Welcome to your Bot set - 3
1.
(A) Xerophytic leaves may contain stomatal crypts or sunken stomata. (R) Spongy parenchyma is more in xerophytic leaves.
2.
(A) Single bundle sheath occurs in wheat. (R) Bundle sheath extensions are parenchymatous.
3.
(A) In dicotyledonous stems, open vascular bundles are present. (R) Cambium is present between phloem and xylem and it possesses the ability to form secondary xylem and phloem.
4.
(A) The guard cells possess chloroplasts and regulate the opening and closing of stomata. (R) The outer walls of guard cells are thick and the inner walls are highly thin.
5.
(A) Histogen theory is not applicable to shoot apex. (R) The shoot apex is not clearly divided into three layers.
6.
(A) Pith is large and well developed in monocotyledonous roots. (R) A large number of rounded, parenchymatous cells with large intercellular spaces occupy the central portion of the stele.
7.
(A) The hairs of cotton have lignin thickening. (R) In aerial parts, epidermal hair serves for defence.
8.
(A) The cuticle provides rigidity to the leaf. (R) Cuticle is formed of sclerenchyma tissue.
9.
(A) In stems, endarch xylem is present. (R) The protoxylem lies towards the center and the metaxylem lies towards the periphery.
10.
(A) A monocot stem has only the primary permanent tissues. (R) Vascular bundles are scattered in monocots.
11.
(A) Citrus has schizogenous cavity and sunflower has lysigenous cavity. (R) Maize has schizolysigenous cavity.
12.
(A) The tap root develops from the radicle. (R) Intercalary meristem originates from the apical meristems.
13.
(A) Cuticle is also present in lower epidermal region of the leaf. (R) The lower epidermis contains a large number of stomata.
14.
(A) Bundle sheath extensions are found in panicoid grasses. (R) Parenchyma cells bordering vascular bundles form bundle sheath.
15.
(A) Cuticle is present below the upper epidermis of leaf. (R) Cuticle checks transpiration.
16.
(A) The two surfaces of isobilateral leaves are equally green. (R) The venation is parallel.
17.
(A) Both surfaces of dorsiventral leaf are equally exposed to sun. (R) Most of the dicotyledonous leaves are dorsiventral.
18.
(A) Shoot apex is protected by young buds. (R) Reproductive shoot apex is protected also by leaf primordia.
19.
(A) The upper surface of the leaf is darker than the lower surface. (R) Spongy mesophyll contains less chloroplasts than palisade mesophyll cells.
20.
(A) Xerophytic leaves may contain stomatal crypts or sunken stomata. (R) Spongy parenchyma is more in xerophytic leaves.
21.
(A) Monocot stem bear collateral open vascular bundles. (R) If the cambium is absent, such vascular bundles are called open type.
22.
(A) In dicot leaves, bundle sheaths are absent. (R) Parenchyma cells form bundle sheath.
23.
(A) Guard cells are living cells. (R) Guard cells operate stomatal opening and closing.
24.
(A) The quiescent centre acts as a reservoir of relatively resistant cells which constitute a permanent source of active initials. (R) Cells in QC activate when initials are damaged.
25.
(A) Collenchyma is dead cells. (R) Walls of collenchyma cell are completely thickened.
26.
(A) Aerial stem of Banana is pseudo-stem. (R) Pseudobulb is modification of Orchid stem.
27.
(A) In monocot stems, vascular bundles are closed. (R) Collateral bundles are always closed.
28.
(A) Monstera plant is not connected with soil. (R) Monstera is an epiphyte.
29.
(A) Vascular rays have one type of cells only. (R) Vascular rays are responsible for water conduction only.
30.
(A) Endodermis forms starch sheath in dicot stems. (R) Casparian bands are found in stems.
31.
(A) Bicollateral bundle is often open. (R) There are two patches of phloem in bicollateral vascular bundle.
32.
(A) Concentric vascular bundles are always closed. (R) Either phloem or xylem forms a solid core in the concentric vascular bundle.
33.
(A): The period between the appearance of two leaf primordia is called plastochrons. (R): Leaf primordia develop below the shoot apex.
34.
(A): The secondary phloem of gymnosperms is similar to angiosperms' secondary phloem. (R): Secondary phloem in phanerogams contains albuminous cells.
35.
(A): In dicot root either pith is absent or very small. (R): Pith develops from ground meristem.
36.
(A): There are no stomata in the epidermal layer of leaves. (R): The leaf epidermis of submerged hydrophytes lacks a cuticle.
37.
(A): Bundle caps cover only a portion of vascular bundle. (R): Bundle sheath completely covers the vascular bundle.
38.
(A): Guard cells are specialised epidermal cells. (R): Stomata are found in the epidermis of leaves.
39.
(A): Vascular cambium forms secondary xylem by the dilation. (R): Secondary xylem forms outside.
40.
(A): Vascular cambium is produced by secondary tissues. (R): It arises between the primary xylem and primary phloem.
41.
(A): Root hairs arise in the zone of active cell division. (R): Root hairs are persisting structures.
42.
(A): Vascular rays develop from ray initials. (R): They help in radial conduction of substances.
43.
(A): Protostele is the simplest type of stele. (R): Siphonostele has pith in the centre.
44.
(A) Medullary rays are called pith rays in higher plants. (R) Pith cells are found between the vascular bundles.
45.
(A) Protoxylem is recently formed xylem. (R) Metaxylem is previously formed xylem.
