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Secondary vs Primary Growth Video Lecture | Biology Class 11 - NEET

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FAQs on Secondary vs Primary Growth Video Lecture - Biology Class 11 - NEET

1. What is the difference between secondary and primary growth?
Ans. Primary growth refers to the increase in length or height of a plant, while secondary growth refers to the increase in girth or width of a plant. Primary growth occurs at the apical meristems, located at the tips of roots and shoots, and is responsible for the upward growth of the plant. Secondary growth occurs at the lateral meristems, such as the vascular cambium and cork cambium, and is responsible for the outward growth of the plant.
2. What are the main factors that regulate primary growth in plants?
Ans. Primary growth in plants is regulated by various factors. The main factors include hormones, such as auxins, gibberellins, and cytokinins, which control cell division and elongation. Environmental factors like light, temperature, and water availability also influence primary growth. Additionally, genetic factors play a crucial role in determining the rate and extent of primary growth in different plant species.
3. How does secondary growth contribute to the structural support of woody plants?
Ans. Secondary growth plays a vital role in providing structural support to woody plants. The vascular cambium, a lateral meristem, produces secondary xylem (wood) on the inner side and secondary phloem on the outer side. The secondary xylem provides mechanical strength and rigidity to the plant, allowing it to withstand the forces of wind and gravity. As the secondary xylem accumulates over time, it forms the woody stem or trunk of the plant.
4. What is the significance of secondary growth in the production of timber?
Ans. Secondary growth is of immense significance in the production of timber. Timber is primarily derived from the secondary xylem or wood of woody plants. The continuous production of secondary xylem by the vascular cambium results in the thickening of the stem, which eventually forms the timber. The quality and quantity of timber produced are influenced by the rate and duration of secondary growth, making it a crucial process in the forestry industry.
5. How does the process of secondary growth contribute to the formation of tree rings?
Ans. The process of secondary growth is responsible for the formation of tree rings. Each year, the vascular cambium produces a new layer of secondary xylem, known as the annual ring. The size and characteristics of the annual ring vary depending on the environmental conditions during that particular year. By counting the tree rings, scientists can determine the age of a tree and gain valuable insights into past climatic conditions and growth patterns.
264 videos|514 docs|310 tests
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