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GYMNOSPERM
• tap roots
• naked seeds🌰
• thick cuticle & sunken stomats also reduce water loss
• unlike pteridophytes, these have not an independent free living existence.
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NEET Short Notes
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NEET Short Notes
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NEET Biology Quiz Class 11 1:- The Living World - click here 2:- Biological Classification - click here 3:- Plant Kingdom - click here 4:- Animal Kingdom - click here 5:- Morphology of flowering plants - click here 6:- Anatomy of flowering plants - click here 7:- Cell: the unit of life - click here 8:- Biomolecules Quiz - click here 9:- Cell Cycle and cell division - click here 10:- Transport in Plants - click here 11:- Structural organisation in Animals - click here 12:- Mineral nutrition - click here 13:- Photosynthesis in higher plants - click here 14:- Respiration in plants - click here 15:- Plant Growth and development - click here 16:- Digestion and Absorption - click here 17:- Breathing and Exchange of Gases - click here 18:- Body fluids and circulation - click here 19:- Excretory products and their elimination - click here 20:- Locomotion and Movement - click here 21:- Neural Control and Coordination - click here 22:- Chemical Coordination and Integration - click here…
🎯🎯 Points to remember🎯🎯
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1. Triple helical model of collagen was given by G.N. Ramachandran
2. Ramachandran was influenced by Linus Pauling
3. Darwin was influenced by Malthus
4. P. Maheshwari was influenced by Dr. W. Dudegon
5. a- helix & b- sheet structures was published by Linus Pauling
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1. Anton von Leeuwenhoek first saw & described a live cell.
2. Cell theory was given by Schleiden & Schwann.
3. Cell theory was modified by Rodolf Virchow (1855)
4. Fluid mosaic model was given by Singer & Nicholson(1972)
5. G.B. discovered by Camillo Golgi (1898)
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🌀Notes on Special Theory of Relativity:-
Frame of reference:- A system of coordinates whose axes can be suitably chosen is said to be a frame of reference.
Inertial frame:- A frame of reference either at rest or moving with a uniform velocity (zero acceleration) is known as inertial frame.
Non-inertial or accelerated frame:- It is a frame of reference which is either having a uniform linear acceleration or is being rotated with a uniform speed.
Galilean transformation:-
(a) Transformation of position:-
x' = x – vt
y' = y
z' = z
t' = t
Inverse transformation,
x = x'+ vt '
y = y'
z = z'
t = t'
(b) Transformation of distance:-
l ' = l
Here, l = x2-x1 is the length of rod as observed in frame S.
Anything which remains unchanged when observed from the two Galilean frames of reference is known as Galilean invariant.
(c) Transformation of velocity:-
u'= u– v
Inverse transformation:- u = u'+ v
(d) Transformation of acceleration:-
a' = a
Thus, the acceleration of body, as observed by two observers siting in two inertial frames, is same. Hence, acceleration is said to be Galilean invariant.
Law of conservation of momentum:-
It states that the total momentum of an isolated system (no external force) always remains constant.
In S frame:- m1u1 + m2u2 = m1v1 + m2v2
In S ' frame:- m1u'1 + m2 u'2 = m1 v'1 + m2 v'2
Thus, the law of conservation of momentum is valid in S ' also, indicating that the law is Galilean invariant.
Ether and velocity of light:- c' = c ±v
Postulates of special theory of relativity:-
(a) The laws of physical phenomenon are same when stated in terms of two systems of reference in uniform translator motion relative to each other.
(b) The velocity of light in vacuum is constant, independent not only of the direction of propagation but also of the relative velocity of the source and the observer.
Lorentz transformation equations:-
x' = [x - vt]/√[1- v2/c2]
y'= y
z'= z
t' = [t – [(v/c 2) x]]/√[1- v2/c2]
Lorentz inverse transformation equations:-
x= [x' + vt] /√[1- v2/c2]
y = y'
z= z'
t= [t' + [(v/c 2) x']]/√[1- v2/c2]
Length contraction:-
l = l0√[1- v2/c2]
So, l<l0
Here, l0 is the proper or original length in S frame and l is the relativistic length in S' frame.
Time Dilation:-
??t = ??t0/√ [1-v2/c2]
So, ?t > ??t0
Here, ??t0 is the proper or original time in S frame and ?t is the relativistic time in S' frame.
?Thus, the time interval as observed by the moving observer appears to be lengthened.
Frequency:- If f 0 is the natural frequency of a process in frame S, then the frequency f as observed from S ' given by,
f = f0√[1- v2/c2]
Relativistic velocity addition theorem:-
ux' = [ux – v]/[1- [(v/c2)ux]]
uy' = [uy√[1- v2/c2]]/[1- [(v/c2)ux]]
uz' = [uz√[1- v2/c2]]/[1- [(v/c2)ux]]
Relativistic variation of mass:-
m= m0/√[1-v2/c2]
Rest mass energy:-
E0 = m0c2
Total energy (Mass-Energy Equivalence):-
E= mc2 = [m0/√[1-v2/c2]] c2
Kinetic energy:-
EK= E - E0 = (m - m0) c2
Here c is the speed of light, m0 is the rest mass and m is the relativistic mass.
Relativistic momentum:-
p= mv
= [m0/√[1-v2/c2]] v
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Reaction Between Aluminum and Bromine
The reaction begins and builds up heat. This heat causes the aluminum to melt and float on top of the liquid bromine (which is producing a cloud of vapor because the heat is also boiling it). Wherever the two elements meet, sparks, heat, and light are given off.
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