Recent questions tagged cbsc

“Dehydration of seed increases their shelf life” – Explain Cleistogamous flowers are strictly self pollinating,” Explain. What is the disadvantage of this phenomenon?

asked Feb 11, 2019 by priyanka.clay6

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A student wants to know the ploidy of coconut. After studying its different parts he inferred the ploidy of the following parts. Check whether the student is correct. a. Water inside the fruit - n b. White Kernal - 2n c. Seed coat - n d. Embryo - 3n e. Tepal - 2n

asked Feb 11, 2019 by priyanka.clay6

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Define triple fusion. What is the product of this process ? What does the product develop into ?

asked Feb 11, 2019 by priyanka.clay6

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Generally nucellus does not persist in mature seeds. Cite two examples which show persistence of nucellus in the seed and what name is given to the persistent nucellulus ?

asked Feb 11, 2019 by priyanka.clay6

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What do you means by seed dormancy ? What is its significance ?

asked Feb 11, 2019 by priyanka.clay6

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What are advantages of seeds to Angiosperms ?

asked Feb 11, 2019 by priyanka.clay6

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Explain free nuclear endosperm development.

asked Feb 11, 2019 by priyanka.clay6

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What is pollination and explain its types ?

asked Feb 11, 2019 by priyanka.clay6

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Explain double fertilization schematically.

asked Feb 11, 2019 by priyanka.clay6

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Explain the structure of pollen grain.

asked Feb 11, 2019 by priyanka.clay6

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Explain the structure of microsporangium.

asked Feb 11, 2019 by priyanka.clay6

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Differentiate between microsporogenesis and megasporogenesis. What type of cell divisions occur in these ? Name the two structures formed at the end of these two events.

asked Feb 11, 2019 by priyanka.clay6

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Continued self pollination leads to inbreeding depression. List three devices which flowering plants have developed to discourage self pollination.

asked Feb 11, 2019 by priyanka.clay6

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How is pollination effected in Vallisneria ?

asked Feb 11, 2019 by priyanka.clay6

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Differentiate between monoecious and dioecious plants, with an example for each.

asked Feb 11, 2019 by priyanka.clay6

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Enumerate the steps in artificial hybridisation.

asked Feb 11, 2019 by priyanka.clay6

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Trace the development of the mature ovule from a megaspore mother cell.

asked Feb 11, 2019 by priyanka.clay6

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Explain the phenomenon of double fertilization in angiospermic plants.

asked Feb 9, 2019 by priyanka.clay6

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List any three mechanisms plants follow to overcome inbreeding depression.

asked Feb 9, 2019 by priyanka.clay6

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"Apomictic genes are trying to be inserted in hybrid varieties". Explain.

asked Feb 9, 2019 by priyanka.clay6

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Pollination and seed formation are very crucial for fruit formation. How will you explain this statement ?

asked Feb 9, 2019 by priyanka.clay6

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What is the fate of the following in the development of fruit and seed ?

asked Feb 9, 2019 by priyanka.clay6

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If one can induce parthenocarpy through the application of phytohormones, which fruit would you select to induce parthenocarpy and why ?

asked Feb 9, 2019 by priyanka.clay6

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How does the flower of maize and cannabis are pollinated ? What are the features found in these flowers for such type of pollination ?

asked Feb 9, 2019 by priyanka.clay6

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Your friend would like to cross-pollinate the bisexual flower. How can you guide him to be successful in his experiment ?

asked Feb 8, 2019 by priyanka.clay6

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What will be the fate of ovule if the synergids are absent in the embryo sac ?

asked Feb 8, 2019 by priyanka.clay6

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Why do you think that the zygote is dormant for some time in a fertilized ovule ?

asked Feb 8, 2019 by priyanka.clay6

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How long do the seeds remain alive after they are dispersed ?

asked Feb 8, 2019 by priyanka.clay6

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What are the stages of embryogeny in a Dicotyledonous embryo ?

asked Feb 8, 2019 by priyanka.clay6

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How does geitonogamy differ from xenogamy in plants ?

asked Feb 8, 2019 by priyanka.clay6

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Why is the process of fertilization in flowering plant referred to as double fertilization ? Explain.

asked Feb 8, 2019 by priyanka.clay6

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How many haploid nuclei and haploid cells are present in the female gametophyte of angiosperm ?

asked Feb 8, 2019 by priyanka.clay6

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What are the effects of pollen in some people and how are the pollen grains are being used as food supplements ?

asked Feb 8, 2019 by priyanka.clay6

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How could pollen grains be well preserved as fossils ?

asked Feb 8, 2019 by priyanka.clay6

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Of the eight nuclei of the embryo sac in flowering plants three are at the micropylar end. How many are there at the chalazal end and how many nuclei located in the central cell ?

asked Feb 8, 2019 by priyanka.clay6

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Identify the given figure and label the parts.

asked Feb 8, 2019 by priyanka.clay6

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In what ways does the study of pollination enrich our understanding of Biology and enable us to apply it for increasing crop productivity ?

asked Feb 8, 2019 by priyanka.clay6

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If a certain plant when introduced into a new environment neither produces seeds nor does it respond to vegetative propagation. Hoe can more plants be produced ?

asked Feb 8, 2019 by priyanka.clay6

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Observe the following diagram and answer the questions given at the end

asked Feb 8, 2019 by priyanka.clay6

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How would you explain seed set in papaya in the absence of male plant in close vicinity of a female plant ?

asked Feb 8, 2019 by priyanka.clay6

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Give reason : a. Angiosperms show the process of double fertilization. b. Flowers in Salvia plants show stamens with lever mechanisms.

asked Feb 7, 2019 by priyanka.clay6

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Note the relationship between the first two words and suggest a suitable word for the fourth place. a. Euphorbia : Cyathium : Ocimum : _ b. Mango : Eucarp : Apple : __

asked Feb 7, 2019 by priyanka.clay6

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"Incompatibility is a natural barrier in the fusion of gametes". Justify the statement.

asked Feb 7, 2019 by priyanka.clay6

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If the number of chromosomes in the leaf cell of a flowering plant is 28. What number would you expect in the embryo and endosperm ?

asked Feb 7, 2019 by priyanka.clay6

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Complete the flow chart.

asked Feb 7, 2019 by priyanka.clay6

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Identify the figure given below and label the parts indicated in the figure.

asked Feb 7, 2019 by priyanka.clay6

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T.S of anther shows four layers in the wall-epidermis, endothelium, tapetum and middle layer. Arrange them from outermost to innermost.

asked Feb 7, 2019 by priyanka.clay6

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Non-albuminous seeds do not have endosperm, then from where do they take the food during germination ?

asked Feb 7, 2019 by priyanka.clay6

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Do pollen grains survive in adverse conditions ?

asked Feb 7, 2019 by priyanka.clay6

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If the diploid number of chromosomes in 16 in an organism, mention the number of chromosomes in antipodals and endosperm.

asked Feb 7, 2019 by priyanka.clay6

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