Plant tissues and anatomy of root, stem, leaf
- Secondary xylem and phloem in dicot stem are produced by Answer: 3. Vascular cambium Secondary growth in a dicot stem is by the lateral meristem called vascular cambium. Vascular cambium cuts secon... 1
- Which of the following is made up of dead cells ? Answer: 2. Phellem Phellem (cork) is made of dead cells with suberin deposits in the walls and no protoplasm. Collenchyma, phloem (sieve ele... 1
- The vascular cambium normally gives rise to : Answer: 2. Secondary xylem Key idea: Vascular cambium is a lateral meristem that adds cells on both sides. It cuts off secondary xylem inwar... 1
- Identify the wrong statement in context of heartwood : Answer: 2. It conducts water and minerals efficiently Key idea: Heartwood is the old, central secondary xylem that has stopped conducting. I... 1
- Which of the following facilitates opening of stomatal aperture ? Answer: 2. Radial orientation of cellulose microfibrils in the cell wall of guard cells Key idea: A stoma opens when guard cells become turg... 1
- Cortex is the region found between Answer: 4. epidermis and stele The cortex is the ground tissue that lies between the epidermis and the stele (the vascular region enclosed b... 1
- The balloon-shaped structures called tyloses Answer: 2. are extensions of xylem parenchyma cells into vessels Tyloses are balloon-like outgrowths of xylem parenchyma cells that protrude... 1
- Specialised epidermal cells surrounding the guard cells are called : Answer: 2. Subsidiary cells Epidermal cells around the guard cells, which differ from other epidermal cells, are subsidiary cells. Bulliform... 1