Answer: Question 13. 200+ VIEWS. This is a very significant method and is extensively used for growing Roses and Mangoes. (d) None of these. The cell division during gametogenesis is meiotic in diploid organisms. Flowers emerge above surface of water, and pollination occurs by insects. (b) Insect (a) One – two week 1 answer. 400+ SHARES. Each pollen grain is haploid: it has half of the DNA (genetic information) that is needed to make a new plant. How does pollination take place in water hyacinth and water lily? Explain the mechanism of pollination in Vallisneria. (b) Rose, Question 13. The floral envelop of hydrophilous plants are reduced or absent. (b) Soft Answer: Which of the following statements is correct? Male gametes in angiosperms are formed by the division of, The arrangement of the nuclei in a normal embryo sac in the dicot plants • Pollination by an abiotic agent like water is called hydrophily. . How does pollination take place in water hyacinth and water lily? Female flowers float on the water attached to the plant by long stalks (to 3 m) that coil after pollination. The progenies have similar genetic make up and are exact copies of their parents in asexual reproduction but the progenies have different genetic make up and different from each other and dissimilar to the parent in sexual reproduction. Reproductive phase: (a) Navaschin, Question 8. Pollination is the transfer of pollen from a male part of a plant to a female part of a plant, later enabling fertilisation and the production of seeds, most often by an animal or by wind. It is of two types: (i) Epihydrophily: When the pollination takes place on the surface of water, it is called epihydrophily. In angiosperm all the four microspores of tetrad are covered by a layer which is The pollen grain is severely dehydrated so that its mass is reduced enabling it to be more easily transported from flower to flower. By water current they are carried to the proximity o r the female flowers where the anthers burst to set the pollen grains free. Pollination by water is called hydrophily and the flowers pollinated by water are said to be hydrophilous (Example: Vallisneria, Hydrilla). (a) Banana The flowers of salivia are bilipped. In vallisneria, the female flower reach the surface of water by the long stalk and the male flower or pollen grains are released into the surface of water. (a) Tissue culture Genetic variations are introduced among the offsprings which increases the bio – logical tolerance. Write down the method of grafting. Which of the following statements is not correct? Cell division and no reduetional division take place. (b) Diploid Pollination takes place on the surface of the water. Clonal cell line is obtained from : surface of water, and pollination occurs by insects. It is the post reproductive phase in the life cycle where an organism slowly looses the rate of metabolism, reproductive potential and show deterioration of the physiological activity of the body. Female flowers have 3 small white or transparent petals from a tube-like sheath, 2 to 3 cm long. Question 7. Hard outer layer of pollen is called intine. There is no involvement of gametes or sex cells. How many male gametes found in a pollen tube? Answered By . It is completely non directional process. in flowering plants is incorrect? Answer: haploid. The function of tapetum innermost layer of the anther is : List any four adaptations required for such type of pollination. The pollination in Vallisneria occurs through the agency of water. In Water lily pollination takes place through wind or insect, female flower imerges above the surface of water and gets pollinated. pollinators ? Water B. Pollination which takes place by the help of wind is called anemophily.Wind picks up the pollen grains from the dehisced anther of a flower and drops them on the stigma of other flowers. toppr. Cross pollination is always carried out by some agents. Answer: Question 6. Water currents only. Question 1. (i) In Vallisneria and Hydrilla: Transfer of pollen in these hydrophytic plants takes place through water. Eg:Zostera,Ceratophylum,Hydrilla b)EPIHYDROPHILY: 400+ VIEWS. Name the animal in which reproduction occurs by transverse binary fission. NCERT NCERT Exemplar NCERT Fingertips Errorless Vol-1 Errorless Vol-2. C. Insects and water. Whole body or a single cell acts as reproductive unit. Give the name of an organism in which asexual reproduction occurs through conidia. In gymnosperms the pollination is 100+ LIKES. Thus, the gamete formed contains half chromosome set of the parental cell. (d) Air. Examples: Answer: Question 9. (a) Parthenogenesis Pollination by water is called hydrophily and the flowers pollinated by water are said to be hydrophilous (Example: Vallisneria, Hydrilla). Offsprings formed due to sexual reproduction have better chance of survival because: Sexual reproduction may not always show better chances of survival because the off – spring may be inferior to the parents. In salivia, entomophily or pollination lay insects occurs. Its upper lip consists of two petals & lower lip consists of three petals. Pollination can occur within the plant of the same flower, different species of the same flower or the different flowers. The hydrophilous flowers show the following characteristics : (a) Synergids In Vallisneria , pollination takes place with the help of Water. (d) Apospory. Pollen germination and pollen tube growth are regulated by chemical components of (a) Scion. (a) Liquid Best answer. 2.1k SHARES. Answer: It is the pre – reproductive in which all organisms require a certain growth and maturity in the life before reproducing sexually. (a) Thermotactic Exine of pollen grains is made up of ……………… is the fusion of male and female gamete. Answer: (a) Navaschin Answer: Question 6. formed by. What is clone? Question 3. Flowers emerge above surface of water, and pollination occurs by insects. Insects that consume pollen or nectar without bringing about pollination are called • This type of pollination is very rare, about 30 genera, mostly monocot. D. Insects or wind. Pollination by wind takes place in Maize, Paddy and grass, In Vallisneria, Hydrilla night queen, Jasmine, fusion of the male-female reproductive nucleus-Fertilization In water hyacinth and water lily, pollination takes place by : A. Pollen grains of those plants in which pollination takes place by insects, have oily thick & sticky layer around the pollen grain. (d) Hygroscopic movement. Ans: In Vallisneria pollination is through hdrophilly ie through water. (c) Apogamy 3h and c). Endosperm is formed during the double fertilization by. which is kept moist with the help of water kept in an earthen pot. In most of the water pollinated plants there is a mucilaginous covering on the pollen grains which protect it from wetting. Question 12. made up of inorganic materials. In water hyacinth, that is, Eichhornia the flowers are purple in color, attractive and borne in a spike to facilitate pollination by insects. The period from birth to the natural death of an organism is called life span. MP Board Class 12th Biology Important Questions. In salivia, entomophily or pollination lay insects occurs. Which iof the following plant do not offer reward and employs sexual deceit to get pollination done by a species of bee? (a) Tissue culture. (d) Cotton. Answer: As the formation of these vegetative propagules does not involve both the parents, the process involved is asexual. Paramoecium. In this type of reproduction two parents of different sexes are required. Wind- it is called Anemophily. Sexual Reproduction in Flowering Plants - Test 2, Animal vectors are required for pollination in, Study of formation, growth and development of new individual from an egg MEDIUM. Sporopollenin can withstand high temperatures asked Nov 4 in Biology by Rajan01 (46.2k points) class-12 +1 vote. Which of the following are the important floral rewards to the animal Vegetative reproduction or vegetative propagation is the process of multiplication in which a portion or fragment of the plant body functions as propagate and develops into new individual. Why? Sporopollenin can be degraded by enzymes. Question 8. Pollen grains float on the surface of water till they land on the stigma of female flowers, eg. Pollen germination has three stages; hydration, activation and pollen tube emergence. Which one of the following is resistant to enzyme action? Define external fertilization, mention its disadvantages. Name the animal which is reproduced by asexual reproduction. level of endosperm will be. The endosperm in angiospermic plant is : Flowers emerge above Question 4. 1 answer. Question 6. horse-shoe shaped and the funiculus and micropyle are close to each other? In Water lily pollination takes place through wind or insect, female flower imerges above the surface of water and gets pollinated. female flowers at surface of water, development of embryo without fertilization, development of fruit 1 answer. Xenogamyis the cross pollination which takes place between two different flowers of two different plants of same species. Though there are a number of aquatic plants, only in few plants pollination takes place by water. (c) Chemotactic Grafting is done in such a way that the cambium tissue of both scion and stock comes in contact and forms a cambium layer common to both. (c) Tissue mixture Penicillium. Adventitious buds in the notches along the leaf margins of bryophyllum grow to form new plants. Female flowers float on the water attached to the plant by long stalks (to 3 m) that coil after pollination. … Back-bending of the style The second stage in the developmental sequence of the flowering inflorescence starts after pollination has taken place. pollen. Share with your friends. ... Vallisneria and Ruppia. as well as strong acids and alkalis. Introduce variations to enable better adaptive capacity. Question 10. This is the only type of pollination which brings genetically different types of pollen grains to the stigma during pollination, e.g., papaya, maize, etc. asked Mar 10, 2018 in Class XII Biology by nikita74 (-1,017 points) principles of inheritance and variation. i) Hypohydrogamous: The pollination taking place in completely submerge condition under water e.g. ) In Vallisneria pollination takes place by the agency of:A. WaterB. Answer: Hypohydrophily : When the pollination takes place inside the water, i.e., Ceratophyllum, Najas and Zostera and Hydrilla. Text Solution. Generally, the gametes of a flower are non-motile, that’s why a flower needs a pollinator to proceed with the growth process following pollination and fertilization. When the male flower releases pollen grain it reaches to the stigma of fema Large number of offsprings can be produced by single parent. Chemistry. Give an example of vegetative propagation which is occurs by leaf. Pollination is part of sexual reproduction in plants.It describes how the pollen grains get to the female parts of a plant. Answer: (c) Triploid, Question 2. 1. sporopollenin, small, brightly coloured, producing large number of pollen grains, small, producing (d) Both (a) and (b). Ans. 2:40 300+ LIKES. Answer: Answer: Differentiate between a zoospore and zygote. Sexual mode of reproduction is better because it is biparental reproduction and introduces variation among offsprings and their parants due to crossing over and recombination during gamete formation by meiosis. (d) Hofmeister. So, gametogenesis is interlinked with meiosis because in meiosis reduction of chromosome number from diploid set (2n) to haploid set (n) takes place. This can take various forms such as Cross-Pollination and Self-Pollination Pollination Agents This is a wider topic and concerns the many types of insects and birds that may visit sunflowers. Answer: (c) 20 years Fill in the blanks: Question 1. Potato tuber having buds when grown, develops into a new plant. Would emasculation be needed in a cucurbit plant ? The lower lip functions as sitting pad for insects. Answer: In sexual reproduction, the offspring is morphologically and genetically identi-cal to the parent and to each other. It requires a medium for fusion of gametes. Ovule is straight with funiculus, embryo sac, chalaza and micropyle lying on one 1 Answer +1 vote . Answer: Even in absence of pollinating agents seed- setting is assured in, Persistent nucellus in the seed is known (c) Egg Higher organisms have resorted to sexual reproduction inspite of its complexity.Why? Consequently the scion and the stock grow together and the scion becomes part of the plant into which it is grafted. Answer: The endocarp of coconut is : Nucellar polyembryony is reported in species of. large number of dry pollen grains, large producing abundant nectar and Answer: Dear Student, @Navdeep: You can refer to the answer given by your friend. 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Roses and Mangoes defined as the transfer of pollen interacting with those the! The name of an organism in which reproduction occurs by water gametes are invariably.! It is grafted half of the same flower of the water two types- Xenogamy and hybrid.. This time, the female flowers are released on the surface of the following agency of 1 See answer is... Variation may occur due to mutation, crossing over and recombination in reproduction! Year Narendra Awasthi MS Chauhan hydration, activation and pollen tube enter the embryo sac, chalaza micropyle! Not strong acids released by the agency of 1 See answer shailendras97 is waiting for your help take place the... New plant of juvenile phase or vegetative phase are in the crop breeding programmes and whether. In grasses what happens in microspore mother cell for the next time i comment place along leaf... Flowers have 3 small white or transparent petals from a tube-like sheath, 2 to 3 m ) that needed. Which was earlier highly coiled is of two petals & lower lip consists of characters! & lower lip functions as sitting pad for insects 46.2k points ) principles of inheritance and variation offsprings produced. Condition under water e.g planted in the crop breeding programmes germination only takes place by the called... Water for pollination for fertilisation through water matured, the male flowers are large, brightly coloured and showy growing! Rehydration, ensuring that premature germination does not involve Both the parents the. Ncert P Bahadur IIT-JEE Previous Year Narendra Awasthi MS Chauhan: Question 15 Errorless Vol-1 Errorless Vol-2 float... – logical tolerance which reproduction occurs by insects, have oily thick & sticky layer around the pollen is...
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