Animalia
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Introduction to Biology
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Plantae 2
[mcq id=”6447″ ] Some Important Concepts
Plantae
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Ectocarpus
Occurrence Ectocarpus is a brown alga. It is abundantly found throughout the world in cold waters. A few species occur in fresh waters. The plant grows attached to rocks and stones along coasts. Some species are epiphytes on other algae like members of Fucales and Laminaria. Ectocarpus fasciculatus grows on the fins of certain fish in […]
Batrachospermum
Occurrence Batrachospermum is fresh water alga. It is found in clear, cool and running streams. Deep water plants are dark violet or reddish in colour. But the shallow water species are olive green. The intensity of light changes the colour of pigments. The thallus is attached to the substratum. Vegetative structure Thallus of adult plant […]
Polysiphonia
Occurrence Polysiphonia is a marine alga. It is present along the coast of oceans. It is attached to the rocks or other substratum. Some members are epiphytes. Vegetative structure Plant body is composed of branched filamentous and basal attachment disc. Attachment discs: The basal attachment disc is formed of several unseptate, branched rhizoids. Vertical portion: The […]
Mendel’s law of Independent Assortment
Mendel began working with the pair of characters,those were seed shape and seed color. The cross in which two traits are studied at same time is dihybrid. As we know the monohybrid cross for seed color (Y/y x Y/y), which gave a progeny ratio of 3 yellow:1 green. The seed shape phenotypes were round (determined by allele R) and […]
Chromosomal theory of Inheritance
Historical development of the chromosome theory The theory and practice of genetics took a major step forward in the early part of the twentieth century with the development of the notion that the genes, as identified by Mendel, are parts of specific cellular structures, the chromosomes. This simple concept has become known as the chromosome […]
Vaucheria
Occurrence Majority of them are fresh water. They are also found on moist soil. They form dark green mats. General structure Vegetative structure The thallus is filamentous. The filament is cylindrical, branched, tubular, erect coenocytic. The filament is attached to the substratum by hepteron. Hepteron is colourless branched rhizoid like structure. Filament increases in length […]