Practice free Plant Anatomy Plant Tissues (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which type of animal tissue changes the diameter of a blood vessel?
(c) That would be smooth muscles present in the walls of the blood vessels.
Which of the following layers is common to both dicotyledonous and monocotyledonous roots?
The anatomy of the monocot root is similar to the dicot root in many respects. It has epidermis, cortex, endodermis, pericycle, vascular bundles and pith.
Monocotyledonous roots are characterized by a pith that is:
In monocotyledonous roots, the pith is large and well developed, as stated in the NCERT text: 'Pith is large and well developed.'
The vascular bundles in monocot roots are described as:
The context states: 'When xylem and phloem within a vascular bundle are arranged in an alternate manner along the different radii, the arrangement is called radial such as in roots.' And specifically for monocot roots: 'As compared to the dicot root which have fewer xylem bundles, there are usually more than six (polyarch) xylem bundles in the monocot root.'
Arrange the following layers of a monocotyledonous root from the periphery to the center:
Based on Figure 6.3 (b) and the general description of root anatomy, the layers from periphery to center are Epidermis, Cortex, Endodermis, Pericycle, Phloem, Xylem (vascular bundles), and Pith.
Which of the following statements is TRUE regarding the secondary growth in monocotyledonous roots?
The NCERT text clearly states: 'Monocotyledonous roots do not undergo any secondary growth.'
What is the primary difference in vascular tissue organization between monocot and dicot roots?
The text states: 'As compared to the dicot root which have fewer xylem bundles, there are usually more than six (polyarch) xylem bundles in the monocot root.' Both dicot and monocot roots have radial vascular bundles.
In monocotyledonous roots, the vascular bundles are characterized by:
The text states for roots: 'When xylem and phloem within a vascular bundle are arranged in an alternate manner along the different radii, the arrangement is called radial such as in roots.' This applies to both monocot and dicot roots. Monocot roots specifically lack cambium and do not have conjoint bundles.
The innermost layer of the cortex in a monocot root, similar to a dicot root, is called the:
The internal tissue organisation of roots includes: 'The innermost layer of the cortex is called endodermis.' This feature is shared between monocot and dicot roots.
What is the nature of the casparian strips found in the endodermis of a monocot root?
The endodermis 'comprises a single layer of barrel-shaped cells without any intercellular spaces. The tangential as well as radial walls of the endodermal cells have a deposition of water -impermeable, waxy material suberin in the form of casparian strips.' This applies to both dicot and monocot roots, as monocot root anatomy is 'similar to the dicot root in many respects.'
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