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Gymnosperms
The gymnosperms are seed producing land plants. However, the seeds are not enclosed in fruits. Most of them have now become extinct and only about 900 species are known to be surviving. The living gymnosperms are widely distributed in the cold climates where snow, rather t..
Gymnosperms
The gymnosperms are seed producing land plants. However, the seeds are not enclosed in fruits. Most of them have now become extinct and only about 900 species are known to be surviving. The living gymnosperms are widely distributed in the cold climates where snow, rather than r..
Class Gymnospermae
This group includes the gymnosperms in which seeds are not enclosed in fruits. This class is divided into three families Gnetaceae, Confiraceae and Cycadaceae. fig. 9.2 - Angiosperm Classificati..
This group includes the gymnosperms in which seeds are not enclosed in fruits. This class is divided into three families Gnetaceae, Confiraceae and Cycadaceae. fig. 9.2 - Angiosperm Classificati..Division Gymnospermae
Pinus Gymnosperms are intermediate between cryptogams and angiosperms. The male flower is a cone which produces pollen. The female flower is much larger and consists of a rosette of carpels which bear ovules along the two margins. Example: Cycas, Pinus and Coniferous tre..
Pinus Gymnosperms are intermediate between cryptogams and angiosperms. The male flower is a cone which produces pollen. The female flower is much larger and consists of a rosette of carpels which bear ovules along the two margins. Example: Cycas, Pinus and Coniferous tre..EMBRYOPHYTA (Embryo stage present)
1. BRYOPHYTA (NON VASCULAR) 2. TRACHEOPHYTA (VASCULAR) a) PTERIDOPHYTES b) GYMNOSPERMS c) ANGIOSPERMS fig. 8.24 - Major Plant Grou..
1. BRYOPHYTA (NON VASCULAR) 2. TRACHEOPHYTA (VASCULAR) a) PTERIDOPHYTES b) GYMNOSPERMS c) ANGIOSPERMS fig. 8.24 - Major Plant Grou..Sub Kingdom Phanerogamae
This division is made up of plants that bear flowers and seeds and make up the majority of the larger plants. The body is differentiated into true stem, leaves and roots. Propagation of the plant takes place with the help of seeds. Seeds are formed as a result of sexual reproduction. The male and ..
Kingdom Metaphyta
Kingdom Metaphyta - The kingdom Metaphyta (or the plant kingdom in its true sense) includes all the eukaryotic, multicellular, photosynthetic plants found in this biosphere. It consists of three major groups of plants algae, bryophytes and tracheophytes. The group algae includes primarily aquatic o..
Types of Parenchyma
. It is meant for storage of reserve food. Conjunctive parenchyma is the parenchyma, which occurs in the root system. It is specially meant for storage of water. Armed parenchyma is the parenchyma, which is found in the epidermis of leaves in some gymnosperms. The cells have many spiny pr..
Some Interesting Features
Plants wilt when turgor pressure inside the cells of such tissues go down below zero. Pressure chamber is used for measuring water potential of whole leaves, shoots, etc. The value of osmotic pressure of the soil solution in a well watered soil is less than one atmosphere. Osmotic pressu..
Summary
>The adult plant body is a gametophyte. It contains reproductive structures called antheridia which produces male gametes and archegonia which produces the egg cell. The fertilised egg develops into a sporophyte which remains attached to the gametophyte, leading a parasitic life. The sporophyte pro..
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