Comparative embryology is the branch of embryology that compares and contrasts embryos of different species. It is used to show how all animals are related.
D. Metaphase
Always remember M in Metaphase stands for Middle, Middle on the cell!
Answer:
Extremophiles are a relatively small group of bacteria that thrive in extreme conditions. An example is Picrophilus torridus
Pathogenic bacteria are the bacteria which cause diseases.
Eubacteria are classified into Chlamydias, Cyanobacteria,Gram-positive bacteria, Proteobacteria, and Spirochetes.
The spherical shape Bacteria is called cocci , the rod shape bacteria is called bacilli and the spiral shape bacteria is called spirilla
Let us look at the what, why and how of studying extreme places like the deep earth and the deep space. Scientists need to figure out as to 'what' they want to look at such places, be it a new exotic creature or bio-genesis (birth of life). Unless there are several testable hypothesis constructed, such a study cannot begin. The 'why' aspect deals with the purpose of such research and expeditions. Is it of any use to the humans, or will it improve our current understanding of a phenomenon? The 'how' aspect deals with the technology and the economic assistance that can help in undertaking such a research. All these are the challenges that needed to be thoroughly considered to make such a research or expedition possible.
Answer:
Chlorophyll is a green pigment found in chloroplast in plants. It absorbs sunlight during the process of photosynthesis. It is a chelate molecule. In a chelate molecule a central metal ion forms bonds with a large organic molecule made of carbon, hydrogen and other elements like nitrogen or oxygen.
In chlorophyll, magnesium is the central metal ion and it is bonded to a large organic molecule called as porphyrin. Porphyrin constitutes four nitrogen atoms to which the central magnesium is bonded in square planar arrangement. Since chlorophyll is responsible for the green color of the leaves, more the green color more the chlorophyll content and more is the nitrogen content. Hence, chlorophyll meter measures this green light and finds out if the plant needs more or less nitrogen.
