The term magnetic effects of current means the current flowing through a wire creates a magnetic field around it. Hans Christian Oersted discovered the magnetic influence of the current in the year of 1820 and noticed that a wire carrying a current could deflect a magnetic needle.

Accessory reproductive organs are those structures which help in the transfer and meeting of the two kinds of *** cells.

Accessory glands in male reproductive system are:

1. Seminal vesicles

2. Prostate gland

3. Cowper's gland

Seminal vesicles secrete an alkaline medium for the transportation of sperms. The mixture of the fluid and sperms is known as semen. Prostate glands pour its alkaline secretion into the semen to neutralize acid in female ******. Secretion of Cowper’s gland acts as a lubricant.

SELF Help Group are small groups of 15-20 members of rural people in particular women belonging to one neighbouhood who meet and saves regularly. The members of the group can take small loan to meet their needs on low interest rate.
Functioning:

• Most of the decisions regarding the savings and loan activities are taken by the group members.
• The group decides as regards the loans to be granted- the purpose, amount, interest to be
  charged, repayment schedule etc.
• Group is responsible for the repayment of the loan.
• Any case of non-repayment of loan, by any one member is followed up seriously by other members in the group.
• The SHG help borrowers overcome the problem of collateral.
• They provide timely loans for a variety of purposes and at a reasonable interest rate.
• The group provrdes a platform to discuss and act on a variety of social issues such as health, nutrition, domestic violence, etc.

Flow of energy in an ecosystem is as follows. 

• The green plants in a terrestrial ecosystem capture about 1% of the energy of sunlight that falls on their leaves and convert it into food energy. 
• When green plants are eaten by primary consumers, a great deal of energy is lost as heat to the environment, some amount goes into digestion and in doing work and the rest goes towards growth and reproduction. 
• An average of 10% of the food eaten is turned into its own body and made available for the next level of consumers.
• Therefore, 10% can be taken as the average value for the amount of organic matter that is present at each step and reaches the next level of consumers. 
• Since so little energy is available for the next level of consumers, food chains generally consist of only three or four steps. 
• The loss of energy at each step is so great that very little usable energy remains after four trophic levels. 
• There are generally a greater number of individuals at the lower trophic levels of an ecosystem, the greatest number is of the producers.
• The length and complexity of food chains vary greatly. 
• Each organism is generally eaten by two or more other kinds of organisms which in turn are eaten by several other organisms. 
• So instead of a straight line food chain, the relationship can be shown as a series of branching lines called a food web.

Flow of energy is unidirectional because the energy that is captured by the autotrophs does not revert back to the solar input and the energy which passes to the herbivores does not come back to autotrophs. 

As it moves progressively through the various trophic levels it is no longer available to the previous level.

Secondly, the energy available at each trophic level gets diminished progressively due to loss of energy at each level.

a ns w e r 

In human beings,  male produce two types of sperm cells, one is having X- chromosome, while other type is having a Y -chromosome. Females produce ova, all of them having X chromosome. 

The value of B is 0°

Step-by-step explanation:

given sin 2B = 2 sin B

we have to find the value of B

then

hence , The value of B is 0°

Ranga was the first person in village who had gone to Bangalore to study in English. That was why Ranga’s homecoming was a great event. People rushed to his doorstp and wanted to see the boy who had gone to the city for studies. Everyone was surprised to see that Ranga was the same as he had been six months ago, when he had first left their village. He had not lost his caste.
 

Five causes of deforestation in India during the British rule were:

a. The British considered forests as wildernesses which must be brought under cultivation to enhance the income of the state. Thus, large tracts of forest lands were cleared for cultivating land.

b. Due to high demand, forests in Britain were dissapearing. This created a problem for British Royal navy as wood as required to build ships. The British started exploring Indian forests on a massive scale.

c. Forests were destroyed to supply sleepers for railways and to further expand areas under railways.

d. The colonial government thought forests as unproductive and hence cleared them for building dams and layingdown cities.

e. Cash crops were expected to bring huge revenues. So large areas of natural forests were cleared to make way for tea, coffee and rubber plantations. 

In the colonial period, cultivation expanded rapidly for a variety of reasons of which two are given below:
(i) British directly encouraged the production of commercial crops like jute, sugar, wheat, and cotton. The demand for these crops increased in 19th century Europe where foodgrains were needed to feed the growing urban population and raw materials were required for industrial production.
(ii) In the early 19th century the colonial state thought that forests were unproductive. They were considered to be wilderness that had to be brought under cultivation so that the land could yield agricultural products and revenue and enhance the income of the state.

A gas is a substance with no definite volume and no definite shape. Solids and liquids have volumes that do notchange easily. A gas, on the other hand, has a vol- ume that changes to match the volume of its container. The molecules in a gas are very far apart compared with the molecules in a solid or a liquid.

The maximum amount of solute that can dissolve in a known quantity of solvent at a certain temperature is its solubility. A solution is a homogeneous mixture of one or more solutes in a solvent. Sugar cubes added to a cup of tea or coffee is a common example of a solution. The property which helps sugar molecules to dissolve is known as solubility.

ANSWER
The atoms in solid are tightly bound to each other either in a regular geometric lattice like crystalline solids or irregular amorphous solid. This gives it structural rigidity and resistance to changes of shapes or volume.