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z-coordinate

Explanation:

If a line is parallel to xy plane, perpendicular distance of each and every point on line from xy plane remains.

∵ z-coordinate of a point gives its perpendicular distance from xy plane.

This implies that z-coordinate of every point must remain the same.

x = 0, y = 0.

Explanation:

Let P be an arbitrary point on z-axis. Its locus will give the equation of z - axis

∵ P lies on z-axis and this axis is common to xz and yz planes or we can say that it lies on xz and yz planes.

∴ it’s y and x coordinates are going to be 0 but still it may have any distance form xy axis as it is ⊥ to it.

∴ Co-ordinates of P are of the form (0, 0, z)

Clearly x = 0 and y = 0 together defines any point on z – axis.

∴ locus of P is x = 0 & y = 0 and also the equation of z-axis.

(0,0,z)

Explanation:

∵ P lies on z-axis and this axis is common to xz and yz planes or we can say that it lies on xz and yz planes.

∴ its y and x coordinates are going to be 0 but still it may have any distance form xy axis as it is ⊥ to it.

∴ Co-ordinates of P are of the form (0, 0, z)

On X − axis, the co-ordinates are (3, 0, 0)

On Y − axis, the co-ordinates are (0, 7, 0)

On Z − axis, the co-ordinates are (0, 0, 9)

(i) (-5, 3, 7) Distance of A from XY plane is 7 units 

Distance of B from YZ plane is 5 units 

Distance of C from ZX plane is 3 units

 (ii) (4, -3, -5) Distance of A from XY from XY plane is 5 units 

Distance of B from YZ plane is 4 units 

Distance of C from ZX plane is 3 units

x = 0

Explanation:

∵ x coordinate gives the distance of a point from yz plane.

∴ x = 0 implies that the point lies on yz plane.

Thus, locus of a point for which x = 0 is the yz plane or we can say that equation of yz plane is x = 0.

If the point lies on yz-plane then x-coordinate will be zero.

x-axis

Explanation:

∵ x-axis is perpendicular to yz plane, so it is going to be perpendicular to any plane parallel to yz.

The plane parallel to yz-plane is perpendicular to x-axis.

X and y coordinates of a point are its distance from the origin along or parallel to the horizontal x-axis and y-axis. 

To measure the x and y coordinates, you must move either to the left of the origin or to its right. 

In case of a point on the z-axis, you do not move to the right or to the left of the origin. 

Hence x and y coordinates are 0 for a point on the z-axis.

As y-axis lies on xy plane and yz.

So its distance from xy and yz plane is 0.

∴ By basic definition of 3-D coordinate we can say that x-coordinate and z–coordinate are 0.

∴ any point on Y-axis has x and z coordinate = 0

∴ x = 0 and z = 0 can be considered as the equation of y-axis.

Hence, option(C) is the only correct choice.

Answer is (A) xy and xz 

We know that, on the xy and xz-planes, the line of intersection is x-axis

Answer is (C) z = 0, x = 0 

On the j-axis, x = 0 and z = 0

Answer is (B) Seventh octant

The point (-2, -3, -4) lies in seventh octant

Given,

T_n = 6_n − 7

T₅₀ = 6 × 50 − 7 = 300 − 7 = 293

Correct option is (d) Pia mater

Optic chiasma or crossing of two optic nerves is seen on the anterior side of the hypothalamus.

The upper two lobes of corpora quadrigemina are called superior colliculi which receive impulse from optic nerves while the lower two lobes are called inferior colliculi which receive auditory stimuli. Both colliculi control and coordinate head movements.

300 gm (approx) is the approximate weight of heart of a man.

The respiratory pigment contained in human blood is Haemoglobin.

W.B.C is the human body is protected from invading bacteria.

(i) Transport of nutrients and oxygen to the cells and tissues.

(ii) Removal of CO₂ and nitrogenous wastes from the tissues and carry them to the blood.

(iii) It absorbs fatty acids and glycerol through lacteals.

(iv) It destroys harmful pathogens by its lymphocytes.

(v) It maintains body temperature.

(vi) It regulates protein level in the tissue fluid.

Origin: R.B.Cs. or erythrocytes are minute biconcave disc-like structures, flat in the centre and thick and round at periphery in blood formed in red bone marrow of the long bones and begot bone.

Function: They help in the transportation of oxygen and carbon dioxide to the different parts of body.

The blood plasma from Serum fibrinogen has been removed. 

The functions of blood plasma are:

(a) Transports of digested food from the alimentary canal to tissues.

(b) Transports excretory materials from tissues to excretory organs.

(c) Distributes hormones from the glands to their target site.

(d) Distributes heat in the body to maintain the body temperature.

Iron is present in red blood cells.

Blood plasma: It is transparent fluid part of blood that contains blood corpuscles, fibrinogen and prothrombin.

Serum: It is a transparent fluid secreted from blood clot that do no contain blood corpuscles, fibrinogen and prothrombin.

The circulatory system is also known as transport system because it carries various substances from one organ to another.

The words like' raja','dasa' and 'dasi' are used to describe the people found in the Rig Veda.The raja is the elected ruler of a tribe called jana.He did not have capitals, palaces or armies, nor did they collect taxes. Generally the sons did not automatically succeed fathers as rajas.They managed with voluntary contributions (bali) made by members of the tribe.The raja took decision in consultation with sabha and samiti which were tribal assemblies.There were people who did not perform sacrifices and probably spoke different languages. Later the term came to mean dasa (and the feminine dasi)or slave. Slaves were men and women captured in the war. They were treated as the property of the owners, who could make them do any work they wanted.

The five books on religion are:

In the Rig-Veda people were described in term of the work they did and the language they spoke. In the table below given the names of six people we know, three men and three women. For each of them, mentioned the work they do and the language they speak.

A Song which we have memorized is a song from film Jagriti (1954), sung and written by the legendary poet and singer kavi .We heard and saw this song in film Jagriti, 2-3 times on TV. Also during Independence Day and Republic Day celebrations, this song is very often broadcasted by All India Radio and even telecasted by DoorDarshan on TV.

The circulatory system in human beings consists of heart, blood vessels (arteries, veins  and capillaries) and blood. Blood circulates throughout the body in blood vessels by the  pumping action of the heart. The impure blood is carried by veins from all parts of the  body to the heart. The heart pumps it into the – lungs where blood is oxygenated and  carried back to the heart. From heart, the oxygenated (pure) blood is pumped to all  parts of the body through arteries.  

Thus, the circulatory system forms the transport system carrying food, oxygen, waste  products, nutrients etc. throughout the body.

Sukta - Well-said
Chariots - Used in Battles
Yajna - Sacrifice
Dasa - Slave
Megalith - Stone Boulder

In chapter 3; discussion is mainly on rural people. But in this chapter, the discussion is mainly on urban people. In both the cases; farmers and herders did the same type of work. But their group was much bigger in case of the Harappan cities. Their work could have been more organized; compared to what it was in earlier societies. Farmers and herders (in previous chapter) mainly produced for their own use. But in case of the Harappan cities; the farmers and herders sold their surplus production to craft persons,scribes,and rulers living in cities.

Metals, writing, the wheel and the plough were important for the Harappans in many ways. Metals were used for making various tools, utensils, jeweIlry and seals. Many ornaments were made of gold,silver,copper ,bronze,terracotta and several types of beads. Writing was useful for maintaining the records related to trade and for various other purposes. The wheel was used in carts to ferry people and goods. Wheel was also used as potter’s wheel. Plough was used for tilling the land so that farming could be done.

Copper: Rajasthan
Gold: Karnataka
Tin: Afghanistan
Precious stones: Gujarat

The people of Harappa ate various kinds of grains (rice, wheat, barley, pulses, mustard,sesame,linseed etc.), fruits (ber), fish, meat and milk. Most of these things we eat even today. At present; we eat rice, wheat, pulses, fish, meat and milk. Barley is used barely by us.

F (P,Q,R) = (P' + Q' + R) . (P + Q' R) . (P + Q' R).(P' + Q + R')

OR

F (P,Q,R) = π (0,3,4,5)

Correct option is d. I₃^-

Correct option is d. different with 1, 0 and 2 lone pair of electrons respectively

Correct option is b. BrF₃