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The latest Messages 16
2021-08-04 17:22:52
#ONESHOT #Waves #Quick_Revision
523 views14:22
2021-08-04 11:47:07
#imp #ROLLING_MOTION
691 views08:47
2021-08-04 11:46:30
#imp #electrochemical_series
669 views08:46
2021-08-04 07:35:46
#mindmap
810 views04:35
2021-08-03 19:47:28
#NEET PREVIOUS YEAR QUESTIONS #ANALYSIS
SUBJECT - CHEMISTRY
975 views16:47
2021-08-03 17:07:18
#Important Points #FROMNCERT
1. (i) National Forest Policy revised in – 1988.
(ii) Biodiversity act of India was passed by the Parliament in the year-2002
(iii) Forest Act–1927
.
(iv) Biosphere Reserve Scheme– 1986
2. Wild life protection act 1972 (Revised in 1991) :
Ex-situ conservation –The protection of wild life in zoos and botanical gardens. Other e.g., of Ex-situ conservation are gene banks, germ plasm bank, seed bank.
In situ conservation - is the protection of species (wild life) in their natural habitat or National parks or Biosphere reserve or Sanctuaries or Sacred groves
947 viewsedited 14:07
2021-08-03 16:14:42
#NEET PREVIOUS YEAR QUESTIONS #ANALYSIS
SUBJECT - PHYSICS
938 views13:14
2021-08-03 12:08:36
#NEET PREVIOUS YEAR QUESTIONS #ANALYSIS
SUBJECT - BIOLOGY
993 views09:08
2021-08-03 10:19:20
.#MOSTimp Formulas related to distance, displacement, velocity and accelration
d = vt
d = at²
d = (vf + vi/2) ×t
d = 5t² (for distance in 'n' seconds)
d = 5(2tn - 1) (for distance in 'nth' second)
d = 1/2 mv²/F
d = vit + 5t²
d = v × underroot 2H/g
d = vt = x°wt = x°2pi/T × t = x°2pift
x = x° Sin wt
x = x° Sin (underroot k/m) t
vf = vi + at
2as = vf² - vi²
2as = (vi + at)² - vi²
2as = vf² - (vf - at) ²
v = underroot Vfx² + Vfy²
v = Power/Force
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v = 2×K.E/momentum (k.e = 1/2 Pv)
v² = 2×Power×time/mass (P = mv²/2t)
v = underroot 2as
v = underroot gr (speed at highest point in a verticle circle)
v = underroot 5gr (speed at lowest point in a verticle circle)
v² = 2FS/m
v² = 2E/m
v² = 2Ve/m
v = eBr/m (velocity of particle under action of magnetic force along circular path)
v² = Force/Area.Density
v = w underroot x°² - x²
v = underroot k/m × underroot x°² - x²
v = x°w (at mean position where x=0)
v = x° underoot k/m
v = v° underroot 1 - x²/x°² (for determining ratio b/w inst. Velocity and maxi. Velocity)
v= x°2pif = x°2pi/T
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a = x°w² = x°w.w = vw = v.2pif
Common velocity = m1v1/m1+m2
vi² = Rg/Sin2theta
v = underoot Tension×length/mass
V = 2pi ke²/nh (speed of e- in nth orbit)
Vn = V/n
v = nh/2pimr (lambda = 2pir and lambda=h/p)
ma = kx
a = kx/m (SHM)
a = - gx/l (Simple pendulum)
ac = v²/r
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. Formulas related to wavelength 'w'
w = v/f
w = 1/wave number
w1 = 2l (when pipe is opened at both ends)
w1 = 4l (when pipe is opened at one end)
Delta w = Us/f (doppler shift)
Wavelength for obs. = w - delta w = v/f - Us/f
w = hc/Ve
w = hc/E
w = h/mv
w = h/P as P = underroot 2mE so
w = h/underroot 2mE (de Broglie wavelength)
w = underroot 150/V A° (short method for de Broglie wavelength. This formula is applicable only for e-)
1/w = RH (1/p²-1/n²)
Wmaxi/Wmini = n²/n²-p² (for determining ratio b/w maxi. Wavelength to mini. Wavelength for series of atomic spectrum)
w = 2pir/n (n is no. of loops in a circle)
h/mv = 2pir
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919 views07:19
2021-08-03 07:46:13
#MOSTimp POINTS #𝗔𝗡𝗔𝗧𝗢𝗠𝗬 𝗢𝗙 𝗖𝗢𝗖𝗞𝗥𝗢𝗔𝗖𝗛 #NCERT
The alimentary canal present in the body cavity is divided into three regions: foregut, midgut and hindgut.
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The mouth opens into a short tubular pharynx, leading to a narrow tubular passage called oesophagus, opens into a sac like structure called crop.
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Crop has an outer layer of thick circular muscles and thick inner culicle forming six highly chitinous plate called teeth.
A ring of 6-8 blind tubules called hepatic or gastric caecae is present at the junction of foregut and midgut, which secrete digestive juice.
At the junction of midgut and hindgut is present another ring of 100-150 yellow coloured thin filamentous Malphigian tubules.
Hindgut is differentiated into ileum, colon and rectum and the rectum opens out through anus.
Blood vascular system of cockroach is an open type and blood vessels open into haemolymph.
The haemolymph is composed of colourless plasma and haemocytes.
The respiratory system consists of a network of trachea, that open through 10 pairs of small holes called
The opening of the spiracles is regulated by the sphincters and exchange of gases take place at the tracheoles by diffusion
.
Excretion is performed by Malpighian tubules, which are lined by glandular and ciliated cells and absorb nitrogenous waste products and convert them into uric acid, hence the organism is uricotelic
The nervous system of cockroach consists of a series of fused, segmentally arranged ganglia.
The brain is represented by supra-oesophageal ganglion which supplies nerves to antennae and compound eyes
The sense organs are antennae, eyes, maxillary palps, labial palps, anal cerci, etc.
Each eye consists of about 2000 hexagonal ommatidia, due to a cockroach can receive several images of an object, which is known as mosaic vision or nocturnal vision.
Male reproductive system consists of a pair of testes lying one on each lateral side in the 4th-6th abdominal segments.
From each testis arises a thin vas deferens, which opens into ejaculatory duct through seminal vesicle and the ejaculatory duct opens into male gonopore situated ventral to anus.
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In the 6th-7th abdominal segments there is an accessory reproductive gland.
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The sperms are stored in the seminal vesicles and are glued together to form spermatophores
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The female reproductive system consists of two large ovaries in the 2nd – 6th abdominal segments.
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Each ovary is formed of a group of eight ovarian tubules or ovarioles, containing a chain of developing ova.
Oviducts of each ovary unite into a single median oviduct.
Sperms are transferred through spermatophores.
Their fertilized eggs are encased in dark reddish to blackish brown capsule called oothecae.
The development of P. americana is paurometabolous, in which development takes place through nymphal stage.
★彡･:*:･☆彡･:*:･★彡:*:･★彡･:*:･☆彡･:*:･
907 viewsedited 04:46
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