Tuesday, March 13, 2012

INTERNAL ORGANISATION OF PLANTS-ASSIGNMENT

1 In Dicot stem evaporation of water is checked by




Ans:Trichomes and Cuticle
2 The tissue, that is absent in cortex of Dicot stem is




Ans:Sclerenchyma
3 [A] : Dicot stem has Eustele.
[R] : It has top shaped vascular bundles.





Ans:A and R are correct and R is not the correct explanation for A
4 Arrange first time appearance of the following tissues when observed in centripetal manner in the internal structure of Dicot stem
I. Sclerenchyma
II. Phloem
III. Parenchyma
IV. Meristem





Ans:III, I, II, IV
5 Arrange the following plants with gradual increase in the number of vascular bundles in their roots.
I. Ricinus
II. Pisum
III. Trapa
IV. Gossypium





Ans:III, II, IV, I
6 Vascular bundles of root are described as




Ans:Radial, Separate, Closed, Exarch
7 [A] : Endodermis acts as barrier between Cortex and Stele
[R] : It is neither a part of Cortex nor Stele.





Ans:A is correct and R is wrong
8 Root pericycle becomes sclerenchymatous in




Ans:Zea
9 Suberin is present in the cell walls of
I. Exodermis
II. Epidermis
III. Endodermis
IV. General cortex





Ans:I and III
10 The tissue present between xylem and phloem of a root is called as




Ans:Conjunctive tissue
11 Lateral roots are formed from the following part of root.




Ans:Pericycle
12 In terms of number of vascular bundles present in the stele, this dicot shows resemblance with monocot root.




Ans:Castanea
13 Medullary rays of Dicot stem have contact with

I. Fascicular cambium
II. Xylem
III. Pericycle
IV. Phloem





Ans:I, II, III, IV
14 Arrange the following plants in an order of gradual decrease in the distance between Metaxylem elements of adjacent vascular bundles of their roots.
I. Ricinus
II. Pisum
III. Zea
IV)Gossypium





Ans:III, I, IV, II
15 The stele of Monocot stem is described as




Ans:Atactostele
16 Monocot stem differs with the Dicot stem in the following internal features
I. Epidermis without stomata
II. Absence of Trichomes
III. Sclerenchymatous hypodermis





Ans:II, III
17 The most abundantly present tissue in Monocot stem is




Ans:Parenchyma
18 Lysigenous cavity of Monocot stem bundles is formed by




Ans:vessels with annular thickenings
19 Choose the wrong statement




Ans:All the vascular bundles of Monocot stem do not maintain any contact with Hypodermis
20 Protoxylem of a given vascular bundle of Maize has two vessels. If there are 1500 vessels in a given Trasverse section of Maize, the number of Proto xylem lacunae in the stem is




Ans:375
21 Vessels of Monocot stem bundles are arranged in the form of




Ans:V or Y
22 Match the following with respect to Monocot stem





Ans:A - III, B - IV, C - I, D - II
23 Study the following table and choose the correct combination





Ans:II and III
24 [A]: Vascular bundles of Maize stem are described as Closed vascular bundles
[R]: Each vascular bundle of Monocot stem is enclosed by a fibrous sheath





Ans:Both A and R are true but R is not the correct explanation of A
25 Arrange the following organs of Angiosperms with gradual increase in the number of vascular bundles in them.

I. Monocot Root
II. Monocot stem
III. Dicot root
IV. Dicot stem





Ans:III, I, IV, II
26 Choose the correct statement with respect to Maize stem




Ans:Peripheral vascular bundles are many and may be arranged in One or two rings
27 Vascular bundles of Monocot stem are best described as
I. Conjoint
II. Collateral
III. Open
IV. Endarch
V. Oval
VI. Closed
VII. Radial
VIII. Separate





Ans:II, IV, I, V, VI
28 Intercellular spaces are present in the following tissue/s of leaf
I. Mesophyll of Monocot leaf
II. Spongy tissue of Dicot leaf
III. Palisade of Dicot leaf
IV. Bundle sheath of Monocot leaf





Ans:I, II, III
29 Choose the correct statement




Ans:Bundle sheath is a layer made of specialized Mesophyll cells
30 Stomata are absent in the leaves of




Ans:Holoparasites like Balanophora
31 [A]: Bundle sheath of Monocot leaf shows endodermal nature
[R]: Tangential walls of bundle sheath cels show Ligno-Suberin strips





Ans:A is true but R is false
32 Turgor variations are shown by cells not associated with stomata in




Ans:Adaxial epidermis of Zea leaf
33 Match the following





Ans:A - II, B - III, C- IV, D - I
34 in the Transverse section of lamina of the following leaf taken at midpoint, both longitudinal and transverse sections of vascular bundles can be observed




Ans:Smilax
35 Only parenchyma is produced by




Ans:Ray initials
36 The increase in thickness of the stems and roots of Dicots is due to activity of
I. Only primary meristems
II. Intercalary meristems
III. lateral meristems
IV. Apical meristems





Ans:only III
37 The structure of Dicot stem involved in secondary growth is




Ans:Medullary rays
38 Arrange the following ot Dicot stem in secondary growth in correct centripetal sequence.
I. Phloem formed from procambium
II. Xylem formed from procambium
III. Phloem formed from lateral meristem
IV. Xylem formed from vascular cambium





Ans:I, III, IV, II
39 Trunk of dicot stem becomes hard and strong due to more activity of




Ans:fusiform intitials towards inside
40 [A]: Annual rings are absent in Pisum
[R]: Pisum is dicot





Ans:Both A and R are true but R is not the correct explanation of A
41 Continuity between Cambium and Procambium is seen in




Ans:Dicot stem
42 [A]: Growth rings are commonly seen intemperate plants
[R]: In temperate regions much fluctuations in Photoperiod during a year is seen.





Ans:Both A and R are true and R is the correct explanation of A
43 [A]: All growth rings do not have same thickness
[R]: Meteriological conditions vary from year to year.





Ans:Both A and R are true and R is the correct explanation of A
44 In a 20 years old dicot plant, if an early wood of an annual ring has no contact with late wood towards interior, the early wood belongs to




Ans:1st annual ring
45 Resinous colored substances are present in
I. Heartwood
II. Sapwood
III. Cork
IV. Phelloderm





Ans:I and III
46 Commercial cork is obtained from




Ans:Quercus
47 Arrange the following tissues of dicot stem in secondary growth from centre towards the periphery
I. Phellogen
II. Primary cortex
III. Phellum
IV. Phelloderm





Ans:II, IV, I, III

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