Practice free Plant Anatomy Plant Tissues (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
In barley stem, vascular bundles are
The vascular bundles in Hordeum vulgare (barley) plant are scattered in ground tissues, many in number and vary in size-smaller towards periphery and bigger towards centre of the ground tissue, oval or rounded in outline, conjoint, collateral and closed.
Guard cells help in ?
Guard cells help in transpiration. Each stomatal opening is surrounded by two specialized epidermal cells, called guard cells. Because of their small size guard cells are rapidly influenced by turgor change and thus regulate the opening and closing of stomata.
Palisade parenchyma is absent in leaves of :-
Sorghum (family-Poaceae) is a monocot plant.The leaves of monocot do not contain palisade parenchyma,because the mesophyll of monocot leaf is not differentiated into palisadeand spongy parenchyma,all being thin walled, chlorophyllous and irregularly compactly arranged with fewer intercellular spaces.
Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of
In hydrophytes, vascular tissue and mechanical tissue are reduced. Cuticle is either completely
absent or if present, it is thin and poorly developed.In xerophytes, cuticle is heavy, well-developed.
Vascular tissue and mechanical tissue are well-developed and differentiated. In mesophytes, cuticle in aerial part is moderately developed. Vascular and mechanical tissues are fairly developed and well differentiated.
Vascular tissues in flowering plants develop from
Histogen theory for shoot apical meristem has been proposed by Hanstein (1870). It advocates that there are three distinct meristematic zones (layers) called dermatogens periblem and plerome. The dermatogens is the outermost histogen giving rise to epidermis, periblem is the middle one producing the cortex and plerome is the innermost resulting in central cylinder (ie, vascular tissues).
Cock cambium (phellogen) is the secondary lateral meristem found in outer cortical region. Its cells divide periclinally cutting off cells towards the outside (forming cork or phellem) and inside (forming secondary cortex or phelloderm).
For a critical study of secondary growth in plants, whic one of the following pairs is suitable:
(b) The increase in the diameter or thickness is due to the formation of secondary tissues as a result of the activities od vascular cambium and cork cambium. this secondary growth is characteristic of dicot stem root.
A common structural feature of vessel elements and sieve tube elements is :-
In plant conducting tissue xylem has an important integral cell as xylem vessel which is without nucleus. The phloem has a row of sieve tubes which are also without nucleus at maturity.
If the stoma remains surrounded by a limited number of cells which cannot be distinguished from other epidermal cells, then this type of stomata is known as.
(d) Anomocytic stomata lacking subsidiary cells surrounding the guard cells. Anisocytic stomata is characterized by the presence of three subsidiary cells of which one is distinctly smaller than the
other two. Paracytic stomata is accompanied on either side by one or more subsidiary cells which lie
parallel to the long axis of the pore and guard cells. Perigenous stomata shows an independent origin of the guard cells and the subsidiary cells.
Fascicular cambium separates the xylem and phloem in:-
(a) In dicotyledonous stems, a thin strip of primary meristem is present in between the xylem and phloem, which is termed as fascicular or vascular cambium. The cambium cells are rectangular and thin walled. Cambium is one layered. In monocot stem cambium is absent.
Epidermis is derived from:-
(d) Epidermis is the outer most covering of the plant which is in direct contact with the external environment. It is single layered or multilayered structure that helps in protection, absorption, excretion, gaseous exchange, transpiration and secretion. The epidermis is derived from dermatogen which is the outer most initial of the shoot apex.
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