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Give two examples in each case of (a) continuous, (b) discontinuous variation in human populations.
a) Continuous variation: for example, weight, height, intelligence, hair colour, skin colour, physique, blood pressure (any two).
b) Discontinuous variation: blood group, sex, eye colour (more or less), presence or absence of particular genetic diseases (e.g. albinism, haemophilia), free or attached ear lobes (any two).
Describe cytokinesis in a plant cell. Vesicles produced by the Golgi apparatus fuse at the midline of the cell to form the cell plate, a cell wall that elongates to divide th
Endothelium - Ovule In plants bearing unitegmic ovules, the nucellus degenerates during early stages of ovule development and the embryo sac comes in contact with the innermos
Q. What are the segments that form the body of the tapeworm called? What is their function? The body of the tapeworm is made of segments called as proglottids. The proglottids
Mitochondria, which fuel life's processes in all cells, uses nutrients from digested food and oxygen which has diffused across cell surface. In freshwater protozoans water expulsio
What is the special characteristic of (a) stem cells, (b) embryonic stem cells? (a) Stem cells can continue to divide throughout their life. (b)The special characteristic of
What benefit does the sea anemone get in the sea anemone-hermit crab facultative mutualism? Give an alternative term for this part of mutualism. Name the nitrogenous wast
The improper handling and transfer of the solid wastes results in various health and environmental hazards, such as: 1. Spoilage of landscape: Municipal wastes heap up o
Q. Explain Degradation of Fats? Fats are the esters of glycerol and fatty acids and are called as 'glycerides'. Fats are susceptable to hydrolysis, oxidation and other che
Effects of Noise - Noise Pollution Noise can affect in the following three ways: Interferes with communication, Diminishes hearing and Affects health and even
Tantalum and Niobium in alloplastic implant materials Tantalum has been used successfully in needle type, screw- type and double-bladed implants. However, both are difficult
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