Index
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IMPORTANT QUESTIONS

  1. Q281 Suppose in a combination the equivalent resistance is smaller than the smallest resistance used in the circuit. Which type of combination is present in the circuit?
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  2. Q282 The chromosomal producing parents and their offspring is same. Justify this statement.
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  3. Q283 How many types of genes are there? Name them.
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  4. Q284 An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be
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  5. Q285 Modern genetics is based on the gene and fundamental unit is heredity. Mendel was the first to recognise the existence of gene. He concluded that the heredity determinants of a particular nature is known as genes. In dihybrid crosses Mendel found 9:3:3:1 ratio in the F2 generation, which in reality is 3:1 ratio combined at random. In a species of plant, the allele for tall stems is dominant over that for short stems and the allele for purple flowers is dominant over that for white flowers. A cross between two plants produced the following phenotypic ratio: tall, purple-flowered 3 tall, white-flowered 3 short, purple-flowered 1 short, white-flowered 1 What are the phenotypes o
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  6. Q286 Read the following statements and justify same in your own words with the help of suitable examples. Geographical and reproductive isolation of organisms gradually leads to speciation.
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  7. Q287 Fertilization in flowering plants is called double fertilization.
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  8. Q288 Select the appropriate options and complete the following paragraph. Cell division by meiosis is completed through______(i)________stages. Recombination occurs between_______(ii)_______chromosomes. _____(iii)_________.resembles the process of mitosis. During meiosis-1, two____(iv)__________are formed, whereas daughter cells during meiosis-II, ____(v)__________haploid cells are formed. All daughter cells formed through meiosis are genetically______(vi)________with respect to parent cells due to genetic recombination.
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  9. Q289 Rewrite the following statements using correct options and explain the completed statements. (gluconic acid, coagulation, amino acid, acetic acid, Clostridium, Lactobacilli) Harmful bacteria like__________are destroyed due to probiotics.
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  10. Q290 Where in periodic table do we find: elements forming negative ions.
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