In the list of organisms given below, those that reproduce by the asexual method are
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1 In the list f rganisms given belw, thse that reprduce by the asexual methd are Banana Dg Yeast Ameba (ii) and (iv) (i), (iii) and (iv) (i) and (iv) (ii), (iii) and (iv) Answer:(b) (i), (iii) and (iv) In a flwer, the parts that prduce male and female gametes (germ cells) are Stamen and anther Filament and stigma Anther and vary Stamen and style Answer: (c) Anther and Ovary Which f the fllwing is the crrect sequence f events f sexual reprductin in a flwer? Pllinatin, fertilisatin, seedling, embry Seedling, embry, fertilisatin, pllinatin Pllinatin, fertilisatin, embry, seedling Embry, seedling, pllinatin, fertilizatin Answer: (c) Pllinatin, fertilizatin, embry, seedling Offspring frmed by asexual methd f reprductin have greater similarity amng themselves because Asexual reprductin invlves nly ne parent
2 Asexual reprductin des nt invlve gametes Asexual reprductin ccurs befre sexual reprductin Asexual reprductin ccurs after sexual reprductin (i) and (ii) (i) and (iii) (ii) and (iv) (iii) and (iv) Answer: (a) (i) and (ii) Characters transmitted frm parents t ffspring are present in Cytplasm Ribsme Glgi bdies Genes Answer: (d) Genes Characters that are transmitted frm parents t ffspring during reprductin shw Only similarities with parents Only variatins with parents Bth similarities and variatins with parents Neither similarities nr variatins Answer: (c) Bth similarities and variatins with parents A feature f reprductin that is cmmn t Ameba, Spirgyra and Yeast is that They reprduce asexually They are all unicellular They reprduce nly sexually
3 They are all multicellular Answer: (a) They reprduce asexually In Spirgyra, asexual reprductin takes place by Breaking up f filaments int smaller bits Divisin f a cell int tw cells Divisin f a cell int many cells Frmatin f yung cells frm lder cells Answer: (a) Breaking up f filaments int smaller bits The ability f a cell t divide int several cells during reprductin in Plasmdium is called Budding Reductin divisin Binary fissin Multiple fissin Answer: (d) Multiple Fissin The crrect sequence f reprductive stages seen in flwering plants is Gametes, zygte, embry, seedling Zygte, gametes, embry, seedling Seedling, embry, zygte, gametes Gametes, embry, zygte, seedling Answer: (a) Gametes, zygte, embry, seedling The number f chrmsmes in parents and ffsprings f a particular species remains cnstant due t
4 Dubling f chrmsmes after zygte frmatin Halving f chrmsmes during gamete frmatin Dubling f chrmsmes after gamete frmatin Halving f chrmsmes after gamete frmatin Answer: (b) Halving f chrmsmes during gamete frmatin In Rhizpus, tubular thread-like structures bearing sprangia at their tips are called Filaments Hyphae Rhizids Rts Answer: (b) Hyphae Vegetative prpagatin refers t frmatin f new plants frm Stem, rts and flwers Stem, rts and leaves Stem, flwers and fruits Stem, leaves and flwers Answer: (b) Stem, rts and leaves Factrs respnsible fr the rapid spread f bread muld n slices f bread are Large number f spres Availability f misture and nutrients in bread Presence f tubular branched hyphae Frmatin f rund shaped sprangia (i) and (iii) (ii) and (iv) (i) and (ii)
5 (iii) and (iv) Answer: (c) (i) and (ii) Length f pllen tube depends n the distance between Pllen grain and upper surface f stigma Pllen grain n upper surface f stigma and vule Pllen grain in anther and upper surface f stigma Upper surface f stigma and lwer part f style Answer: (c) Pllen grain in anther and upper surface f stigma Which f the fllwing statements are true fr flwers? Flwers are always bisexual They are the sexual reprductive rgans They are prduced in all grups f plants After fertilisatin they give rise t fruits (i) and (iv) (ii) and (iii) (i) and (iii) (ii) and (iv) Answer: (b) (ii) and (iv) Which amng the fllwing statements are true fr unisexual flwers? They pssess bth stamen and pistil They pssess either stamen r pistil They exhibit crss pllinatin Unisexual flwers pssessing nly stamens cannt prduce fruits (i) and (iv) (ii), (iii) and (iv) (iii) and (iv)
6 (i), (iii) and (iv) Answer: (b) (ii), (iii) and (iv) Which amng the fllwing statements are true fr sexual reprductin in flwering plants? It requires tw types f gametes Fertilisatin is a cmpulsry event It always results in frmatin f zygte Offspring frmed are clnes (i) and (iv) (i), (ii) and (iv) (i), (ii) and (iii) (ii), (iii) and (iv) Answer:(c) (i), (ii) and (iii) >In the given figure, the parts A, B and C are sequentially Ctyledn, plumule and radicle Plumule, radicle and ctyledn Plumule, ctyledn and radicle Radicle, ctyledn and plumule Answer: (d) Radicle, ctyledn and plumule Offspring frmed as a result f sexual reprductin exhibit mre variatins because Sexual reprductin is a lengthy prcess Genetic material cmes frm tw parents f the same species Genetic material cmes frm tw parents f different species
7 Genetic material cmes frm many parents Answer: (b) Genetic material cmes frm tw parents f the same species Reprductin is essential fr living rganisms in rder t Keep the individual rganism alive Fulfill their energy requirement Maintain grwth Cntinue the species generatin after generatin Answer: (d) Cntinue the species generatin after generatin During adlescence, several changes ccur in the human bdy. Mark ne change assciated with sexual maturatin in bys Lss f milk teeth Increase in height Cracking f vice Weight gain Answer: (c) Cracking f vice In human females, an event that reflects nset f reprductive phase is Grwth f bdy Changes in hair pattern Change in vice Menstruatin Answer: (d) Menstruatin In human males, the testes lie in the scrtum, because it helps in the Prcess f mating
8 Frmatin f sperm Easy transfer f gametes All the abve Answer: (b) Frmatin f sperm Which amng the fllwing is nt the functin f testes at puberty? Frmatin f germ cells Secretin f teststerne Develpment f placenta Secretin f estrgen (i) and (ii) (ii) and (iii) (iii) and (iv) (i) and (iv) Answer: (c) (iii) and (iv) The crrect sequence f rgans in the male reprductive system fr transprt f sperms is Testis vas deferens urethra Testis ureter urethra Testis urethra ureter Testis vas deferens ureter Answer: a Testis vas deferens urethra Which amng the fllwing diseases is nt sexually transmitted? Syphillis Hepatitis HIV AIDS Gnrrhea Answer: (b) Hepatitis
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