The importance of tides are:

• They can cause a change in landforms of the Earth. While they can destroy coastlines, they also help in the formation of creeks and inlets.

   

• Strong tides help in the building of lower flood plains of rivers. These are very fertile.

   

• Since the debris is swept away by tides, they help to keep the harbours clean.

   

• In cold countries, tides bring in salt water to the shore and their continuous movement prevents the harbour from becoming ice bound.

   

• The low lying areas of the sea coast during high tides trap water which is used for the manufacturing of salt. In India, along the west coast, salt is manufactured in this manner.

   

• The alternate rise and fall of the tides help the fisherman to sail out and return back to the coast with the tides.

   

• Tidal energy is fast becoming an important non conventional source of energy. They are used in the production of electricity along the Gulf of Kutch and in the state of Gujarat.

   

We know that, Three lines are said to be concurrent, if they pass through a common point which also means that the point of intersection of any two lines always lies on the third line.

Now, the three given equations of line are:

2x + y − 3 = 0 ... (1)

5x + ky − 3 = 0 ... (2)

and 3x − y − 2 = 0 ... (3)

Firstly, we will solve the equations (1) and (3) and find out the value of x and y. The corresponding value of x and y will also satisfy the equation (2) as all the given lines are concurrent.

Therefore, on adding (1) and (3), we get

2x + y − 3 + 3x − y − 2 = 0

⇒ 5x - 5 = 0

⇒ x = 1

On putting value of x in (1), we get

2(1) + y − 3 =0

⇒ y - 1 = 0

⇒ y = 1

So, the point of intersection of two lines is (1, 1).

Now, this point will also satisfy the equation (2).

Therefore, on putting (x, y) = (1, 1) in (2), we get

5(1) + k(1) − 3 = 0

⇒ k + 2 = 0

⇒ k = - 2

Rightward shift in PPC indicates either advancement of technology or increase in the availability of the resources. increase in resources or improvement in technology.

A coach organises amateur and professional athletes and teaches them the fundamentals of a sport. To become a sports coach the qualification required is 12th pass with Physical Education as of one the majors.  Thorough knowledge of sports is required to be a coach and the skill sets required are:  (a) Expert at playing any particular sports  (b) Good organisational skill and be supportive  (c) Leadership qualities with endearing attitude  (d) Good communication skills to boost students  (e) Good analytical skills  (f) Great physical stamina, aware of techniques to be fit  To pursue a career as coach in sports, the requirement is to be a senior or former player in any particular sports. Some institute also offers diploma course in sports coaching after graduation preferablyerably in sports subject. A well accomplished coach can open his academy for coaching. Most coaches worked for educational institutions, including high schools and colleges. Others work for community organisations. Professional teams also employ coaches.Read more on Sarthaks.com - https://www.sarthaks.com/216964/elucidate-the-coaching-career-in-detail

• Prehistory: Time period in the past when there was no paper or the written word and hence no books or written accounts of events. Information about such an age is obtained from excavations which reveal paintings, pottery, habitat, etc.
• Drawings and paintings were the oldest form of artistic expression practised by humans. Reasons for such drawings: Either to decorate their homes or/and to keep a journal of events in their lives.
• Lower and Middle Palaeolithic Periods have not shown any evidence of artworks so far. The Upper Palaeolithic Age shows a lot of artistic activities.
• Earliest paintings in India are from the Upper Palaeolithic Age.
• The first discovery of rock paintings in the world was made in India by archaeologist Archibald Carlleyle in 1867 – 68 (in Sohagighat, Mirzapur District, Uttar Pradesh).
• Rock paintings have been found in the walls of caves at Madhya Pradesh, Andhra Pradesh, Uttar Pradesh, Bihar and Karnataka, some in the Kumaon Hills of Uttarakhand.
• Paintings at the rock shelters at Lakhudiyar on the banks of the Suyal River (Uttarakhand) –

1. 3 categories of paintings: man, animal and geometric patterns in black, white and red ochre.
2. Humans in stick-like forms, a long-snouted animal, a fox, a multiple-legged lizard, wavy lines, groups of dots and rectangle-filled geometric designs, hand-linked dancing humans.

• Paintings in Kupgallu (Telangana), Piklihal and Tekkalkota (both in Karnataka)

1. Mostly in white and red ochre.
2. Subjects are bulls, sambhars, elephants, sheep, gazelles, goats, horses, stylised humans and tridents.

• Paintings in the Vindhya ranges at Madhya Pradesh extending into Uttar Pradesh –

1. About 500 rock shelters at Bhimbetka in the Vindhya Hills at Madhya Pradesh.
2. Images of hunting, dancing, music, elephant and horse riders, honey collection, animal fighting, decoration of bodies, household scenes, etc.
3. Bhimbetka drawings can be categorised into 7 Periods.
   1. Period I: Upper Palaeolithic
   2. Period II: Mesolithic
   3. Period III: Chalcolithic

• Two major sites of prehistoric rock/cave paintings in India: Bhimbetka Caves and Jogimara Caves (Amarnath, Madhya Pradesh).

Any two of these : Potential investors, creditors, lenders, employee unions, customers, government etc.

The Parliament consists of two houses i.e. Lol Sabha and Rajya Sabha. The Lok Sabha is the lower house with a maximum strength of 552 members, out of which 530 members represent the State, 20 members represent the Union Territories and 2 members from the Anglo-Indian community. 

The important functions of the Lok Sabha are:

1) Legislative Function: The primary function of Parliament is a law making function. Lok Sabha plays an important part. It can pass bills concerning to all those subject which have been included in Union and Concurrent list. No bill can become law unless it has been passed by Lok Sabha. In case of any disagreement between the two Houses, the will of Lok Sabha will prevail in joint sitting with the Rajya Sabha because Lok Sabha has more members than Rajya Sabha.

2) Financial Power: The power of control over the finances by the Lok Sabha is powerful. The money bill has to be introduced in the Lok Sabha first, and when passed by the Lok Sabha it is to be transmitted to Rajya Sabha for the recommendation. It is upon the Lok Sabha to accept or not to accepts the recommendations. The Lok Sabah alone has the exclusive power of sanctioning all government expenditures.

3) Executive Control: The Constitution provides that ' Council of Ministers are collectively responsible to the Lok Sabha.' Thus, the Government is accountable to the Lok Sabha for its acts. It is only the Lok Sabha which can pass a no-confidence vote against the Council of Ministers and force them to resign. 

4) Electoral Function: The Lok Sabha members are part of the electoral college for the election of President. The members of Lok Sabha also elect the Vice-President. It elects the Speaker and Deputy Speaker. 

There are more other functions of the Lok Sabha like redressal of grievances, judicial functions and miscellaneous functions.