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NCERT Books for Class 9 Science - Start your studies. You can also get many other study materials for Class 9 Science, like sample papers, notes, etc., to prepare for the 2023-24 annual exams.
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NCERT Social Science chapter-wise PDF of History, Political Science, Geography and Economics are provided here. Refer to these textbooks while preparing for 2023-24 annual exam.
#ncert social science class 9 textbook#sst class 9 ncert book#ncert social science book class 9#class 9 ncert social science book#ncert class 9 sst book#ncert sst book class 9
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CBSE Class 9 Maths book PDFs available here for free. Study from these Maths books and make a strong grasp on the concepts and score well in the 2023-24 annual exams.
#ncert maths book class 9#class 9 ncert maths book#class 9 maths ncert pdf#ncert class 9 maths book#ncert math book class 9#class 9 maths ncert book
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Get access to NCERT books for Class 9 2023-24 in PDF format with our comprehensive subject-wise & Chapter-wise list. Download them for free & start learning now!
#ncert books pdf class 9#ncert books class 9th#class 9th ncert textbook#class 9th ncert book pdf#ncert book class 9 pdf#ncert class 9 book pdf
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"Answer: (d) Between the pole and the principal focus of the mirror"
#The image formed by a concave mirror of an object is found to be virtual#erect and larger than the object. The position A. Between the principal focus and the center of curvature B. At center of curvature C. Beyo
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"Answer: (d) Soil"
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"Answer: –0.5 D"
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"Answer: m = –1, v = +50, u = ? m = v/u -1 = 50/u u = 50/(-1) u = -50
Using lens formula, 1/f = 1/v - 1/u = 1/50 - 1/(-50) = 2/50 f = 25cm
Power of lens, P = 1/f = 100/25 m-1 = +4 D"
#A convex lens forms a real and inverted image of a needle at a distance of 50cm from it. Where is the needle placed in front of the convex l#find the power of the lens.
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"Answer: f= R / 2
= 20/2
= 10 cm"
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"Answer: The principal focus of a concave mirror is the point on its principal axis where rays parallel to the principal axis meet after reflection from the mirror."
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"Answer: If tall pea plants with round seeds are crossed with dwarf plants with wrinkled seeds, then in the F2 generation, the tall or dwarf trait and the rounded wrinkled trait are inherited independently.
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"Answer: First a pure black skin dog (BB) and a pure white skinned bitch (WW) are selected. They are hybridized on time. If all the pups produced in them are black-skinned then the black-skinned trait is said to be dominant.
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"Unicellular Organisms
""1. Reproductive Cell. The same cell which functions as the body of the organism also gets transformed into reproductive cells."" ""2. Asexual Reproduction occurs through fission, budding, and spore formation.""
No special sex cell or sex organ is present.
Multicellular Organisms
Specific cells take part in reproduction. 2.It occurs by several methods like fragmentation regeneration, budding, spore formation, vegetative reproduction, etc.
A special sex cell or sex organ is present."
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"Answer: The following are the different methods of contraception :
Physical devices such as condoms, diaphragms, and cervical caps are used. This method involves tablets or drugs which have to be taken orally. These contain small doses of hormones that prevent the discharge of eggs and thus fertilization cannot occur. Contraceptive devices such as loop or Copper-T are placed within the uterus to prevent pregnancy. In the surgical method, the fallopian tubes are blocked in females to stop the flow of eggs, and vas deferens are blocked in men to stop the flow of sperm. Self-control is also a solution."
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Answer : Click on above link....
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"Answer: If there is no fertilization of the ovum, it lives for about a day because each ovary releases a new egg. Therefore, the uterus also prepares every month to receive the fertilized egg. Its end wall becomes fleshy and conjoined. It is necessary for the nutrition of the egg at the time of fertilization. But in the absence of fertilization, even this layer is not needed. Therefore, this layer gradually breaks down and is expelled from the vaginal tract in the form of blood and mucus. This cycle takes about 1 month and it is called the menstrual cycle. Its duration is about 2 to 8 days."
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"Answer: Pollination is the process of transfer of pollens from anther to stigma. It occurs with the help of certain pollinators such as air, water, birds, or some insects. Fertilization,on the other hand, is the fusion of the male and female gametes. It occurs inside the ovule and leads to the formation of zygote."
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