BOTANY Higher Secondary Second Year - Textbooks Online

More documents

Recommendations

Info

2.5. Secondary growth in dicot stem The primary structure of the plant body is caused by the activity of apical meristems. The primary permanent tissues produced by the apical meristems cause the growth in length and to some extent in thickness. This is called primary growth. Further thickness is observed mostly in dicot plants. This thickness is caused by the addition of new tissues by the activity of the lateral meristems like vascular cambium and cork cambium. The new tissues, which are formed by the lateral meristems, are called secondary tissues. Thus the increase in thickness, due to the addition of secondary tissues by the activity of vascular cambium and phellogen in the stelar and cortical regions is called secondary growth. The process and the structures associated with the secondary growth in dicot stems are given below: Formation of vascular cambial ring The cambium occurring between the xylem and the phloem in the vascular bundle, is called fascicular cambium. In between the vascular bundles, a few parenchymatous cells of the medullary rays that are in line with the fascicular cambium become meristematic and form a strip of cambium. It is called interfascicular cambium. This interfascicular cambium joins up with the fascicular cambium on both sides and forms a continuous ring. It is called a vascular cambial ring. Formation of secondary tissues The vascular cambial ring becomes active and begins to cut off new cells both towards the inner and outer sides. The cells, which are cut off towards the outerside, get differentiated into the secondary phloem, whereas those cut off on the inner side are differentiated into secondary xylem. Secondary phloem consists of sieve tubes, companion cells, phloem parenchyma and phloem fibres. Secondary xylem occupies the major part of the woody stem. It consists of vessels, tracheids, xylem fibres and xylem parenchyma. 102
1. Formation of interfascicular cambial strip Vascular bundle Vascular cambial ring Interfascicular cambial strip Fascicular cambium Fig 2.17 Secondary growth in dicot stem 103 2. Formation of vascular cambial ring 3. Ground plan Lenticel Cork Cork cambium Secondary cortex Primary phloem Secondary phloem First annual ring Second annual ring Primary xylem
Page 1 and 2:
BOTANY Higher Secondary Second Year
Page 3 and 4:
Preface The most important and cruc
Page 5 and 6:
1. Taxonomy PRACTICALS (30 periods)
Page 7 and 8:
1. TAXONOMY OF ANGIOSPERMS Taxonomy
Page 9 and 10:
compared to perianth with two whorl
Page 11 and 12:
a total variety or species. To conc
Page 13 and 14:
well known system of classification
Page 15 and 16:
Self Evaluation I . Choose and writ
Page 17 and 18:
Series (iii) Calyciflorae It includ
Page 19 and 20:
Class III Monocotyledonae Seeds of
Page 21 and 22:
5. How many families were described
Page 23 and 24:
Flower Bracteate or ebracteate, bra
Page 25 and 26:
A twig Sepal Epicalyx Calyx A petal
Page 27 and 28:
Self evaluation I . Choose and writ
Page 29 and 30:
Inflorescence Usually a raceme eg.
Page 31 and 32:
Calyx Ovary Gynoecium Bracteole Flo
Page 33 and 34:
5. Fibre plants Fibres obtained fro
Page 35 and 36:
1.3.3. RUBIACEAE - the coffee famil
Page 37 and 38:
Stem Leaf Aerial, erect, branched,
Page 39 and 40:
1. Beverage plants ECONOMIC IMPORTA
Page 41 and 42:
1.3.4. ASTERACEAE - the sunflower f
Page 43 and 44:
Habit Root Stem Leaf Botanical desc
Page 45 and 46:
Fruit Seed A cypsela. Non-endosperm
Page 47 and 48:
Page 49 and 50:
Flower Bracteate (eg. Petunia hybri
Page 51 and 52:
Stamen Epipetalous stamens T.S. of
Page 53 and 54:
Page 55 and 56:
(eg. Jatropha curcas). In xerophyti
Page 57 and 58: Perianth Tepals 5, arranged in sing
Page 59 and 60: 1. Food plants ECONOMIC IMPORTANCE
Page 61 and 62: MONOCOT FAMILY 1.3.7 MUSACEAE - the
Page 63 and 64: Habit Root Stem Botanical descripti
Page 65 and 66: Androecium Stamens 6, in two whorls
Page 67 and 68: 1.3.8. ARECACEAE - the palm family
Page 69 and 70: Habit Botanical description of Coco
Page 71 and 72: Gynoecium Absent but pistillode is
Page 73 and 74: II. Answer the following questions
Page 75 and 76: Classification of meristem Based on
Page 77 and 78: oval, spherical, rectangular, cylin
Page 79 and 80: Fibres Fibre cells are dead cells.
Page 81 and 82: Tracheid conducting elements in ang
Page 83 and 84: a lining layer of cytoplasm. This i
Page 85 and 86: 2. Epidermis protects the underlyin
Page 87 and 88: made up of barrel shaped parenchyma
Page 89 and 90: 2.2. Anatomy of monocot and dicot r
Page 91 and 92: The endodermal cells, which are opp
Page 93 and 94: Cortex Cortex consists of only pare
Page 97 and 98: Ground plan A sector enlarged Fig.
Page 99 and 100: Ground plan A sector enlarged Fig.
Page 101 and 102: Xylem Xylem consists of xylem fibre
Page 103 and 104: 2.4. Anatomy of a dicot and monocot
Page 105 and 106: Vascular tissues Vascular tissues a
Page 107: II. Answer the following questions
Page 111 and 112: Formation of periderm As secondary
Page 113 and 114: Each annual ring refers to one year
Page 115 and 116: 8. What are complementary cells? 9.
Page 117 and 118: chromosome has one centromere and t
Page 119 and 120: Chromosomal puff Dark band inter ba
Page 121 and 122: The genome size of an individual is
Page 123 and 124: ound pollen (bbll). All the F1 hybr
Page 125 and 126: points called chiasmata. Crossing o
Page 127 and 128: 3.4. Recombination of chromosome Th
Page 129 and 130: Point or gene mutation Point mutati
Page 133 and 134: 127 Fig. 3.6 Chromosomal aberration
Page 135 and 136: Autopolyploidy Ploidy - flow chart
Page 137 and 138: Self evaluation I . Choose and writ
Page 139 and 140: cells was injected into the mouse,
Page 141 and 142: Replication fork Super coil DNA pol
Page 143 and 144: 3.8. Structure of RNA and its types
Page 145 and 146: Role of RNA in protein synthesis Th
Page 147 and 148: The transfer of message present in
Page 149 and 150: IV. Answer the following questions
Page 151 and 152: to join DNA fragments. Thus the res
Page 153 and 154: Ti plasmid T-DNA Foreign DNA Bacter
Page 155 and 156: Restriction enzyme and ligase do no
Page 157 and 158: 4.2 Transgenic plants Introduction
Page 159 and 160:
introducing Bt toxin gene in cotton
Page 161 and 162:
2. The number of transgenic plants
Page 163 and 164:
Pot plant Explant Inoculation Surfa
Page 165 and 166:
. Embryogenesis Formation of embryo
Page 167 and 168:
II. Answer the following questions
Page 169 and 170:
Strain A Strain B Isolation of prot
Page 171 and 172:
The term ‘single cell protein’
Page 173 and 174:
8. What is PEG? 9. How do you remov
Page 175 and 176:
Many enzymes consists of a protein
Page 177 and 178:
5.1.3. Theories explaining the mech
Page 179 and 180:
II. Answer the following questions
Page 181 and 182:
5.2.1. Significance of photosynthes
Page 183 and 184:
The reactions of photosynthesis can
Page 185 and 186:
179 Fig. 5.8. Non-cyclic photophosp
Page 187 and 188:
Difference between cyclic and noncy
Page 189 and 190:
power NADPH 2 . So, two molecules o
Page 191 and 192:
Fig.5.11 Hatch-Slack pathway of CO
Page 193 and 194:
Difference between C 3 and C 4 phot
Page 195 and 196:
Glycine molecules enter into mitoch
Page 197 and 198:
Among leaf factors, such as leaf ag
Page 199 and 200:
Epiphyte eg. Vanda Aerial root Part
Page 201 and 202:
When an insect is attracted by the
Page 203 and 204:
11. The gas evolved during photosyn
Page 205 and 206:
40. Explain the test tube and funne
Page 207 and 208:
201 Fig. 5.17 Overall scheme of res
Page 209 and 210:
Fig. 5.18 Process of Glycolysis 203
Page 211 and 212:
decarboxylation and dehydrogenation
Page 213 and 214:
9. The malic acid is oxidized to ox
Page 215 and 216:
is fixed in the vertical position w
Page 217 and 218:
Nonoxidative phase In this phase, v
Page 219 and 220:
Respiratory quotient for anaerobic
Page 221 and 222:
5. Fructose 1,6-bisphosphate is cle
Page 223 and 224:
32. Write short notes on anaerobic
Page 225 and 226:
this phase is called lag phase. It
Page 227 and 228:
Physiological effects of auxin Auxi
Page 229 and 230:
endosperm of coconut. Cytokinin occ
Page 231 and 232:
4. Bakanae disease in paddy is caus
Page 233 and 234:
5.5. Photoperiodism and vernalizati
Page 235 and 236:
c. sunflower d. maize 4. Which of t
Page 237 and 238:
1. To develop more food crops 2. To
Page 239 and 240:
Clonal selection Crops like sugarca
Page 241 and 242:
The haploid individual plant will h
Page 243 and 244:
methods new improved crops are obta
Page 245 and 246:
6.2. Crop diseases and their contro
Page 247 and 248:
Pathogen The mycelium of Cercospora
Page 249 and 250:
3. They also bring about considerab
Page 251 and 252:
It is hoped that one day geneticall
Page 253 and 254:
2. The genetic resources of the dev
Page 255 and 256:
This will affect millions of uneduc
Page 257 and 258:
additives. It depends upon crop rot
Page 259 and 260:
COMMONLY AVAILABLE MEDICINAL PLANTS
Page 261 and 262:
urinary infections, tuberculosis, m
Page 263 and 264:
Groundnut oil is used to a limited
show all

BOTANY Higher Secondary Second Year - Textbooks Online

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?