Types of Reproduction
Summary - Reproduction is defined as the production of individuals of the same species, that is the next generation of the species. There are basically two types of reproduction - asexual and sexual. Asexual reproduction involves only one parent and the offspring is genetically similar to..
Pinnately Compound Leaf and Palmately Compound Leaf
A pinnately compound leaf is one in which the midrib (rachis) bears laterally a number of leaflets. The arrangement of leaflets is either alternate or opposite. Following types can be recognize..
Leaf Base
Leaf base is the portion by which the leaf is attached to the stem. In monocots the leaf base is of sheathing type. In dicots the leaf base could bear two lateral outgrowths called stipules. In some plants like Pea, bean, etc. the leaf base is swollen and is called pulvinu..
Mendel's Work
Gregor Mendel was the first to carry out scientific studies on transmission of characteristics from the parent to the offspring. He selected garden peas as they showed many contrasting traits that were easy to track through the generations. Moreover, these plants are naturally self-pollinated. This..
Division Bryophyta
Moss and Liverwort belong to this variety of plants. There are the simplest form of land plants. The plant body is flat and lack true leaves and roots. The upper surface of the plant body produces a stalk which bears a capsule. The capsule contains spores. ..
Moss and Liverwort belong to this variety of plants. There are the simplest form of land plants. The plant body is flat and lack true leaves and roots. The upper surface of the plant body produces a stalk which bears a capsule. The capsule contains spores. ..Transfer RNA (tRNA)
It represents about 10 to 15% of the total RNA in the cell. It has the shortest molecule having only about 80 to 100 nucleotides. The polynucleotide chain is folded on itself to have the shape of a cloverleaf. The molecule has three lateral loops, a DHU loop, a t loop and an anticodon loop. The an..
Pollination
The pollen grains which produce the male gametes and the ovules which bear the female gametes are borne on different structures. It therefore becomes necessary that for sexual union to occur, the pollen grains must be transferred to the stigma. The transfer and deposition of pollen grains..
Vegetative Reproduction by Grafting
The other part consists of a small shoot bearing one or more buds and is known as the scion. The union of the stock and the scion is carried out with the help of cambium. The stock supplies the water and minerals to the scion whereas the scion forms the upper portion and supplies the orga..
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..Flagellation
Most of the bacteria contain one to many locomotor structures called flagella. Cocci do not have flagella. Based on the number and mode of attachment of the flagella, bacteria can be distinguished into the following types: I . Atrichous : Bacteria without flagella. II. Trichous: They ..
Most of the bacteria contain one to many locomotor structures called flagella. Cocci do not have flagella. Based on the number and mode of attachment of the flagella, bacteria can be distinguished into the following types: I . Atrichous : Bacteria without flagella. II. Trichous: They ..See what our Users say :
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