Give reason for the following: (i) The cells of meristematic tissue have dense cytoplasm, thin walls and prominent nuclei. (ii) Vacuoles are absent in the cells of this tissue.
(i) **The cells of meristematic tissue have dense cytoplasm, thin walls, and prominent nuclei:**
- **Reason:** Meristematic tissue is responsible for the growth and development of plants. The cells in this tissue need to be actively involved in the process of cell division and differentiation. The dense cytoplasm contains a high concentration of organelles and nutrients required for these processes. Thin cell walls facilitate cell-to-cell communication and allow flexibility during cell division. Prominent nuclei indicate high metabolic activity and the readiness of cells for division.
(ii) **Vacuoles are absent in the cells of this tissue:**
- **Reason:** Vacuoles are large, membrane-bound organelles found in mature plant cells. In meristematic tissue, cells are actively dividing and differentiating, and the emphasis is on rapid cell division rather than cell enlargement. As a result, vacuoles are either very small or absent in meristematic cells. Vacuoles become more prominent as cells mature and undergo enlargement during the process of cell differentiation and growth.
Certainly! Here are the reasons for the characteristics observed in the cells of meristematic tissue:
(i) **The cells of meristematic tissue have dense cytoplasm, thin walls, and prominent nuclei:**
- **Dense Cytoplasm:** Meristematic cells are actively dividing and metabolically active. The dense cytoplasm indicates high metabolic activity, necessary for rapid cell division and growth.
- **Thin Walls:** Thin cell walls provide less resistance during cell division. This characteristic allows the cells to easily undergo cytokinesis, enabling rapid growth and proliferation.
- **Prominent Nuclei:** The nuclei in meristematic cells are large and prominent because they contain the genetic material necessary for cell division. The active division requires increased genetic material and control over the replication process.
(ii) **Vacuoles are absent in the cells of this tissue:**
- **Role in Growth:** Meristematic cells are actively dividing and responsible for growth and differentiation in plants. The absence of large vacuoles allows for maximum space utilization within the cells for metabolic activities and rapid division.
- **Cellular Organization:** Vacuoles, which are usually prominent in mature plant cells, serve functions such as storage, turgor regulation, and waste management. In meristematic cells, the focus is primarily on rapid division and growth, and the absence of large vacuoles allows more space for the essential organelles involved in cell division and metabolic activities.
These characteristics collectively enable meristematic cells to actively participate in plant growth by providing an environment conducive to rapid cell division, metabolic activity, and the synthesis of new cells and tissues.
Answers & Comments
Answer:
(i) **The cells of meristematic tissue have dense cytoplasm, thin walls, and prominent nuclei:**
- **Reason:** Meristematic tissue is responsible for the growth and development of plants. The cells in this tissue need to be actively involved in the process of cell division and differentiation. The dense cytoplasm contains a high concentration of organelles and nutrients required for these processes. Thin cell walls facilitate cell-to-cell communication and allow flexibility during cell division. Prominent nuclei indicate high metabolic activity and the readiness of cells for division.
(ii) **Vacuoles are absent in the cells of this tissue:**
- **Reason:** Vacuoles are large, membrane-bound organelles found in mature plant cells. In meristematic tissue, cells are actively dividing and differentiating, and the emphasis is on rapid cell division rather than cell enlargement. As a result, vacuoles are either very small or absent in meristematic cells. Vacuoles become more prominent as cells mature and undergo enlargement during the process of cell differentiation and growth.
Answer:
Certainly! Here are the reasons for the characteristics observed in the cells of meristematic tissue:
(i) **The cells of meristematic tissue have dense cytoplasm, thin walls, and prominent nuclei:**
- **Dense Cytoplasm:** Meristematic cells are actively dividing and metabolically active. The dense cytoplasm indicates high metabolic activity, necessary for rapid cell division and growth.
- **Thin Walls:** Thin cell walls provide less resistance during cell division. This characteristic allows the cells to easily undergo cytokinesis, enabling rapid growth and proliferation.
- **Prominent Nuclei:** The nuclei in meristematic cells are large and prominent because they contain the genetic material necessary for cell division. The active division requires increased genetic material and control over the replication process.
(ii) **Vacuoles are absent in the cells of this tissue:**
- **Role in Growth:** Meristematic cells are actively dividing and responsible for growth and differentiation in plants. The absence of large vacuoles allows for maximum space utilization within the cells for metabolic activities and rapid division.
- **Cellular Organization:** Vacuoles, which are usually prominent in mature plant cells, serve functions such as storage, turgor regulation, and waste management. In meristematic cells, the focus is primarily on rapid division and growth, and the absence of large vacuoles allows more space for the essential organelles involved in cell division and metabolic activities.
These characteristics collectively enable meristematic cells to actively participate in plant growth by providing an environment conducive to rapid cell division, metabolic activity, and the synthesis of new cells and tissues.