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EMBRYOLOGICAL EVIDENCES -
(i) Gill clefts and notochord appear on the embryonic development of all vertebrates from fishes to mammals. (ii) The notochord is replaced by the vertebral column in all adult vertebrates.
(iii) Lungs in adult amphibians, reptiles and mammals replace gills.
(i) Similarly in early development: In all the multicellular animals the fertilized egg (zygote) under goes cleavage to produce morula (solid mass of cells), blastula (a single layered hollow structure) & gastrula.
(ii) Resemblance in vertebrate embryos: The embryos of all vertebrates resemble one another.
(iii) Heart of a mammal or bird is initially two - chambered as in fished and finally becomes four-chambered. (iv) Tadpole of frog resembles to fish shows "ontogeny repeats phylogeny".
Tadpole of frog
There are two main sources of pollution: (1). Natural Sources: (a) Volcanic ash (b) Marsh gas (CH4) released from decay of organic matter.
The Environmental Disasters Are Classified Into Two Major Categories: 1. Natural Disasters like Earthquakes, Tsunami, Landslides, Cyclones, Floods, and Droughts Etc. 2.
Cat scratch disease It is caused by Bortenella henselae, a gram-negative, non-motile bacterium. The organism is found in all parts of the world. The cat is an important reserv
feeding habit of branchiostoma?
CAR E OF EYES - 1. Eyes should be periodically examined in children. 2. While reading the paper should be held 36 cm. away from eyes and preferable at an angle
Q. What is the acrosome of the sperm cell? How is it formed? The acrosome is a structure that contains a great number of digestive enzymes it is formed by the union of Golgi ap
EMERGENC E OF CONTEMPORARY BIOLOGY - 1 . Aristotle (384-322BC) - Greek Classified animal species and arranged them in hierarchies. Formulated 'Great chain of
a) List the a variety of modes of heterotrophic nutrition in plants. b) Define any two modes giving one example of each.
what is the excretory organ in protozoa?
Direction of Energy Flow Now let us consider the first point that is the direction of flow of energy. Energy flows from lower (producer) to higher (herbivore, carnivore, etc.)
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