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In earthworms, when the ovaries mature, the clitellum secretes a viscous substance in the form of a girdle. This girdle hardens in to a cocoon around the clitellum. The ova are discharged into cocoon. When this cocoon moves over the spermathecae openings, the sperms which are already collected from another worm and stored in the spermathecae are discharged into the cocoon. The cocoon finally, comes out of the body and fertilization takes place in the cocoon. As it is taking place outside the body, it is called as "external fertilization".
What makes the cluster of atoms of carboxylic acid functional group an acid? a) a non-polar O-H bond near another electronegative oxygen. b) an ionic O-H bond near another el
Write the chain structure of D galactose and D mannose? The ring form of ribose is a component of ribonucleic acid (RNA). Deoxyribose, which is missing an oxygen at positi
What is the difference between the concepts of food chain and food web? The chain theory is a theoretical model to study the energy flux in ecosystems. In fact, in an ecosystem
human skeleton
Andalusian chickens may be either black, white, or gray. The gene for black is not dominant over the gene for white, nor is the gene for white dominant over the gene for black. Whe
Explain some Guidelines to Help in Use Drugs Wisely? By now, you are aware that the interaction of foods and drugs is a complex problem. Researchers cannot always predict wheth
Infraorbital nerve and vessels The infraorbital nerve exits through the infraorbital foramen. This foramen and the neurovascular contents are within 5 to10mm of extremely resor
CIRCUL A T O R Y SYSTEM IN COCKROACH Type is open or lacunar. i.e. b.v. absent. Organs are dipped in haemolymph. 1 . HAEMOLYMPH - Blood and lymph are mixed.
using an example in each case,describe the three main feeding methods used by animals based on the type of food available
Exterrral and Internal Environment Let us try to understand the concept of environment with some examples. Can you identify the environment of a single carp fish in the pond? It
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