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MULTIPLE CHOICE QUESTIONS OF GYMNOSPERMS MULTIPLE CHOICE QUESTIONS OF GYMNOSPERMS 1. Which of the followings is correct for vascular bundle of gymnosperms? (a) Stele (b) Exarch (c) Collateral (d) Conjoint 2. Secondary growth occurs by the activity of: (a) Phloem (c) Xylem (c) Cambium (d) Bark 3. Which of the followings is absent in the xylem of gymnosperms? (a) Trachieds ...

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Carrot Family Apiaceae (Umbelliferae)

Diagnostic characters Habits: Annual or perennial herbs rarely shrubs. Roots: Tap root, branched, sometimes, tuberous due to presence of stored food. Stem: Herbaceous stem, erect or prostate with swollen nodes. Leaves: Petiolate, Alternate, simple, exstipulate, reticulate venation. Usually sheathing at the base. Inflorescence: Cymose, umbel (old name of family Umbelliferae derive from umbel), simple or compound. Umbel is surrounded by ...

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Morphology of Plants – The Stem

The Stem The main stem is the portion of the primary axis of the plant which develops from the plumule axis. An axis, together with the leaves which it bears, is called a shoot. A branch is also a shoot, for it consists of an elongation axis or stem with its own set of leaves. Characteristics of Stem The stem ...

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Morphology Of Plants – The Roots

The Roots The root may be defined as the cylindrical plant organ which is devoid of chlorophyll, bearing no buds or leaves, and tending to grow downwards away from light. It is covered at its tip by the root-cap it bears fine, delicate hairs, the root-hairs which absorb water from the soil.  Types of Roots Roots may be classified into two ...

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Binomial Nomenclature Of Plants

Binomial Nomenclature  Plant Nomenclature: The assignment of scientific names to plants is called Nomenclature. Name is one of the most important ways of identifying an object. Names maybe common, proper, abstract or collective. Our choice of names for individuals is generally arbitrary, however, it imbibes a great influence of language, religion, culture and tradition. Since due to wide application and ...

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Characteristics Of Natural Wood

        Characteristics Of Natural  Wood Wood is a I–41 fibrous tissue found in many plants. It has been used for centuries ice noth fuel and as a construction material. It is composed of 2 natural composite of cellulose fibers (which are strong in tensio .) embedded in a matrix of lignin. Lignin resists compression. W md is ...

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Nature of the Endosperm in Angiosperms

Nature of the Endosperm in Angiosperms   Nature of the Endosperm in Angiosperms Nemec (1910), brink and Copper (1947), suggested that fusion of second male gamete with the polar nuclei serve two functions: It stimulates the development of endosperm. It helps in the formation of the tissue which is physiologically more suitable for the nourishment of the embryo. Thus, it ...

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Development of Monocot Embryo of Angiosperms

Development of Monocot Embryo of Angiosperms (Sagittaris sagittifolis) Development of Monocot Embryo The oospore divides to form a Proembryo which is a filament consisting of three cells, a large Basal Cell, a Middle Cell and a Terminal Cell. The basal cell is present towards micropylar end. It enlarges in size forming most of the suspensor. The middle cell divides repeatedly ...

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Double Fertilization In Angiosperms And Explain Development of Dicot Embryo

Fertilization In Angiosperms

Double Fertilization In Angiosperms – Describe the Process of Fertilization in Angiosperms and Development of embryo in Dicot Also Define Syngamy and Sheperd’s Purse Double fertilization in angiosperms takes place by the pollen tube entering into the embryo sac, after entering it bursts and during this process one of the synergids is also destroyed. The tube nucleus disintegrates. One of the male gametes ...

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Development of Microsporophyll and Microsporogenesis in Angiosperms

Development of Microsporophyll

Development of Microsporophyll of Angiosperms – Describe Microsporogenesis in Angiosperms Development of microsporophyll involves the arise of stamen as a small papillate outgrowth of meristematic tissue from the growing tip of floral primordium. It grows actively and is differentiated into an apical border portion, the anther and a lower slender part, the Filament. The transverse section of a very young anther shows ...

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