Select the correct combination of statements concerning the monocotyledonous stem anatomy:
I. The monocot stem has a sclerenchymatous hypodermis. II. The hypodermis is collenchymatous, similar to the dicot stem. III. It features a large, conspicuous parenchymatous ground tissue. IV. There are a large number of scattered vascular bundles in the ground tissue.
Explanation: Statement I is correct and Statement II is incorrect because the monocot stem has a sclerenchymatous hypodermis, unlike the collenchymatous hypodermis of dicots. Statements III and IV are correct because the monocot stem has a large, conspicuous parenchymatous ground tissue with a large number of scattered vascular bundles.
Question 112 of 115
📘 CLASS XI
Which of the following statements are correct regarding the vascular bundles of a monocotyledonous stem?
I. The vascular bundles are conjoint and closed. II. Each scattered vascular bundle is surrounded by a sclerenchymatous bundle sheath. III. Peripheral vascular bundles are generally larger than the centrally located ones. IV. Peripheral vascular bundles are generally smaller than the centrally located ones.
Explanation: Statement I is correct because monocot stem bundles are conjoint and closed (lacking cambium). Statement II is correct because each scattered bundle is surrounded by a sclerenchymatous bundle sheath. Statement III is incorrect and Statement IV is correct because peripheral vascular bundles are generally smaller than the centrally located ones.
Question 113 of 115
📘 CLASS XI
Read the following statements about the internal details of a monocot stem vascular bundle and select the correct option:
I. Phloem parenchyma is present and well-developed. II. Phloem parenchyma is completely absent. III. Water-containing cavities are present within the vascular bundles. IV. Water-containing cavities are present only in the cortical parenchyma.
Explanation: Statement I is incorrect and Statement II is correct because a key distinguishing feature of monocots is that phloem parenchyma is absent. Statement III is correct and Statement IV is incorrect because water-containing cavities are present within the vascular bundles, not in the general cortex.
Question 114 of 115
📘 CLASS XI
Analyze the statements regarding the primary dicot root anatomy and choose the correct combination:
I. The outermost layer is epiblema, which bears unicellular root hairs. II. Epiblema cells protrude as multicellular root hairs covered with thick cuticle. III. The cortex consists of several layers of thin-walled parenchyma cells with intercellular spaces. IV. The cortical parenchymatous cells are tightly packed without any intercellular spaces.
Explanation: Statement I is correct and Statement II is incorrect because the outermost layer of primary roots is called epiblema, and its cells protrude as unicellular root hairs (cuticle is absent in roots). Statement III is correct and Statement IV is incorrect because the root cortex consists of several layers of thin-walled parenchymatous cells with conspicuous intercellular spaces.
Question 115 of 115
📘 CLASS XI
Identify the correct set of statements regarding the endodermis of a dicotyledonous root:
I. It represents the innermost layer of the cortex. II. It comprises a single layer of barrel-shaped cells without any intercellular spaces. III. The radial and tangential walls of endodermal cells have a deposition of suberin. IV. Suberin is deposited in the form of Casparian strips on radial walls only.
Explanation: Statements I and II are correct because the endodermis is the innermost cortical layer, comprising a single layer of barrel-shaped cells without intercellular spaces. Statement III is correct and Statement IV is incorrect because the deposition of the waxy, water-impermeable material suberin (Casparian strips) occurs on both the tangential as well as radial walls of endodermal cells.
