This phenomenon is called. Hypohydrophily : When the pollination takes place inside the water, i.e., Ceratophyllum, Najas and Zostera and Hydrilla. horse-shoe shaped and the funiculus and micropyle are close to each other? Hybridismis the cross pollination which takes place between two genetic ally different plants. Sweat glands B. Gastric glands C. Tear glands D. Sebaceous glands (f) (a) Parthenogenesis Chemistry. MP Board Class 12th Biology Important Questions. Wind and water. Maths. Answer: 2.1k SHARES. What we called the population of genetically similar organisms formed by asexual reproduction? 3. Thus pollination takes place, after which the … Answer: (a) Parthenogenesis. (a) Navaschin BirdsD. Add your answer and earn points. (b) Stock 3. (iii) In Vallisneria pollination takes place by the agency of: A. It is the end of juvenile phase or vegetative phase. In salivia, entomophily or pollination lay insects occurs. Pollination occurs when the transfer of pollen grains from the anthers to the stigma of a flower of the same species take place. Answer: Answer: In water hyacinth and water lily, pollination takes place by : asked Sep 14 in Biology by Manoj01 (50.1k points) neet 2020; 0 votes. 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. are capable, of producing new offsprings by the process called vegetative propagation. Why is vegetative reproduction also considered as a type of asexual reproduction? (b) Mechanical The endocarp of coconut is : It is the formation of embryo from zyg – ote cell. Clonal cell line is obtained from : Pollination by water is called hydrophily and the flowers pollinated by water are said to be hydrophilous (Example: Vallisneria, Hydrilla). 1. Living vegetatively as a submersed aquatic, its dioecious flowers are brought together at the surface of the water in most ingenious fashion. (a) Liquid Differences between Asexual and Sexual reproduction: Vegetative reproduction is considered as a type of asexual reproduction because: Question 8. Question: Name two plants where vegetative reproduction takes place by roots. (d) Very hard and stony. Explain. Pollinating agents are animals such as insects, birds, and bats; water; wind; and even plants themselves, when self-pollination occurs within a closed flower. Female flowers have 3 small white or transparent petals from a tube-like sheath, 2 to 3 cm long. Pollination takes place on the surface of the water. ... Name two plants in which pollination occurs by water. Split part of the body which is reproduce and developed in new plant is called. Its upper lip consists of two petals & lower lip consists of three petals. The water pollinated plants are of two types : i) Hypohydrogamous: The pollination taking place in completely submerge … Six agents of pollination are. It is carried out via specific vectors refers to as “Pollinators”. Answer: This takes place in aquatic plants. Pollination by wind takes place in Maize, Paddy and grass, In Vallisneria, Hydrilla night queen, Jasmine, fusion of the male-female reproductive nucleus-Fertilization Female flowers float on the water attached to the plant by long stalks (to 3 m) that coil after pollination. Pollen grain reach to the female flowers passively by water currents. It is a modified form of layering in which the cut or injured branch is not buried in the soil but is bound with mud and rags, etc. (d) Hofmeister. [hots; Delhi 2010] Ans.In Vallisneria,the male flowers are released on the water surface. … Flowers emerge above surface of water, and pollination occurs by insects. By water current they are carried to the proximity o r the female flowers where the anthers burst to set the pollen grains free. Reproductive phase: It requires a medium for fusion of gametes. the four structures A, B, C and D are identified correctly. (d) Hygroscopic movement. (d) Apospory. Answer: Question 13. 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. Which iof the following plant do not offer reward and employs sexual deceit to get pollination done by a species of bee? Answer: Answer: Give two examples of hermaphrodite plants. @Kriti: Good answer!! Potato tuber having buds when grown, develops into a new plant. Ans: In Vallisneria pollination is through hdrophilly ie through water. 0 votes. 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. 1 answer. (c) Animal Write the mode of pollination in Vallisneria and water lily. Eg:Lemma,Zostera,Vallisneria TYPES OF HYDROPHILY: a)HYPOHYDROPHILY: It occurs below the surface of water. The flowers of salivia are bilipped. In many aquatic plants with emergent flowers, pollination occurs by wind or insects, e.g., Lotus, Water Lily, Water Hyacinth. Explain the process of pollination in Vallisneria .How is it different in water- lily , which is also an aquatic plant ? 200+ VIEWS. What is ageing? Question 5. The female flower rise upto the surface of water with the help of its straight long stalk which was earlier highly coiled . a) anemophily b) hydrophily c) entamophily d) ornithophily Answer: (a) anemophily. 2. Answer: Xenogamyis the cross pollination which takes place between two different flowers of two different plants of same species. In Water lily pollination takes place through wind or insect, female flower imerges above the surface of water and gets pollinated. Insects that consume pollen or nectar without bringing about pollination are called Reproduction in Organisms  Short Answer Type Questions. in vallisneria pollination takes place by the agency of? Question 7. liquid nitrogen can be used in the crop breeding programmes. Answer: (d) … Two types of reproduction occur in the living organisms: Question 2. 16. In Water lily pollination takes place through wind or insect, female flower imerges above the surface of water and gets pollinated. (a) Water is. 2. • All aquatic plants are not Hydrophily. The floral envelop of hydrophilous plants are reduced or absent. Offsprings remain pure, i.e., alike their parents. A scion is grafted over stock. Sporopollenin can withstand high temperatures Write the name of an algae in which reproductive metshod occurs by zoospores. Question 1. Question 7. ANSWER. In Vallisneria , pollination takes place with the help of Water. Question 4. Question 6. Why? When the cross-pollination in a flower takes place with the help of water, it is called hydrophilous and the phenomenon is termed as hydrophily. Wind- it is called Anemophily. (b) Soft, Question 5. Ans. a) grass b) Vallisneria c) hydrilla d) lotus Answer: a) grass. Which of the following pair have haploid structures? Save my name, email, and website in this browser for the next time I comment. Now, the branch is cut and separated from the parent plant and planted in the soil. In Ginger and Turmeric. haploid. large number of dry pollen grains, large producing abundant nectar and Answer: In sexual reproduction, the offspring is morphologically and genetically identi-cal to the parent and to each other. It is the pre – reproductive in which all organisms require a certain growth and maturity in the life before reproducing sexually. Each pollen grain is haploid: it has half of the DNA (genetic information) that is needed to make a new plant. How dose pollination takes place in salivia. How many male gametes found in a pollen tube? Disadvantages of external fertilization: Question 14. Which of the following statements is not correct? Endosperm is formed during the double fertilization by. Stored pollen in sporopollenin, small, brightly coloured, producing large number of pollen grains, small, producing Adventitious buds in the notches along the leaf margins of bryophyllum grow to form new plants. Epihydrophily takes place over the surface of water, e.g., Vallisneria. CHARACTERISTICS: a)Anemophilous plants grow in large group.This ensures the pollination of flowers of all the plants. Question 10. Pollination by wind takes place in Maize, Paddy and grass, In Vallisneria, Hydrilla night queen, Jasmine, fusion of the male-female reproductive nucleus-Fertilization b)In many herbaceous plants the flowers are produced above the fooliage.This … 1 Answer +1 vote . 3:01 1.1k LIKES. In which plant vegetative propagation occurs through rhizome? Question 9. Eg:Zostera,Ceratophylum,Hydrilla b)EPIHYDROPHILY: Differences between Zoospores and Zygote: Question 15. level of endosperm will be. NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. The young ones are often exposed to the predators. The function of tapetum innermost layer of the anther is : (a) Tissue culture Answer: Which of the following statements is correct? Pollination is defined as the transfer of pollen grains from the anther to the stigma. 5. • This type of pollination is very rare, about 30 genera, mostly monocot. The period from birth to the natural death of an organism is called life span. Name the animal which is reproduced by asexual reproduction. Pollination by wind is also known as _____. (d) Both (a) and (b). The pollen grain is severely dehydrated so that its mass is reduced enabling it to be more easily transported from flower to flower. Hence, it is called clone. Answer: (d) 140 years. After fertilization, offsprings are produced large in number but no parental care is provided. The flowers of salivia are bilipped. Water B. Male flowers are carried by water currents to These highly specialized flowers present the strongest contrasts, not … How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction? (d) Air (d) Polyploid. 1 answer. Explain, why meiosis and gametogenesis are always interlinked. (a) Navaschin, Question 8. Enlist the steps of controlled cross pollination. This is thus a case cross pollination by wind, i.e., anemophily. Plants simillar to their parents can be obtained by : dehiscence of anther. answr. Give two suitable examples. (a) Synergids ii) Epihydrogamous: The pollination taking place along the surface of the wateje.g. pollen. Which one of the following fruits is parthenocarpic? is carried by wind. The pollination in the Vallisneria and seagrasses is achieved with the help of water. 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. asked Nov 4 in Biology by Rajan01 (46.2k points) class-12 +1 vote. Flowers emerge above water surface, and pollen surface of water, and pollination occurs by insects. Consequently the scion and the stock grow together and the scion becomes part of the plant into which it is grafted. (a) Banana Biology. The cell division during embryogenesis is mitotic in diploid organisms. Upvote(0) How satisfied are you with the answer? 3. Question 10. Answer: After fertilization, the ovary of a flower develops and becomes a fruit with seeds present inside. (b) Tissue isolation Cell division and no reduetional division take place. In Vallisneria pollination takes place by the agency of 1 See answer shailendras97 is waiting for your help. Fertilization then takes place and produces seeds after ripening in the protection of the female cone. Answer: ……………… is called the end of reproductive cycle. Flowers emerge above surface of water, and pollination occurs by insects. Answer: 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. 102 views. Answer: 4.Why do the pollen grains of Vallisneria have a mucilaginous covering? II. Give an example of vegetative propagation which is occurs by leaf. Identify each part in a flowering plant and write whether it is haploid (n) or diploid (2n). Pollen grains of many species can germinate on Movement of male gamete towards archegonium in prothallus of fern is : When humans are not capable for reproduction is known as ageing. (i) In Vallisneria and Hydrilla: Transfer of pollen in these hydrophytic plants takes place through water. Zygote is a diploid cell formed by fusion of male and female gametes. Which is a better mode of reproduction, sexual or asexual. pollen grains? Reproductive phase is the phase in the life cycle, where an organism possesses all the capacity and potential to reproduce sexually. Sporopollenin can be degraded by enzymes. Text Solution. So, gametogenesis is interlinked with meiosis because in meiosis reduction of chromosome number from diploid set (2n) to haploid set (n) takes place. 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. Answer: is. Juvenile phase: Pollination by water is called hydrophily and the flowers pollinated by water are said to be hydrophilous (Example: Vallisneria, Hydrilla). Related questions 0 votes. Pollen from one flower reaches the stigma of a different flower through wind. Would emasculation be needed in a cucurbit plant ? (a) Scion. Water pollination takes place in which of the following? (b) Carpel Thus, the gamete formed contains half chromosome set of the parental cell. 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. Anemophily type of pollination is found in. as, When a diploid female plant is crossed with a tetraploid male, the ploidy of Write the answer in one word/sentences: Reproduction in Organisms Very Short Answer Type Questions. The female flower rise upto the surface of water with the help of its straight long stalk which was earlier highly coiled . (d) Both (a) and (b). Class 12 Class 11 Class 10 Class 9 Class 8 Class 7 Class 6. … anemophilous-Miscropylar anemophilous-Stigmatic entomophilous-Microphlar entomophilous-Stigmatic Answer : A Related Video. Share 0. Pollen germination and pollen tube growth are regulated by chemical components of (c) Chemotactic Answer: Penicillium. They are carried by water currents reaching the female flowers and the stigma. asked Mar 10, 2018 in Class XII Biology by nikita74 (-1,017 points) principles of inheritance and variation. Female flowers float on the water attached to the plant by long stalks (to 3 m) that coil after pollination. 2.1k VIEWS. • Pollination by an abiotic agent like water is called hydrophily. The endosperm in angiospermic plant is : 1 answer. (b) Chemotropic Pollen grains of many species cause severe allergies. (b) Soft It occurs outside or inside the female body. The former is called scion (short piece of detached shoot containing several dormant buds) and the latter stock (lower portion of the plant which is fixed to the soil by its root system). In most of the water pollinated plants there is a mucilaginous covering on the pollen grains which protect it from wetting. Why is the offspring formed by asexual reproduction referred to as clone ? Differentiate between a zoospore and zygote. ← Prev Question Next Question → 0 votes . Despite the dioecism and complete separation of the flowers in Vallisneria, pollination seems to take place with remarkable Fig. 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. Male gametes in angiosperms are formed by the division of, The arrangement of the nuclei in a normal embryo sac in the dicot plants Because Self-pollination takes place between the male and female flowers of the same plant, it is not necessary to have a beautiful, large and Crispy flowers, whereas for the self-pollination it is very necessary to have beautiful, large and Crispy flowers. In a species, the weight of newborn ranges from 2 to 5 kg 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 1.5 to 5 kg die Which type of selection process is taking place ? WindC. Though there are a number of aquatic plants, only in few plants pollination takes place by water. Answer: In water hyacinth, that is, Eichhornia the flowers are purple in color, attractive and borne in a spike to facilitate pollination by insects. pollen. How does pollination take place in water hyacinth and water lily? Best answer. Its upper lip consists of two petals & lower lip consists of three petals. Write down the method of grafting. Answer: Books. Fill in the blanks: Question 1. Related questions 0 votes. Ans.As the pollination of Vallisneria takes place by means of water, the pollen grains are covered by mucilaginous coating that protects them. (b) Leeuwenhoek sac? Which one of the following represents an ovule, where the embryo sac becomes What is meant by life span? Answer: Question 17. (c) Protection, Question 3. Higher organisms have resorted to sexual reproduction inspite of its complexity.Why? (b) Insect The fusion of compatible gametes (male and female) outside the body of an organism is called external fertilization, example in Frog. (a) Haploid There is no involvement of gametes or sex cells. Reproductive units are called as gametes which are produced by specific tissues. 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Write the mode of reproduction occur in the developmental sequence of the in! Lay insects occurs as the formation of embryo from zyg – ote.. The agency of 1 See answer shailendras97 is waiting for your help is asexual in! Asexual reproduction by: a Related Video does the pollen grains from pollengrains stigma... Plants is incorrect about pollination are called as gametes which are produced by specific tissues can withstand high temperatures not...

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