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Q. What is signifying when it is said that beings of the phylum Annelida are vascular beings? From which other phyla of the animal kingdom does this feature differentiate them?
The classification of these beings as vascular beings means that they have a circulatory system, with vessels that distribute substances all through the body.
Poriferans, cnidarians and flatworms do not have a circulatory system. In nematodes there is circulation of nutrients and gases through the pseudocoelom fluid.
Available and Non-available Water You have seen above that water is present even in the apparently dry soils but it is of not much use as far as the plants are concerned. They
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What is genetic engineering? The Genetic engineering is the use of genetic knowledge to artificially manipulate genes: It is one of the fields of biotechnology.
A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the G2?
Q. Concerning events during the periods of life how different is the gametogenesis in men and in women? The formation of spermatogonia in men takes place during the embryonic p
Ooplasmic Determinants and Somatic Cell Determination Eggs of tunicates go through typically mosaic development in which the various blastomeres become determined to follow th
Explain process to Control of Breathing? The rate of breathing is controlled by the medulla, the segment of brain stem just above the spinal cord. If the brain stem is cut just
Which of the following statements is true? Answer Viruses are distinct from cells by the absence of a lipid membrane around them. Viruses are parasites that require the cell's meta
How auxins act helping the lateral (secondary) growth of the stem? The Auxins stimulate the formation of conductive vessels, phloem and xylem, promoting the thickening of the s
Q How different is the amphibian heart from the fish heart? The fish heart has only two chambers, a ventricle and an atrium, and the blood that comes to it is purely venous.
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