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| 1. |
Explain what will happen to a plant cell if it is kept m a solution having higher water potential |
| Answer» \xa0\tThe growth that results from cell division in the cambia or lateral meristems which causes the stems and roots to thicken is called secondary growth\tThis type of growth occurs due to the activity of the two lateral meristems- the cork cambium and vascular cambium.\xa0\tSecondary growth in dicots:-\xa01) Formation of cambium ring:\tThe cambium of vascualr bundles becomes meristematic.\tSome of the medullary ray cells lying at the level of cambium also become meristematic.\t\xa0It forms a strip of interfasciular cambium together with intrafasciular cambium to form a circular ring called cambium ring.\tThis cambium ring forms secondary tissues in the stellar region.\tThe vascular cambium consists of two types of cells- fusiform initials and ray initials.\xa0\tThe fusiform initials are vertically oriented which divide to form the elements of xylem and phloem.2)\xa0Formation of secondary vascular tissues:\xa0\tThe cambium ring cuts off new cells, both on outer and inner sides,\tThe new cells formed on the outer side modify into the elements of secondary phloem.\tThe cells formed on the inner side modify into the secondary xylem.3)\xa0Vascular rays:\xa0\tRay initials of the cambium ring form narrow bands of parenchymatous cells.\tThese cells extend radially from the pith to the phloem.\xa0\tThese are called secondary medullary rays or vascular rays.\xa0 | |