Chemoreception in Organisms — Flashcards
Kerala Board · Class 10 · Biology
24 flashcards for Chemoreception in Organisms (Kerala Board Class 10 Biology) to test yourself on key terms and facts.
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What was F.W. Went's experiment with oat coleoptiles, and what did it demonstrate?
Answer
F.W. Went cut the coleoptile tip of oat plants and placed it in agar. When agar blocks were placed on the cut end, the plant grew upward. When placed on one side, the plant bent toward the opposite si…
Define target cells and explain how hormones interact with them.
Answer
Target cells are specific cells where hormones act. Each hormone's target cell has suitable receptors on the cell membrane or inside the cell. Hormones combine with their receptors to form a hormone-r…
How do auxins cause plants to bend toward light (phototropism)?
Answer
Auxins move away from light to the shaded side of the stem. There, they combine with hormone receptors and cause cells to elongate. The elongated cells on the shaded side cause the stem to bend toward…
List the five major plant hormones and their primary functions.
Answer
1. Auxins - stem elongation, inhibit lateral buds, tropic movements 2. Gibberellins - break seed dormancy, stem/root growth, fruit development 3. Cytokinins - cell division, lateral bud growth, delay …
What are synthetic plant hormones and give three examples of their agricultural uses?
Answer
Synthetic plant hormones are artificially produced versions of natural plant hormones. Uses: 1. Synthetic auxins for root formation in cuttings and as weedicides (2,4-D), 2. Synthetic gibberellins to …
Define photoperiodism and explain the role of phytochrome in flowering.
Answer
Photoperiodism is the response of plants to day-night length duration. Phytochrome is a light-sensitive pigment in mature leaves that perceives day-night length and sends signals to the shoot apical m…
Name the two types of cells in the thyroid gland and the hormones they produce.
Answer
1. Follicular cells - produce thyroxine (controls metabolism, body temperature, brain development) 2. Parafollicular cells - produce calcitonin (reduces blood calcium levels)…
Compare hyperthyroidism and hypothyroidism in terms of causes and symptoms.
Answer
Hyperthyroidism: Excessive thyroxine secretion causes increased metabolism, weight loss, increased heart rate, sweating, anxiety. Hypothyroidism: Reduced thyroxine secretion causes decreased metabolis…
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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