- Name the phase in which the:
a) centromeres of chromosomes are lined up at an imaginary plane across the middle of the cell
b) nucleolus re-forms and the spindle fibres disappear
c) chromosomes are visible as duplicated, thick and short thread-like structures
d) cell is about ready to divide by cytokinesis
e) cell is gathering its energy to begin active mitosis
f) two sister chromatids of each chromosome separate at the centromere
- Based on the diagram, answer the following questions:
a) Name the tissue found at the tip of a plant root.
- Apical meristem
b) Where else in a plant is this tissue usually found?
- Shoot tip
c) State the characteristics of the cells found in the tissue named in (a).
- Very small in size / isodiametric in shape /contain a dense cytoplasm / have a large nucleus
d) When mitosis occurs in these cells, primary growth, which records an increase in length and height, results in the root and shoot.
e) For secondary growth in a plant, mitosis occurs in the vascular cambium, a tissue found between the xylem and phloem tissue in dicotyledons.
f) Mitosis is important for growth because it increases the number of cells in the organism.
Tenaga yang boleh diperbaharui dan yang tidak boleh diperbaharui - Sumber-sumber tenaga yang terdapat di dunia ini adalah boleh dikelaskan kepada dua kumpulan, iaitu: 1. Sumber tenaga yang boleh diperbaharui. 2. Sumb...