Xii Biology Hots

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KENDRIYA VIDYALAYA SANGATHAN (DELHI REGION) J.N.U. CAMPUS, NEW MEHRAULI ROAD, NEW DELHI-110067 QUESTION BANK BASED ON HOTS CLASS - XII BIOLOGY 2008-2009 1 PATRON DR. SHACHI KANT AC. KVS (DR) ADVISORS MR. A.K. UPADHYAY EO KVS (DR) MR. J.P. GUPTA EO KVS (DR) COORDINATOR DR. A K SHARMA PRINCIPAL KV PITAM PURA ASSOCIATE COORDINATOR MRS. L. CHERIAN VICE PRINCIPAL KV, No.3 DELHI CANTT RESOURCE PERSONS S.No 1 2 3 4 5 6 7 8 NAME Mr. S P Singh Mrs. U. Taneja Mr. A K Upadhyay Mrs. K Vijaya Mrs. K
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  1 KENDRIYA VIDYALAYA SANGATHAN KENDRIYA VIDYALAYA SANGATHAN KENDRIYA VIDYALAYA SANGATHAN KENDRIYA VIDYALAYA SANGATHAN  (DELHI REGION) J.N.U. CAMPUS, NEW MEHRAULI ROAD, NEW DELHI-110067 QUESTION BANK BASED ON HOTSCLASS - XIIBIOLOGY 2008-2009    2 PATRON DR. SHACHI KANTAC. KVS (DR) ADVISORS MR. A.K. UPADHYAY MR. J.P. GUPTAEO KVS (DR) EO KVS (DR) COORDINATOR ASSOCIATE COORDINATOR DR. A K SHARMA MRS. L. CHERIANPRINCIPAL VICE PRINCIPALKV PITAM PURA KV, No.3 DELHI CANTT RESOURCE PERSONS S.No NAME POST VIDYALAYA (DR)1 Mr. S P Singh PGT KV Janak puri (Ist shift)2 Mrs. U. Taneja PGT KV Pitam Pura3 Mr. A K Upadhyay PGT KV No.2 Delhi Cantt4 Mrs. K Vijaya PGT KV No.2 Delhi Cantt5 Mrs. K. Maitra PGT KV AGCR Delhi6 Mrs.Hemlata PGT KV NFC Vigyan Vihar7 Mrs. Shubra Dass PGT KV Manesar8 Mrs. Neelam Diwan PGT KV Vikas Puri  3 BIOLOGY - XII01REPRODUCTION IN ORGANISMSHOTS (Questions) 1.   What is the terminology for the concept of group immortality?2.   Life span of May fly is 01 day while that of Banyan tree can be 200 yrs. What message doyou get from this data concerning BMR (Basic Metabolic Rate)?3.   In a pond you see green colour long filaments, which is a type of algae consisting of singlelayer aggregation of vertically arranged cells. What sort of strategy can this type of cellularaggregation adopt for multiplication?4.   Differentiate the following diagrams based on the process going on :- 5.   “Any organic material kept in moist and dark conditions gets infected with fungus,although there was no sign of fungus prior to it.” How fungus does make it possible,although it is a microbe?6.   Potato is a food source but small potatoes are generally called as potato seeds, so they aredirectly used for cropping purposes. How a farmer does get a new plant from such a potatoseed?7.   Central dogma of reproduction “Like produces like” i.e. kids resemble the parents.Recently it was in the news that a south Indian farmer has been able to get nearly 200 typesof mangoes from a single mango tree. How could this have been possible?8.   Like produces 100 % like itself is valid for______,_______,_______,______ types of multiplication strategies ?1a1b2a 2b  49.   It is a common observation that we see small plantlets of Dalbergia sissoo (Shisham)growing in a circle within a diameter of 05 m around the parent plant. What justificationcan you give for this observation (in reference to sexual or vegetative modes of reproduction)?10.   With the onset of rainy season one can see the green cover of grass appearing quickly, thereafter its spreading is not as fast as its appearance. Justify this observation?11.   The principle of life states that every form of life has to die; still Amoeba is called asimmortal. Give specific reason for it?12.   When multiplication of species can occur with the help of asexual methods, then why theorganisms adopt to sexual methods of multiplication?13.   ‘In single celled organisms, the offspring’s are the similar to one another and are the exactcopies of the parent’. Can these offspring’s be called as genetically identical to the parent?Would it be correct to call them clones?14.   What is the terminology used for asexual multiplications when a single celled organismdivides into two equal halves or when it divides into two unequal parts?15.   Sporulation is common in lower organisms. What type of spores will be formed if such anorganism resides in an aquatic habitat and secondly in dry habitat?16.   Both vegetative and asexual reproductions do not involve any sexual method so they comeunder a common category, yet they are different in one specific point. Elaborate thatspecific point ?17.   Why runner, sucker, tuber, offset, bulb are called as vegetative propagules ?18.   Water hyacinth is one of the most invasive aquatic weed, resulting in the degradation of aquatic ecosystem and thereby death of fishes. Does it directly damage the fish life? Giveyour answer with proper justification?19.   Water hyacinth, a most invasive aquatic weed is widely spread and expands rapidly in thegrowing season. Which multiplication strategy would you attribute to this type of observation?20.   Why the lower organisms resort to sexual mode of reproduction just before the onset of unfavorable conditions?21.   The changes in the body that are observed during the attainment of reproductive maturityare broadly categorized into two. What are the categories?22.   The population of humans on this earth would not have been this much if humans hadoestrous cycle rather than menstrual cycle. Give your justification?23.   In oogamy, female gamete is large and non-motile but the male gamete is reverse in itsproperties. Why such type of adjustment is there in higher organisms?24.   “Sexual reproduction generally involves fusion of gametes from two different parentsbelonging to a species, but this is not always true.” What explanation can you give insupport of the statement?25.   A student while crossing across a papaya orchard observed that some papaya plants haveflowers with a very small papaya like structure at its base, while there were other papayaplants that had flowers without such a swollen portion. What information do you getconcerning the type of plant and the flower from the above data?26.   Both the prefixes ( Uni- and Mono- ) have the same meaning i.e. one in number. Does itmean that uni-sexual and mono-ecious species are the same?27.   The chromosome number of a meiocyte of a house fly and that of a human is 12 and 46respectively. What is the number of chromosomes in their mitocytes?
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