Botany lecture notes

Economic Importance of Gymnosperms (Short Notes)

economic importance of gymnosperms

Economic Importance of Gymnosperms

The Gymnosperms are with high economic importance to mankind. For easy understanding, the economic importance of Gymnosperms can be categorized in the following heads:

(1).      Food Value

(2).      Medicinal Value

(3).      Timber Value

(4).      Source of Oil

(5).      Industrial Value

(6).      Ornamental Value

(7).      Other Uses

gymnosperms economic aspects

(1). Food Value

Ø  Cycads are a good source of Starch.

Ø  ‘Sago’ is a starch obtained from the pith and cortex of the stem of Cycas revolute and Cycas rumphi.

Continue reading

Botany lecture notes

Anomalous Secondary Thickening in Dracaena Stem: Lecture Notes and Diagram

anomalous secondary thickening in monocots

Anomalous Secondary Thickening in Dracaena
Anomalous Secondary Thickening in Monocots

Before going to the secondary thickening in Dracaena, first see what anomalous secondary thickening is and how the process of anomalous secondary thickening happens in plants.

What is Anomalous Secondary Thickening?

Ø  In many plants, the pattern of the secondary thickening shows deviation from the normal type.

Ø  The term “Anomalous Secondary Growth” is given for this deviation or variation.

Ø  The anomalous secondary growth is more common in tropical plants.

Ø  Anomalous secondary thickening is NOT an anomaly or disease in plants; rather it is an adaptation to suit the habit and habitat of the plant.

Continue reading

what is Caytonanthus

Caytoniales General Characteristics

what is caytoniales

(General Characteristics of Caytoniales)

What are Caytoniales?

Ø  Caytoniales were a small group of extinct Gymnospermic plants.

Ø  First described by Hamshaw Thomas in 1925 from the late Triassic period.

Ø  Caytonia is a berry-like cupules with numerous small seeds.

Examples of Caytoniales

Ø  Leaves: Sagenopteris

Ø  Microsporophylls: Caytonanthus

Ø  Megasporophylls: Caytonia and Gristhorpia

Continue reading

characteristics of glossopteridales

Glossopteridales-General Characteristics (Glossopteris Short Notes)

What is Glossopteris

Glossopteridales General Characteristics
Characteristics of Glossopteridales: Fossil Gymnosperm


Ø  Glossopteridales included an extinct group of seed plants (Gymnosperms).

Ø  They were originated during the Permian period on the Gondwana Continent.

Ø  They became the dominant vegetation in the Permian period.

characteristics of glossopteridales

Ø  They extinct completely by the end of the Triassic period.

Ø  The order name derived from the genus Glossopteris

Ø  Glossopteris is the best-known member of Glossopteridales

Continue reading

Botany lecture notes

Citrus Canker PPT

Plant Science PPT

Citrus Canker PPT
(Symptoms, Causal Organism, Etiology and Control Measures)

Citrus Canker: Symptoms of Citrus Canker, What is the Symptoms and Causal Organism of Citrus Canker Disease, Disease Cycle (Etiology) and Control Measures of Citrus Canker, Economic Loss due to Citrus Canker, Xanthomonas citri. 

Learn more: Lecture Note on Citrus Canker

Lecture Notes  PPT Presentations

Please be patient to load the online PPT preview

You can DOWNLOAD the PPT by clicking on the download link below the preview…

Continue reading