Here is cbse 2007 question paper of science: CBSE X SCIENCE AND TECHNOLOGY (Theory) 2007 (OUTSIDE DELHI) Time allowed: 2 hours 15 mins; Maximum Marks: 100 General Instructions: | 1) | The question paper comprises of two sections A and B. You are to attempt both sections. | 2) | You are advised to attempt all the questions of Section A and Section B separately. | 3) | All questions are compulsory. | 4) | There is no overall choice. However‚ internal choice has been provided in some questions
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ovum‚ travel down fallopian tubes Fertilisation – sperm released at orgasm travel through cervix‚ uterus to ovum in fallopian tube. Sperm enters‚ nuclei fuse. ½ DNA mum/ ½ dad (Sex determined) zygote formed. Zygote to Embryo – zygote divide by mitosis‚ form human‚ placenta and amnion. First 8 weeks zygote becomes embryo (all major organs formed‚ harmful substances can harm developmental period) Embryo to foetus – next 32 weeks‚ embryo becomes foetus + continues development Birth – contractions
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Purpose Spermatogenesis produces mature male gametes‚ commonly called sperm but specifically known as spermatozoa‚ which are able to fertilize the counterpart female gamete‚ the oocyte‚ during conception to produce a single-celled individual known as a zygote. This is the
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The Sperm and the Egg PSY/265 August 26‚ 2011 The Sperm and the Egg The main function of the sperm cell is to locate an egg‚ and fertilize it forming a zygote. Sperm cells are believed to have a sense of smell in which they use to locate the egg which is one of the clue factors sperm cells use‚ sperm cells do not just swim around randomly before locating an egg to fertilize. In the females reproductive tract it becomes warmer as the Fallopian tubes are neared. That is also another clue factor
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4.3 Theoretical genetics 4.3.1 Define genotype‚ phenotype‚ dominant allele‚ recessive allele‚ co-dominant alleles‚ locus‚ homozygous‚ heterozygous‚ carrier and test cross * Genotype- the alleles of an organism * Phenotype- the characteristics of an organism * Dominant allele- an allele that has the same effect on the phenotype whether it is present in the homozygous or heterozygous state * Recessive allele- an allele that only has an effect on the phenotype when present in the
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Chapter ten focused primarily on evolution and natural selection. Evolution are the changes in traits‚ phenotypes‚ of groups of organisms over time. Darwin was influenced by Lamark and Malthus‚ who were other scientists during his time. Lamar believed that acquired characters are passed on to offspring. For example‚ giraffe necks would change for “adaptation”. Giraffes would be born with longer necks. Malthus believed that populations try to go beyond support capacity. He believed they go through
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If you are reading this you should go home and thank your mom. 40% of women choose to have an abortion ("Abortion in America."). Abortion is when a mother chooses to terminate her pregnancy. A mother can have an abortion up until right before the baby is born. There are two different kinds of abortion- in clinic abortion and the abortion pill. Three out of ten women in the United States have an abortion by the time they are 45. Some states require you to have your parents permission if you are under
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age at the same point in time. Question 9 0.5 out of 0.5 points A __________ is a prediction about behavior drawn from a __________. Selected Answer: hypothesis; theory Question 10 0.5 out of 0.5 points A zygote that separates into two clusters of cells instead of just one produces Selected Answer: identical twins. Question 11 0.5 out of 0.5 points A __________ is a segment of DNA along the length of the chromosome.
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generate any type cell 4. Stem cells are extracted from the egg destroying the embryo 4. Understand the basics of embryonic development j. Starts after fertilization and includes three stages: vii. Cleavage- the zygote divides into several smaller cells called blastomeres viii. Gastrulation-After cleavage‚ a rearrangement of cells forms a 3-layered embryo with a primitive gut.---3 germ layers(embryonic tissues) are created; endoderm‚ mesoderm‚ and ectoderm
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Prokaryotic cells vs. Eukaryotic cells Two Fundamentally Different Classes of Cells charcteristic Prokaryotic Cells Eukaryotic Cells word origins pro=before karyon=kernel or nucleus eu=true karyon=kernel or nucleus Domains of Bacteria 1. archaea or archaebacteria‚ more ancient in soil and water also in hostile environments‚ many without oxygen high salt/brine methanogens halophiles thermoacidophiles hot acidic springs 2. bacteria or eubacteria‚ more
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