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Question

1.What is Chemosynthetic mode of nutrition ?

2.What is posterior end of dinoflagellates?

3.What is Centromeres?

4.What is Spindle?

5.What is Cytoplasmic microtubles?

6.What is Chromatids?

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Solution

1. A type of autotrophic nutrition in which organisms (called chemoautotrophs) synthesize organic materials using energy derived from the oxidation of inorganic chemicals, rather than from sunlight.

2.A transverse groove, the so-called cingulum (or cingulum) runs around the cell, thus dividing it into an anterior (episoma) and posterior (hyposoma). If and only if a theca is present, the parts are called epitheca and hypotheca, respectively. Posteriorly, starting from the transverse groove, there is a longitudinal furrow called the sulcus. The transverse flagellum strikes in the cingulum, the longitudinal flagellum in the sulcus.

3.A centromere is a constricted region of a chromosome that separates it into a short arm (p) and a long arm.

4..The spindle fibres are microfibrillar structures formed by the centrioles, that pull the chromatids separate during cell division.

5.Microtubule is a polymer of globular tubulin subunits, which are arranged in a cylindrical tube. It is one of the components of the cytoskeleton.

6.Chromatids- These are the two identical halves of the chromosomes which are held together at a point known as centromere.


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