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Q. Describe Palynological Evidence?
Palynology is the study of pollen and spores. The taxonomic characters of pollen grains include wall structure, polarity, symmetry, shape and grain size. In angiosperms pollen grains are of two kinds viz. Monocolpate and tricolpate. Monocotpate pollen grains are boat shaped, have one long germinal furrow and one germinal aperture. This is characteristic of primitive dicotyledons and majority of monowtyledons. According to some palynologists the first flowering plants had monocolpate pollen grains. Tricolpate grains are globose, symmetrical, have three germinal apertures and are characteristic of advanced dicotyledons.
Q. Does the fish heart pump venous or arterial blood? After oxygenation in the gills the arterial blood goes to the tissues so the fish heart pumps venous blood, the venous blo
discuss why obelia is considered to be of special interest in zoology as an animal showing an intermediate grade of organisation
15 character of protozoa
Define Regulation of Water Balance For the kidneys? The kidneys are highly efficient conservators of body water. Although the kidneys filter 180 L of blood per day (125 ml / mi
What is Imbibition The ability of colloids to pick up water and swell when they come in contact with water is called imbibition. Imbibition is usually accompanied by the evo
trycocyst
Telophase This is the final stage of mitosis in which the mitotic spindle disappears and each polar chromosomal group is reconstituted into a daughter nucleus, A nuc
Explain Defensive Proteins These proteins protect against diseases. Antibodies are the example of defensive proteins. These combat bacteria and viruses. Also, immunoglobulins,
Q. Write in 3-4 lines about the term belief? Beliefs are learned by us when we were young. These include religious beliefs and beliefs about behaviour. Some beliefs lead to hea
Three point charges are located at the corners of an equilateral triangle as in the figure below. Find the magnitude and direction of the net electric force on the 1.40 µC charge.
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