Recent questions tagged sec-b

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

asked Feb 9 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 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 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 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 by priyanka.clay6

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

asked Feb 8 by priyanka.clay6

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What are the stages of embryogeny in a Dicotyledonous embryo ?

asked Feb 8 by priyanka.clay6

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How does geitonogamy differ from xenogamy in plants ?

asked Feb 8 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 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 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 by priyanka.clay6

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How could pollen grains be well preserved as fossils ?

asked Feb 8 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 by priyanka.clay6

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Identify the given figure and label the parts. <img src="http://clay6.com/mpaimg/111_A.jpg "/>

asked Feb 8 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 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 by priyanka.clay6

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Observe the following diagram and answer the questions given at the end <img src="http://clay6.com/mpaimg/110_A.jpg "/> a. Why should the polar nuclei fuse ? b. What facilitates the entry of male gamete into the ovule ?

asked Feb 8 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 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 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 by priyanka.clay6

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

asked Feb 7 by priyanka.clay6

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Name the asexual reproductive structures of the following: Chlamydomonas, Penicillum, Hydra, Sponge.

asked Feb 6 by priyanka.clay6

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Life spans of organisms are not necessarily correlated with their sizes. Explain

asked Feb 6 by priyanka.clay6

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How do the following organisms reproduce? Yeast, Amoeba.

asked Feb 6 by priyanka.clay6

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Gametes are always haploid .How are the gametes produced from a haploid plant body and a diploid plant body?

asked Feb 6 by priyanka.clay6

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Differentiate between asexual and sexual method of reproduction.

asked Feb 6 by priyanka.clay6

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What will happen if meiosis does not take place during gametogenesis?

asked Feb 6 by priyanka.clay6

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Arrange the following events in proper sequence: a. Embryogenesis b. Fertilization c. Gametogenesis d. Zygote formation.

asked Feb 6 by priyanka.clay6

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Can we refer the off-springs formed by asexual reproduction, as a clone? If yes, why?

asked Feb 6 by priyanka.clay6

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Why dogs and cats have oestrus cycle but human beings have menstrual cycle, though all are mammals?

asked Feb 6 by priyanka.clay6

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Name the process of development of embryo from the zygote. What are the two changes which the zygote undergoes during this process?

asked Feb 6 by priyanka.clay6

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Though ginger is found under the soil. Yet it is not a root, but stem. Justify your answer with two reasons. (ii) What are the specialized cells which undergo meiosis in the diploid organisms, called as?

asked Feb 6 by priyanka.clay6

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Why can't man be oviparous? Justify the statement.

asked Feb 6 by priyanka.clay6

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Label A and B and write the type of the vegetative propagule. <img src="http://clay6.com/mpaimg/122_A.jpg"/>

asked Feb 6 by priyanka.clay6

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Identify the given plants. How are they different from each other with regard to reproductive organs they possess ? <img src="http://clay6.com/mpaimg/120_A.jpg "/>

asked Feb 6 by priyanka.clay6

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Sexual reproduction involves fertilization and the formation of embryo. What are the critical events needed for the successful reproduction process?

asked Feb 6 by priyanka.clay6

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Categorise the following plants based on the floral characteristics: Hibiscus, Cucumber, Papaya, Guava.

asked Feb 6 by priyanka.clay6

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Do you agree with the statement only asexual reproduction can give rise to individuals resembling their parent? Support your answer with an example.

asked Feb 6 by priyanka.clay6

1 answer

In non-primate mammals like cows, sheep, rats, deer etc, the cyclical changes that occur during reproduction are called oestrus cycle whereas in primates it is called as menstrual cycle. How can we distinguish between them?

asked Feb 6 by priyanka.clay6

1 answer

Reptiles and frogs are oviparous animals; yet they differ in certain aspects of reproduction. Bring out the differences and mention which of the two animals has more advantage. Give one reason.

asked Feb 6 by priyanka.clay6

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Give the chromosome number in the gametes of the following, if the number of chromosomes in their meiocytes is as follows: a. Dog-78 b.Rice – 24 c. Housefly – 12 d. Butterfly -380

asked Feb 5 by priyanka.clay6

1 answer

Fill in the missing columns: <img src="http://clay6.com/mpaimg/86_A.jpg"/>

asked Feb 5 by priyanka.clay6

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$2\sin ^2\large\frac{3\pi}{4}$$+2\cos^2\large\frac{\pi}{4}$$+2\sec^2\large\frac{\pi}{3}$ =

asked Jul 3, 2018 by pady_1

1 answer

A few statements are given below followed by a set of terms. Pick the correct term and write it agai

asked Jul 20, 2017 by pady_1

1 answer

What do you understand by Snow-blindness?

asked Jul 12, 2017 by pady_1

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It is a common practice to plant trees and shrubs near the boundary walls of the buildings. What pur

asked Jul 12, 2017 by pady_1

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Name one green house gas and its possible source of production on a large scale. What are the harmfu

asked Jul 12, 2017 by pady_1

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Is it true that if the dissolved oxygen level drops to zero, the water will become septic. Give an e

asked Jul 12, 2017 by pady_1

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Is it true that carpets and curtain/drapes placed on the floor or wall surface can reduce the noise

asked Jul 12, 2017 by pady_1

1 answer

What is cultural eutrophication?

asked Jul 12, 2017 by pady_1

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