leaves

How does the concentration of IAA affect root growth?

• Low concentrations stimulate root growth

• High concentrations stimulate root growth

• Low concentrations have no effect

• High concentrations inhibit root growth

Why are five seeds used per petri dish in the experiment?

• To ensure faster growth

• To make the experiment more complex

• To replicate results for accuracy

• To use up all the seeds

What is the purpose of using grid acetate in the experiment?

• To provide nutrients

• To measure growth

• To support the seeds

• To absorb excess water

What is the role of the control bottle in the experiment?

• To contain the highest concentration of IAA

• To contain a mixture of all solutions

• To be used as a backup

• To have no IAA for comparison

What is the significance of stacking petri dishes on their sides during incubation?

• To save space

• To ensure even temperature distribution

• To facilitate root and shoot growth direction

• To prevent contamination

How is percentage stimulation calculated in the experiment?

• By comparing growth to the control

• By weighing the plant tissue

• By measuring the total length of shoots

• By counting the number of seeds germinated

What is a commercial use of synthetic auxins like naphthalene acetic acid?

• To enhance flower color

• To stimulate root formation in cuttings

• To increase leaf size

• To act as a pesticide

What effect do high concentrations of IAA have on plant growth?

• They have no effect

• They only affect leaf growth

• They inhibit both root and shoot growth

• They enhance both root and shoot growth