Practice free Plant Anatomy Plant Tissues (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
In a dicot stem, the cortex is differentiated into three sub-zones. Which of these provides mechanical strength to the young stem?
The NCERT states for dicotyledonous stem: 'The outer hypodermis, consists of a few layers of collenchymatous cells just below the epidermis, which provide mechanical strength to the young stem.'
Parenchymatous cells located between the xylem and phloem in a dicot root are referred to as:
The NCERT reads: 'The parenchymatous cells which lie between the xylem and the phloem are called conjuctive tissue.'
How does the size of vascular bundles in monocot leaves compare, particularly reflecting their venation pattern?
The NCERT states: 'The parallel venation in monocot leaves is reflected in the near similar sizes of vascular bundles (except in main veins) as seen in vertical sections of the leaves.'
Which primary difference in secondary growth ability exists between dicot and monocot roots and stems?
From the summary, it states: 'The secondary growth occurs in most of the dicotyledonous roots and stems.' And for monocotyledonous root: 'Monocotyledonous roots do not undergo any secondary growth.' For monocotyledonous stem, the text implies closed vascular bundles do not form secondary tissues. Thus, dicots generally exhibit secondary growth, while monocots typically do not.
Which of the following describes the vascular bundles in a monocotyledonous root?
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.' It also notes for monocotyledons, 'the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.' Combining these, monocot roots have radial and closed vascular bundles.
Regarding the pith in monocotyledonous roots, which statement is correct?
According to the NCERT text, 'Pith is large and well developed' in monocotyledonous roots, in contrast to dicot roots where the pith is 'small or inconspicuous.'
What is a distinguishing characteristic of the number of xylem bundles in a monocot root as compared to a dicot root?
The text explicitly 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.'
Which of the following structures is absent in the vascular bundles of monocotyledonous roots, preventing secondary growth?
The text states: 'In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.'
The tissue organization of a monocotyledonous root includes which of the following components?
The NCERT text details the anatomy of the monocot root: 'It has epidermis, cortex, endodermis, pericycle, vascular bundles and pith.' It further specifies 'Pith is large and well developed.'
The Casparian strips, containing suberin, are present in the endodermis of monocot roots, similar to dicot roots. What is their primary function?
The text mentions, '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 structure acts as a barrier, regulating what enters the stele.
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