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Answers posted by priyanka.clay6

2010
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Fertilization leads to the formation of embryo.
a. Give the technical term for the development of embryo.
b. What are the events that occur during embryo development?
c. The development of zygote depends on two factors. What are they?
d. How will you categorise animals based on the development of zygote inside or outside the female body?
e. How does zygote in fungi and algae overcome dessication?
answered Feb 7, 2019
a. Embryogenesisb. Cell division and cell differentiationc. The two factors are whether the zygote w...
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Study the following diagram and answer the questions given below:
answered Feb 7, 2019
a. S –Seeds; P-Pericarpb. Seeds develop from ovule and Pericarp from ovary wallc. Placentationd. Emb
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Why is vegetative propagation considered as asexual reproduction? Which is better mode: Sexual or asexual? Why?
answered Feb 7, 2019
Vegetative propagation onvolves only one parent. Hence it is considered as asexual reproduction. Sex...
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Distinguish between gametogenesis and embryogenesis.
answered Feb 7, 2019
https://clay6.com/mpaimg/95_A.jpg
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Complete the flowchart with reference to the reproduction of flower.
answered Feb 7, 2019
A-PollinationB- Seeds germinate into plantsC- Produce flowers
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Can we consider simple cell division as a method of reproduction? What will you call this kind of reproduction? Give two examples in support of your answer.
answered Feb 7, 2019
In unicellular organisms, cell division is synonymous with method of reproduction. Asexual reproduct...
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In a pond ecosystem you may find the plant with purple flowers that spread very fast to cover the entire pond within a short span of time. How does it spread? How does it harm the aquatic body?
answered Feb 7, 2019
Water hyacinth. It propagates vegetatively. It drains oxygen from the water body, killing the fish.
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Give the term for kinds of gametes in the given figures A and B . In the figure A give the specific terms for the gametes.
answered Feb 7, 2019
A-HeterogametesB-HomogametesEgg/Ovum and Sperms are the terms respectively.
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Give the term for the following figure A,B and C.
answered Feb 7, 2019
A-Fusion of gamtesB-ZygoteC-New individual
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What are oviparous and viviparous animals? Give examples.
answered Feb 7, 2019
Oviparous animals are the ones that lay eggs which hatch after incubation period and young ones come...
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What is parthenogenesis? Give an example.
answered Feb 7, 2019
Development of female gamete into new organisms without undergoing fertilization is parthenogenesis....
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Write the sexuality in the following organisms.
(a) Earthworm
(b) Cockroach
(c) Chara
(d) Marchantia
(e) Sweet Potato
(f) Leech.
answered Feb 7, 2019
Earthworm- BisexualCockroach-UnisexualChara- MonoeciousMarchantia- DioeciousSweet potato- BisexualLe...
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Explain the features exhibited by the organisms showing external fertilization to Enhance the chances of syngamy .What is the disadvantage of external fertilization ?
answered Feb 6, 2019
There is a great synchrony between the sexes and they produce large number of gametes in watery medi...
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Name the asexual reproductive structures of the following: Chlamydomonas, Penicillum, Hydra, Sponge.
answered Feb 6, 2019
Zoospores-ChlamydomonasConidia-PenicilliumBuds-HydraGemmules_sponges
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Life spans of organisms are not necessarily correlated with their sizes. Explain
answered Feb 6, 2019
Size of crow and parrot are not very different ,life span is 15 and 140 years
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How do the following organisms reproduce? Yeast, Amoeba.
answered Feb 6, 2019
Yeast by budding ; Amoeba by binary fission
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Gametes are always haploid .How are the gametes produced from a haploid plant body and a diploid plant body?
answered Feb 6, 2019
Through mitosis in haploid plant body and through meiosis in diploid plant body.
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Differentiate between asexual and sexual method of reproduction.
answered Feb 6, 2019
https://clay6.com/mpaimg/91_A.jpg
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What will happen if meiosis does not take place during gametogenesis?
answered Feb 6, 2019
Gametes will be diploid and when diploid gametes fuse, chromosome number that is constant for a spec...
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Arrange the following events in proper sequence:
a. Embryogenesis
b. Fertilization
c. Gametogenesis
d. Zygote formation.
answered Feb 6, 2019
Gametogenesis Fertilization Zygote formation Embryogenesis
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Can we refer the off-springs formed by asexual reproduction, as a clone? If yes, why?
answered Feb 6, 2019
Yes. They are morphologically and genetically similar to the mother.
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Why dogs and cats have oestrus cycle but human beings have menstrual cycle, though all are mammals?
answered Feb 6, 2019
Dogs and cats are seasonal breeders having heat period during which ovulation takes place but human ...
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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?
answered Feb 6, 2019
Embryogenesis. Cell differentiation and organogenesis
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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?
answered Feb 6, 2019
Ginger has nodes and internodes. Hence it is a stem. Meiocyte
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Why can't man be oviparous? Justify the statement.
answered Feb 6, 2019
Man is a placental animal having adaptation to give birth.
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Label A and B and write the type of the vegetative propagule.
answered Feb 6, 2019
A- EyesB- Germinating Eye BudsType: Tuber
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Identify the given plants.
How are they different from each other with regard to reproductive organs they possess ?
answered Feb 6, 2019
A is Monoecious (Chara) and B is dioecious.Monoecious plant has both androecium and gynoecium.Dioeci...
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Sexual reproduction involves fertilization and the formation of embryo. What are the critical events needed for the successful reproduction process?
answered Feb 6, 2019
Gametogenesis where in gametes are formed and Syngamy where in male and female gametes fuse are the ...
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Categorise the following plants based on the floral characteristics: Hibiscus, Cucumber, Papaya, Guava.
answered Feb 6, 2019
Hibiscus and Guava-Bisexual flowersCucumber and Papaya-Unisexual flowers
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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.
answered Feb 6, 2019
No, because through parthenogenesis we get individuals resembling parents. Example: Rotifers, honeyb...
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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?
answered Feb 6, 2019
https://clay6.com/mpaimg/88_A.jpg
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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.
answered Feb 6, 2019
Reptiles exhibit internal fertilization while frogs are fertilized externally. Reptiles have a great...
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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
answered Feb 5, 2019
a. Dog- 39b. Rice-12c. Housefly- 6d. Butterfly-190
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Fill in the missing columns:
answered Feb 5, 2019
A-ConidiumB-BudsC-SpongesD-Agave
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In seed plants how are the non-motile gametes carried to female gamete?
answered Feb 5, 2019
The pollen lands on the stigma either through cross pollination or self pollination. A pollen tube i...
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Name the plant which flower only once in their life time.
answered Feb 5, 2019
Bamboo.
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Name the type of plants that show clear cut vegetative, reproductive and senescent phases.
answered Feb 5, 2019
Annuals and biennials show clear cut demarcation while in perennials ,its difficult to distinguish t...
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What is a vegetative phase in plants?
answered Feb 5, 2019
The period of growth where in plants grow and mature in their life to reproduce sexually is called v...
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What do you mean by clones?
answered Feb 5, 2019
Individuals that are morphologically and genetically similar to one another and are exact replica of...
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Name the structure from where every sexually reproducing organism begins their life.
answered Feb 5, 2019
Zygote
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Name the type of fertilization wherein the survival of the organism up to adulthood is threatened.
answered Feb 5, 2019
External fertilization
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Name the scientific name of the plant which flower once in 12 years.
answered Feb 5, 2019
Strobilanthus Kunthiana Kurinji.
0 votes
Name the stage of growth and maturity in the life of animals before they can reproduce sexually.
answered Feb 5, 2019
Juvenile phase in animals and Vegetative phase in plants.
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The type of reproduction wherein the off springs produced are identical to each other and to the parent.
answered Feb 5, 2019
Asexual reproduction
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What is the significance of reproduction?
answered Feb 5, 2019
Reproduction helps in perpetuation of species.
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In a culture there is a mixture of haploid and diploid cells. It must be because of a) Generative cells b) Vegetative cells c) anther wall d) pollen cells
answered Feb 5, 2019
Anther wall because it has sporogenous tissue which is diploid and undergoes meiosis to produce hapl...
0 votes
Why do organisms like algae and fungi which normally adopt asexual reproduction switch over to sexual method of reproduction just before the onset of adverse conditions?
answered Feb 5, 2019
Organisms such as fungi and algae switch to sexual mode of reproduction dur...
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Most sugarcane varieties cultivated today are aneuploids and are sterile. But they grow and perform extremely well. Sterility in sugarcane is not of any disadvantage. Why?
answered Feb 5, 2019
Sugarcane reproduces asexually.
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If a branch “dasheri mango” is grafted on a tree producing “desi mangoes” what type of mangoes will be borne on grafted branch& other branches of the plant?
answered Feb 5, 2019
Grafted branch will give “dasheri” mango and the other branches will produce “desi” mangoes....
0 votes
Fertilization results in the production of zygote. Zygote is called as a vital link. Why is it called so?
answered Feb 5, 2019
Zygote is a result of fusion of a male and a female gamete. The zygote develops into complete organi...
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