Recent questions tagged sec-b

How do the following organisms reproduce? Yeast, Amoeba.

asked Feb 6, 2019 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, 2019 by priyanka.clay6

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Differentiate between asexual and sexual method of reproduction.

asked Feb 6, 2019 by priyanka.clay6

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

asked Feb 6, 2019 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, 2019 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, 2019 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, 2019 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, 2019 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, 2019 by priyanka.clay6

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

asked Feb 6, 2019 by priyanka.clay6

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Label A and B and write the type of the vegetative propagule.

asked Feb 6, 2019 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 ?

asked Feb 6, 2019 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, 2019 by priyanka.clay6

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

asked Feb 6, 2019 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, 2019 by priyanka.clay6

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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, 2019 by priyanka.clay6

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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, 2019 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, 2019 by priyanka.clay6

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Fill in the missing columns:

asked Feb 5, 2019 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

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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

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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

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What is cultural eutrophication?

asked Jul 12, 2017 by pady_1

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Is it true that there is more solar energy available in the tropics? Explain briefly.

asked Jul 11, 2017 by pady_1

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Is it possible that productivity and diversity of natural communities remain constant over a time of

asked Jul 11, 2017 by pady_1

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Define the terms (i) Bioprospecting (ii) Endemism

asked Jul 11, 2017 by pady_1

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Why is genetic variation important in the plant Rauwolfia vomitoria?

asked Jul 11, 2017 by pady_1

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Explain as to how protection of biodiversity hot spots alone can reduce upto 30% of the current rate

asked Jul 11, 2017 by pady_1

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What accounts for the greater ecological diversity of India?

asked Jul 11, 2017 by pady_1

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Primary productivity varies from ecosystem to ecosystem. Explain.

asked Jul 11, 2017 by pady_1

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Poaching of tiger is a burning issue in today's world. What implication would this activity have on

asked Jul 11, 2017 by pady_1

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Human activities interfere with carbon cycle. List any two such activities. 

asked Jul 11, 2017 by pady_1

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What would be the reason for the faster rate of decomposition in the tropics? 

asked Jul 11, 2017 by pady_1

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Climax stage is achieved quickly in secondary succession as compared to primary succession. Why?

asked Jul 11, 2017 by pady_1

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Arrange the following as observed in vertical stratification of a forest : Grass, Shrubby plants, te

asked Jul 11, 2017 by pady_1

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In an aquarium two herbivorous species of fishes are living together feeding on phytoplanktons. As p

asked Jul 10, 2017 by pady_1

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Lianas are vascular plants rooted in the ground and maintain erectness of their stem by making use o

asked Jul 10, 2017 by pady_1

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The density of a population in a habitat per unit area is measured in different units. Write the uni

asked Jul 10, 2017 by pady_1

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Categorise the following plants into hydrophytes, halophytes, mesophytes and xerophytes. Give reason

asked Jul 10, 2017 by pady_1

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Why do submerged plants receive weaker illumination than exposed floating plants in a lake?

asked Jul 10, 2017 by pady_1

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Why do fresh water organisms have contractile vacuoles whereas majority of marine organisms lack the

asked Jul 10, 2017 by pady_1

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If a fresh water fish is placed in an aquarium containing seawater, will the fish be able to survive

asked Jul 10, 2017 by pady_1

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What is brood parasitism? Explain with the help of an example.

asked Jul 10, 2017 by pady_1

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Define Ectoparasite and endoparasite with suitable example.

asked Jul 10, 2017 by pady_1

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What is high altitude sickness? Write its symptoms. 

asked Jul 10, 2017 by pady_1

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What is a diapause and its significance?

asked Jul 10, 2017 by pady_1

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