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Meghna Thapar 5 years, 10 months ago
The human male reproductive system consists of:
- Testes - Are the primary reproductive organs in males which are in pair. These are oval shaped organs which lie outside the abdominal cavity. It makes the male *** cells called sperms and produces male *** hormones called testosterone. The testes are situated in the scrotal sac outside the main body cavity because the formation of sperms requires a lower temperature than the normal body temperature.
- ******* - Is a muscular pouch which houses the testes. It is present outside the abdominal cavity and maintains a lower temperature than the normal body temperature.
- Epididymis - The sperms formed in the testes goes into a coiled tube called epididymis which stores the sperms temporarily.
- Vas Deferens (sperm duct) - It is a long tube which carries the sperms from epididymis to another tube called urethra.
- Seminal vesicles and prostrate gland - Both these glands are present along the path of vas deferens and add their secretions to sperms which allows them to transport easily.
- ***** - It is an organ which passés the sperms from the man's body into the ****** in the women's body during mating.
Posted by Nishant Mathur 5 years, 11 months ago
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Meghna Thapar 5 years, 10 months ago
- Mendeleev’s Periodic Table:
- Mendeleev believed that the atomic mass of an element was the most fundamental property in classifying elements.
- Mendeleev arranged elements in the increasing order of their atomic masses and observed that the elements showed repetition after certain intervals in their physical and chemical properties.
- He arranged the known elements in the increasing order of their atomic masses in horizontal rows, till he encountered an element which had properties similar to the first element.
- Mendeleev placed the element below the first element and started the second row of elements.
- Proceeding in this way, he created the first periodic table containing 63 elements, arranged according to their properties.
Mendeleev’s Periodic Law: The physical and chemical properties of elements are a periodic function of their atomic masses.
Features of Mendeleev’s Periodic Table:
- There are seven horizontal rows in the periodic table, numbered from 1 to 7. These seven rows are called periods.
- There are eight vertical columns numbered from I to VIII. These eight columns are called groups. Groups I to VII are further divided into sub groups A and B.
- The properties of elements in a particular period show regular gradation from left to right.
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Food chain is a succession of organisms in an ecological community that constitutes a continuation of food energy from one organism to another as each consumes a lower member and in turn is preyed upon by a higher member.
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The lymphatic system is the other transport system of human body. It is a complex network of lymphoid organs, lymph nodes, lymph ducts, lymph capillaries and lymph vessels that produce and transport lymph fluid from tissues to the circulatory system.
Lymph is a circulatory fluid like blood. It runs in the lymph capillaries. It is colourless and contains most of the ingredients similar to blood. It does not contain RBC. Lymph mainly contains WBCs and plays an important role in fighting infections. It also contains most of the protiens present in blood. Lymph finally joins into the blood capillaries.
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Posted by Vidushi Saraw 5 years, 11 months ago
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Saponification is the hydrolysis of an ester under acidic or basic conditions to form an alcohol and the salt of a carboxylic acid. Saponification is commonly used to refer to the reaction of a metallic alkali (base) with a fat or oil to form soap.
Example:
Ethanoic acid reacts with alcohols in the presence of a conc. sulphuric acid to form esters.
C2H5OH + CH3COOH → CH3COOC2H5 + H2O
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The following are the various evidences in favour of evolution:
- Homologous organs: Organs with a common basic structural design but with different functions are said to be homologous organ. For example, forelimbs of a frog, lizard, bird and man.
- The forelimbs of man are used for grasping, of lizard for running, of frog for propping up and bird for flying. They have different functions but have same structural pattern.
- Analogous organs: The analogous organs have different basic structure but perform similar functions. For example, the wing of insects and the wing of birds, have a totally different anatomy and origin but they perform the same function of flying in air.
- Evidences from fossils: The fossils also provide evidences for evolution. For example, the fossil Archaeopteryx looks like a bird but it bears a number of other features, which are found in reptiles. This observation provides a clue that birds have evolved from reptiles.
Posted by Rehma Ali 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
H2S + Cl2 → 2HCl + S
The O.N. of S increases from -2 to 0. So it is undergoing oxidation and O.N. of Cl2 decreases from 0 to -1. So it is undergoing reduction. Therefore it is a redox reaction.
CuO + H2 → Cu +H2O
In this redox reaction, CuO is getting reduced to Cu since Oxygen is getting removed. So, the conversion of CuO to Cu is reduction reaction. H2 is getting oxidised to H2O. So, it is oxidation reaction.
Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
Oxidation state of Fe changes from 0 to +2 and oxidation state of Cu changes from +2 to 0
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Molecular phylogeny is how the molecular structures are used for gaining data or information about the evolutionary relationship of an organism.
One of the most common approaches, in this case, is how homologous genetic sequences are compared by using a sequence alignment process.
It helps to identify a similarity which will cover T-Coffee and Clustal W. Mitochondrial DNA data is used by molecular phylogeny for building a “relationship tree” which shows the entire evolution of different organisms.
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Female reproductive structure in a flower: Carpel
Carpel has 3 important parts in a flower
- Ovary
- Basal enclosed part of carpel
- Ovarian cavity is termed as Locule
- Encloses ovule in it
- Ovules are attached to cushion-like structure called Placenta
- Style
- Tube like structure that connects the Ovary & Stigma
- Stigma
- Located at the exposed end of Style
- Acts as the receptive surface for pollen grains
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Chirag Kumar 5 years, 11 months ago
1Thank You