NCERT Solutions Class 11 Biology Chapter 15 Plant Growth and Development. NCERT book for Biology in Class 11 is strongly suggested by teachers and the CBSE and NCERT boards. These books are now mandatory in various schools. The questions in exams will strictly come from the topics given in these books. Please download the NCERT solutions for Class 11 Biology free in PDF made by teachers of the best schools in India. These solutions are carefully compiled to give detailed understanding of the concepts and also steps of solutions. The NCERT solutions are free to download in pdf format. Please refer to the download link below to download the pdf file and also refer to other chapters and subjects to get the solutions to Biology NCERT book questions and exercises.
1. Define growth, differentiation, development, dedifferentiation, redifferentiation, determinate growth, meristem and growth rate.
Answer • Growth is an irreversible permanent increase in size of an organ or its parts or even of an individual cell.
• Differentiation is the process in which the cells derived from root apical and shoot-apical meristems and cambium differentiate and mature to perform specific functions.
• Development is a term that includes all changes that an organism goes through during its life cycle from germination of the seed to senescence.
• Dedifferentiation is the process in which permanent plant cells regain the power to divide under certain conditions.
• Redifferentiation is the process in which de-differentiated cells become mature again and lose their capacity to divide.
• Determinate growth is the type of growth in which growth stops after a certain phase.
• Meristem are the specialised regions in the plants where active cell divisions take place.
• The increased growth per unit time is termed as growth rate.
2. Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?
Answer Growth, at a cellular level, is principally a consequence of increase in the amount of protoplasm. Measuring the growth of protoplasm involves many parameters such as the weight of the fresh tissue sample, the weight of the dry tissue sample, the differences in length, area, volume, and cell number measured during the growth period. Hence, there cannot be one parameter good enough to demonstrate growth throughout the life of a flowering plant.
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