The guts of various ruminants contain _________
Anonymous Quiz
16%
a.Acidophiles
18%
b.Halophiles
48%
c.Methanogens
19%
d.All of the above
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✅Very important points - Human Reproduction
🌟Uterus also called womb.
🌟 Longest unstripped muscles of the body are found in the walls of uterus. (During pregnancy)
🌟 Clitoris is a homologous to the penis in the male.
🌟 Bartholin Glands : It is homologous to Cowper's gland of male
🌟 A functional mammary gland is characteristic of all female mammals.
🌟 The milk produced during the initial few days of lactation is called colostrum which contains antibodies (IgA) absolutely essential to develop resistance for the new-born babies.
⚡️ Liberation of sperms from Sertoli cells of seminiferous tubules is called spermiation.
⚡️ Liberation of sperms from testes is called semination.
⚡️ Liberation of sperms from body of male is called ejaculation .
⚡️ Mammalian sperms are transfered to vagina of female by the process called insemination.
⚡️ In 1 ml of semen, 20 to 120 millions of sperms are present in human being.
⚡️ Leydig's cells mature at 10 yrs. of age.
⚡️ In humans (and most vertebrates), the first polar body does not undergo meiosis II.
⚡️ The first polar body is, therefore, formed merely to get rid of unwanted chromosomes.
🌟Uterus also called womb.
🌟 Longest unstripped muscles of the body are found in the walls of uterus. (During pregnancy)
🌟 Clitoris is a homologous to the penis in the male.
🌟 Bartholin Glands : It is homologous to Cowper's gland of male
🌟 A functional mammary gland is characteristic of all female mammals.
🌟 The milk produced during the initial few days of lactation is called colostrum which contains antibodies (IgA) absolutely essential to develop resistance for the new-born babies.
⚡️ Liberation of sperms from Sertoli cells of seminiferous tubules is called spermiation.
⚡️ Liberation of sperms from testes is called semination.
⚡️ Liberation of sperms from body of male is called ejaculation .
⚡️ Mammalian sperms are transfered to vagina of female by the process called insemination.
⚡️ In 1 ml of semen, 20 to 120 millions of sperms are present in human being.
⚡️ Leydig's cells mature at 10 yrs. of age.
⚡️ In humans (and most vertebrates), the first polar body does not undergo meiosis II.
⚡️ The first polar body is, therefore, formed merely to get rid of unwanted chromosomes.
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Which of the following gives the polarity of the induced emf?
Anonymous Quiz
19%
Biot-Savart Law
54%
Lenz’s Law
15%
Ampere’s circuital Law
11%
Fleming’s right-hand Rule
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Electrical Inertia is the measure of?
Anonymous Quiz
35%
Self Inductance
28%
Mutual Inductance
29%
Impedance
8%
None of the above
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Green Revolution was led by __________?
Anonymous Quiz
27%
a.Dennis Rodman
41%
b.Norman Borlaug
17%
c.Jane Goodall
16%
d.None of the above
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Hypophysation is a technique primarily used in _________?
Anonymous Quiz
36%
a.Fisheries
36%
b.Apiaries
22%
c.Poultry
5%
d.None of the above
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Set reminder ⚠️❤️ Biology complete marathon .
8 February live 12:00 PM
Like bhi krdo students😊
Set reminder ⚠️❤️ Biology complete marathon .
8 February live 12:00 PM
Like bhi krdo students
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1. What is the geometric shape of the wavefront that originates when a plane wave passes through a convex lens?
a.Converging spherical
b.Diverging spherical
c.Plane
d.None of the above
Answer: (a) Converging Spherical
2. How can the fringe width increase in Young’s double-slit experiment?
a.By decreasing the width of the slit
b.By reducing the separation of slits
c.By reducing the wavelength of the slits
d.By decreasing the distance between slits and the screen
Answer: (b) By decreasing the separation of slits
3. What is the locus of all particles in a medium vibrating in the same phase called?
a.Fringe
b.Wavelet
c.Wavefront
d.None of the above
Answer: (c) Wavefront
4. Which of the following factors does the intensity of light depend on?
a.Frequency
b.Wavelength
c.Amplitude
d.Velocity
Answer: (c) Amplitude
5. Which of the following light phenomena confirms the transverse nature of light?
a.Refraction of light
b.Diffraction of light
c.Dispersion of light
d.Polarization of light
Answer: (d) Polarization of light
6. Polaroid glasses are used in sunglasses because?
a.They are cheaper
b.They have a good colour
c.They look fashionable
d.They reduce the light intensity to half on account of polarization
Answer: (d) They reduce the light intensity to half on account of polarization
7. Two light sources are said to be coherent when both the sources of light emit light of?
a.The same amplitude and phase
b.The same intensity and wavelength
c.The same speed
d.The same wavelength and constant phase difference
Answer: (d) the same wavelength and constant phase difference
8. Which of the following is an application of the Doppler Effect?
a.Doppler Radius
b.Doppler Spectrometer
c.Doppler Velocimeter
d.All of the above
Answer: (d) All of the above
9. Who discovered Poisson’s bright spot?
a.Fresnel
b.Rayleigh
c.Fraunhofer
d.Poisson
Answer: (d) Poisson
10. Which of the following is conserved when light waves interfere?
a.Intensity
b.Amplitude
c.Phase
d.None of the above
Answer: (d) None of the above
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PDF Link :- https://dl.adda247.com/P5yT
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1. What is the geometric shape of the wavefront that originates when a plane wave passes through a convex lens?
a.Converging spherical
b.Diverging spherical
c.Plane
d.None of the above
2. How can the fringe width increase in Young’s double-slit experiment?
a.By decreasing the width of the slit
b.By reducing the separation of slits
c.By reducing the wavelength of the slits
d.By decreasing the distance between slits and the screen
3. What is the locus of all particles in a medium vibrating in the same phase called?
a.Fringe
b.Wavelet
c.Wavefront
d.None of the above
4. Which of the following factors does the intensity of light depend on?
a.Frequency
b.Wavelength
c.Amplitude
d.Velocity
5. Which of the following light phenomena confirms the transverse nature of light?
a.Refraction of light
b.Diffraction of light
c.Dispersion of light
d.Polarization of light
6. Polaroid glasses are used in sunglasses because?
a.They are cheaper
b.They have a good colour
c.They look fashionable
d.They reduce the light intensity to half on account of polarization
7. Two light sources are said to be coherent when both the sources of light emit light of?
a.The same amplitude and phase
b.The same intensity and wavelength
c.The same speed
d.The same wavelength and constant phase difference
8. Which of the following is an application of the Doppler Effect?
a.Doppler Radius
b.Doppler Spectrometer
c.Doppler Velocimeter
d.All of the above
9. Who discovered Poisson’s bright spot?
a.Fresnel
b.Rayleigh
c.Fraunhofer
d.Poisson
10. Which of the following is conserved when light waves interfere?
a.Intensity
b.Amplitude
c.Phase
d.None of the above
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PDF Link :- https://dl.adda247.com/P5yT
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WAVE OPTICS in 1 Shot: All Concept & PYQs Covered | Class 12th Boards | By Arshpreet Ma'am
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Good morning Students
Aaj ready ho na aap biology ko finish karne ke liye
Complete Biology in one video
Today 12:00 pm
Session link:- https://www.youtube.com/live/PFh2Yj65bbA?si=2uI0k3hYa3V3s3bU
Aaj ready ho na aap biology ko finish karne ke liye
Complete Biology in one video
Today 12:00 pm
Session link:- https://www.youtube.com/live/PFh2Yj65bbA?si=2uI0k3hYa3V3s3bU
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♦️DNA finger printing
(1) Alec Jeffreys et al (1985) developed the procedure of genetic analysis and forensic medicine, called DNA finger printing.
(2) It is individual specific DNA identification which is made possible by the finding that no two people are likely to have the same number of copies of repetitive DNA sequences of the regions.
(3) It is also known as DNA profiling.
(4) The chromosomes of every human cell contain scattered through their DNA short, highly repeated 15 nucleotide segments called “mini-satellites” or variable-number Tandem Repeat (VNTR).
Technique for DNA fingerprinting
(1) Only a small amount of tissues like blood or semen or skin cells or the hair root follicle is needed for DNA fingerprinting.
(2) Typically DNA content of about 100,000 cells or about 1 microgram is sufficient.
(3) The procedure of DNA fingerprinting involves the following major steps:
(i) DNA is isolated from the cells in a high-speed refrigerated centrifuge.
(ii) If the sample of DNA is very small, DNA can be amplified by Polymerase Chain Reaction (PCR).
(iii) DNA is then cut up into fragments of different length using restriction enzymes.
(iv) The fragments are separated according to size using gel electrophoresis through an agarose gel. The smaller fragments move faster down the gel than the larger ones.
(v) Double stranded DNA is then split into single stranded DNA using alkaline chemicals.
(vi) These separated DNA sequences are transferred to a nylon or nitrocellulose sheet placed over the gel. This is called ‘Southern Blotting’ (after Edward Southern, who first developed this method in 1975).
(vii) The nylon sheet is then immersed in a bath and probes or makers that are radioactive synthetic DNA segments of known sequences are added. The probes target a specific nucleotide sequence which is complementary to VNTR sequences and hybridizes them.
(viii) Finally, X-ray film is exposed to the nylon sheet containing radioactive probes. Dark bands develop at the probe sites which resemble the bar codes used by grocery store scanners to identify items.
Applications of DNA fingerprinting
This technique is now used to:
(i) Identify criminals in forensic laboratories.
(ii) Settle paternity disputes.
(iii) Verify whether a hopeful immigrant is, as he or she claims, really a close relative of already an established resident.
(iv) Identify racial groups to rewrite biological evolution.
(1) Alec Jeffreys et al (1985) developed the procedure of genetic analysis and forensic medicine, called DNA finger printing.
(2) It is individual specific DNA identification which is made possible by the finding that no two people are likely to have the same number of copies of repetitive DNA sequences of the regions.
(3) It is also known as DNA profiling.
(4) The chromosomes of every human cell contain scattered through their DNA short, highly repeated 15 nucleotide segments called “mini-satellites” or variable-number Tandem Repeat (VNTR).
Technique for DNA fingerprinting
(1) Only a small amount of tissues like blood or semen or skin cells or the hair root follicle is needed for DNA fingerprinting.
(2) Typically DNA content of about 100,000 cells or about 1 microgram is sufficient.
(3) The procedure of DNA fingerprinting involves the following major steps:
(i) DNA is isolated from the cells in a high-speed refrigerated centrifuge.
(ii) If the sample of DNA is very small, DNA can be amplified by Polymerase Chain Reaction (PCR).
(iii) DNA is then cut up into fragments of different length using restriction enzymes.
(iv) The fragments are separated according to size using gel electrophoresis through an agarose gel. The smaller fragments move faster down the gel than the larger ones.
(v) Double stranded DNA is then split into single stranded DNA using alkaline chemicals.
(vi) These separated DNA sequences are transferred to a nylon or nitrocellulose sheet placed over the gel. This is called ‘Southern Blotting’ (after Edward Southern, who first developed this method in 1975).
(vii) The nylon sheet is then immersed in a bath and probes or makers that are radioactive synthetic DNA segments of known sequences are added. The probes target a specific nucleotide sequence which is complementary to VNTR sequences and hybridizes them.
(viii) Finally, X-ray film is exposed to the nylon sheet containing radioactive probes. Dark bands develop at the probe sites which resemble the bar codes used by grocery store scanners to identify items.
Applications of DNA fingerprinting
This technique is now used to:
(i) Identify criminals in forensic laboratories.
(ii) Settle paternity disputes.
(iii) Verify whether a hopeful immigrant is, as he or she claims, really a close relative of already an established resident.
(iv) Identify racial groups to rewrite biological evolution.
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