About 80 Angiosperms are classified into two groups: Dicots and Monocots Dicotyledons The seeds have two cotyledons (and thus the name). Leaf venation: Reticulate Flower: Tetramerous or Pentamerous (4 or 5 members in each floral whorls) Eg: Pea, Rose, Mustard, Eucalyptus etc. Monocotyledons The seeds have a single cotyledon (and thus the name). Leaf venation: … Read more
The term gymnosperm means ‘naked seeds’ (Greek: gymnos – naked, sperma – seeds). Their seeds do not have any protective enclosure, and thus the name. This is because, in gymnosperms, the ovule is not enclosed by an ovary wall both before and after the fertilization. Therefore a seed that develops after post fertilization remains … Read more
Pteridophyta: Vascular Seedless Plants Pteridophytes are the first terrestrial plants to develop vascular system (Xylem and Phloem). They include horsetails and ferns. Pteridophtes are classified into four groups. Psilopsida – Psilotum Lycopsida – Selaginella, Lycopodium Sphenopsida – Equisetum Pteropsida – Dryopteris, Pteris, Adiantum. Psilotum Selaginella Lycopodium Equisetum Dryopteris Pteris Adiantum Habitat The pteridophytes are usually … Read more
LIVERWORTS Habitat: Liverworts are usually found in moist habitats such as river banks, marshes, wet tree barks, damp soil etc. Morphology: Liverworts have a thalloid structure. The thallus is flat and dorso-ventral. The upper side consists of leaf like structures and the lower side bears numerous rhizoids. Reproduction: Asexual reproduction: Takes place by fragmentation of … Read more
Bryophyta: Non- vascular plants It includes all land plants that do not have true vascular tissue, and are hence called non- vascular plants. They do not have leaves, cones, flowers or roots. But they have rhizoids, which help them to adhere to a substratum. Bryophytes are commonly known as amphibians of the plant kingdom, … Read more
Bryophyta: Non- vascular plants It includes all land plants that do not have true vascular tissue, and are hence called non- vascular plants. They do not have leaves, cones, flowers or roots. But they have rhizoids, which help them to adhere to a substratum. Bryophytes are commonly known as amphibians of the plant kingdom, … Read more
Algae are classified into 3 groups. Chlorophycea The class Chlorophycea is composed of a large group of freshwater green algae. They can be unicellular, colonial or filamentous. They appear grass-green in colour due to the presence of chlorophyll a and b. Some of the common members of this group are Chlamydomonas, Volvox, Ulothrix, Spirogyra and … Read more
Thallophyta: Algae Algae are most primitive of plants. They are photoautotrophs with an less differentiated body. They have a very simple thalloid structure. Their size and form can vary greatly. They can be colonial (eg, Volvox) or filamentous (Ulothrix, Spirogyra etc). Others can be very large as seaweeds (eg. Kelps). Volvox Spirogyra Ulothrix Kelps Habitat … Read more
Thallophyta: Algae Algae are most primitive of plants. They are photoautotrophs with an less differentiated body. They have a very simple thalloid structure. Their size and form can vary greatly. They can be colonial (eg, Volvox) or filamentous (Ulothrix, Spirogyra etc). Others can be very large as seaweeds (eg. Kelps). Volvox Spirogyra Ulothrix Kelps Habitat … Read more
Classification refers to the orderly arrangement of organisms, based on their similarities and differences. The process of classifying plants had been practiced even in the ancient times. The main classification systems used in plants were: Artificial Classification: It is the first and the oldest system of plant classification. It was based on one or a … Read more