Science
Plant hormones
पादप हार्मोन
In this Class 10 Science topic from the chapter Control and Coordination, students learn how plants coordinate growth and respond to their surroundings without a nervous system. The topic introduces plant hormones such as auxin, gibberellin, cytokinin, abscisic acid and ethylene, explaining their roles in cell growth, seed germination, flowering, dormancy, fruit ripening and leaf fall. Students also connect these chemical signals with responses such as phototropism and geotropism, building a clear understanding of plant regulation and movement.
Practice questions
Why is abscisic acid considered like a stress hormone?MediumLevel 17Which option gives the best match between plant hormone and function?EasyLevel 17If phototropism is normal in a plant but chemotropism is blocked, which process may be affected?MediumLevel 17A plant receives light from one side, and its stem bends towards that side. What is the most accurate role of auxin?MediumLevel 18Why can a high auxin concentration produce different effects in roots and stems?HardLevel 18How can the opposite effects of gibberellin and abscisic acid be understood?MediumLevel 18Why can the effect of abscisic acid be useful for a plant during drought?MediumLevel 18If in an experiment the stem does not bend towards light but the plant is alive, which process is more likely disturbed?MediumLevel 18If cell division decreases in a plant, which hormone deficiency can be related to it?MediumLevel 18If the process of increasing stem length in a plant is reduced, which plant hormone is more related?MediumLevel 18If a pure tall plant is crossed with a pure dwarf plant, which trait will appear in the first generation?MediumLevel 21What does the three-to-one result in the second generation of a monohybrid cross show?MediumLevel 21Why is it not enough to depend only on the visible form of a tall plant to know its exact genetic combination?MediumLevel 20Growth of plants towards light is called what?EasyLevel 1