AIIMS AIPMT PMT JIPMER Essential – Primary Secondary Growth and Development of Plant Cells

stages-of-secondary-development-plants

Primary growth is the first form of growth to occur. A whole plant can be built up by primary growth, and in most monocotyledonous plants and herbaceous dicotyledons it is the only type of growth. It is a result of the activity of the apical, and sometimes intercalary meristems. The seedling undergoes primary growth to … Read more AIIMS AIPMT PMT JIPMER Essential – Primary Secondary Growth and Development of Plant Cells

AIIMS PMT AIPMT Essential – Growth & Development in Flowering Plants

An organism starts its life as a single cell. Unicellular organisms grow and reproduce without increasing number of body cells but multicellular organisms undergo a far more complex process of growth and development. GROWTH Growth in an organism consists of a permanent and more or less irreversible increase in size, commonly accompanied by an increase … Read more AIIMS PMT AIPMT Essential – Growth & Development in Flowering Plants

Distinguishing characters of Pteridophytes

Pteridophytes: 1. The life cycle shows distinct heteromorphic alternation of generation. 2. Plant body of Sporophyte is dominant phase. 3. Sporophyte is differentiated into true root, stem and leaves. 4. Vascular tissue i.e xylem and phloem are present. Xylem lacks vessels but tracheids are present. In phloem sieve tubes and companion cells are absent. 5. … Read more Distinguishing characters of Pteridophytes

Pteridophytes

This division includes club mosses, horsetails and ferns. The oldest known pteridophytes are fossils from the end of the silurian period, 380 million years ago. Pteridophyta constitutes the earliest known vascular plants. Vascular plants are those plants that contain the vascular tissue that is the conducting tissues of xylem and phloem. Sometimes all vascular plants … Read more Pteridophytes

Bryophytes

There are fossil records of blue green algae (Cyanobacteria) living 3000 million years ago and many eukaryotic organisms have existed for more than 1000 million years. However the first organisms to colonize the land, primitive plants did so only 420 millions years ago. The greatest simple problem to overcome in making the transition from water … Read more Bryophytes

Algae

In Algae the plant body shows no differentiation into root, stem or leaf or true tissues. Such a plant body is called thallus. They do not have vascular tissues. The sex organs of this group of kingdom plantae are not surrounded by a layer of sterile cells. Algae are autotrophic organisms and they have chlorophyll. … Read more Algae

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