CELLS-THE UNIT OF LIFE- IMPORTANT QUESTIONS
CELLS-THE UNIT OF LIFE Q.1 What is the importance of a vacuole in a plant cell? A.1. The vacuole is a membrane-bound space in the cytoplasm of a plant cell. It contains sap, water, excretory products and other materials not useful for the cell. Vacuoles occupy 90% of the cell volume during osmosis. They maintain the turgor pressure against the cell wall thereby maintaining the shape of the cell and cell fluid balance. Q.2. What is a satellite chromosome? A.2. The chromosomes that have an additional or secondary constriction at the distal part of the arm formed by a chromatin thread are known as satellite chromosomes. These appear as an outgrowth or a small fragment. These are also known as marker chromosomes. The chromosomes 13, 14, 15, 16, 21, and 22 are satellite chromosomes. Q.3. Match the following: Column I Column II Cristae Fat membranous sacs in the stroma Cisternae Infoldings in mitochondria Thylakoids Disc-shaped sacs in Golgi apparatus