Author Archives: I am hassan

Reproductive Shoot Apex

Reproductive Shoot Apex (Floral Apex) The reproductive apex produces a flower or an inflorescence and replaces the vegetative apex. The flowering shoot is considered as homologous to the vegetative shoot. According to Gregoire, the reproductive meristem is structurally different from vegetative meristem. He suggested that reproductive apex consists of a meristematic Mantle and a Core. The two superficial layers of ...

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Types of Gymnosperms

Principal Types of Gymnosperms On the basis of shoot apex three principle types of gymnosperms can be distinguished: The Cycas Type: In this type, three meristematic zones can be distinguished: Surface Meristem: The cells are not uniform in the appearance and divide anticlinally, periclinally and diagonally. The apical initials have been distinguished in the seedlings of Cycas revolute, but not ...

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Plant Anatomy Theories

Plant Anatomy Theories Different theories about plant anatomy and different types of cells playing important role in proper functioning of plant, given by different scientists & botanists accordingly with passage of time are as follow: Apical Cell Theory: According to this theory, in pteridophytes one or more initials are recognized which are responsible for the formation of all the cells ...

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Tissue Types And Tissue System

Tissue Types & Tissue System The tissues, i.e., complex of cells are of two types: Meristematic Tissues: It is a tissue composed of immature, not well differentiated cells which has the capacity of division. Meristems: The term Meristem is derived from a Greek word Meritos meaning Divisible. It emphasizes the cell division activity characteristic of the tissue which bears this ...

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The Cell Wall And Its Structure

­The Cell Wall Cell wall is a characteristic of a plant cell and it distinguishes it from the animal cell. The cell wall is considered as an Ergastic Substance, i.e., secreted by the living substance (protoplasm) but it-self is non-living. The synthesis of cell wall is controlled by Golgi complex. Three layers of cell wall can be distinguished: Middle Lamella: ...

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Plant Anatomy – Internal Organization

Plant Anatomy Internal Organization The plant body is divided into stem, leaf and root. Evolutionary studies suggest that organization of oldest land plant was very simple resembling leafless and rootless Devonian plant, Rhvnia. If seed plants have evolved from these plants then the leaf, the stem and the root would be closely related phylogenetically, ontogcnelieally. The organs have common origin ...

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Cucurbitaceae – Cucurbita maxima (Kadu), Cucurbita Lower Classification

Cucurbita Lower Classification

Cucurbitaceae – Cucurbita maxima (Kadu), Cucurbita Lower Classification The family comprises of 100 genera and 850 species distributed mainly in tropical and sub-tropical regions of the world. Most members are cultivated for their edible fruits. The common are: Cucurbita maxima (Kadu), Luffa cylindrica (Ghia tori), Cucumis sativus (Cucumber), Citrullus vulgaris (Water melon) and momordica charantia (Karela). Distinguish Features of Cucurbita maxima Herbs ...

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Umbelliferae – Coriandrum sativum (Dhaniya)

Umbelliferae – Coriandrum sativum (Dhaniya) Herb with a fistular stem, leaves, alternate, generally compound or much incised, inflorescence a typical compound umbel, flower actinomorphic, hermaphrodite, epigynous, pentamerous, calyx 5 sepals, corolla 5 free petals, stamens 5, bicapillary, inferior ovary. Some important genera are Coriandrum sativum, Carum carvi (kala zera), Cuminum cyminum (Safad zera), Foeniculum vulgare (Saunf). Coriandrum sativum (Dhaniya): Habit: A ...

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Family Fabaceae – Acacia nilotica

Fabaceae (Mimosaceae) The plants of this family almost exclusively tropical or sub-tropical in distribution. The family is represented by about 40 genera. Most members exhibit xeromorphic characteristics. The most common genera are; Acacia nilotica (kikar), mimosa pudica (lajvanti), Prosopis, Albizia lebbeck (shirin), etc. Distinguish Features: Shrubs or tree, pinnate compound leaves, stipules are modified into thorns, inflorescence a spikate, head, ...

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Fabaceae – Cassia fistula

Fabaceae-Caesalpiniaceae The members of the family are distributed in tropical and sub-tropical regions. There are about 135 genera in the family. The most commonly found members of the family are Cassia fistula (amaltas), Bauhinia (kachnar – flowers used as vegetable), Tamarindus (imli), Poinciana (gul-e-mohr), Parkinsonia (vilayati kikar), Saraca indica (ashok) and Caesalpinia. Distinguish Features: Herb, shrubs or tree, paripinnate compound ...

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