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प्रश्न
Which mode of reproduction gives rise to variation?
उत्तर
Sexual reproduction gives rise to variation.
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संबंधित प्रश्न
Complete the following table to get the differences between asexual and sexual reproduction:
| Characteristics | Asexual Reproduction | Sexual Reproduction |
| Number of parents involved | ........................... | .............................. |
| Type of cells involved | Somatic cells | Germ cells |
| Type of cell division | ............................ | Meiosis and mitosis |
What are chromosomes?
How do organisms, whether reproduced asexually or sexually maintain a constant chromosome number through several generations? Explain with the help of suitable example.
Define Reproductive phase
Internal fertilisation occurs ______.
Oviparous animals give birth to young ones.
A zygote is formed as a result of fertilisation.
An embryo is made up of a single cell.
Difference between an annual and biennial plants. Provide one example of each.
Which species is likely to have better chances of survival - the one reproducing asexually or the one reproducing sexually? Justify your answer.
Fill in the following blank with suitable word :
The cells involved in sexual reproduction are called .............
Name two plants which reproduce by sexual reproduction method and two plants which reproduce by asexual reproduction methods.
Characters that are transmitted from parents to offspring during sexual reproduction show :
(a) only similarities with parents
(b) only variations with parents
(c) both similarities and variations with parents
(d) neither similarities nor variations with parents
How does a single called fertilized egg grows into an adult human body?
Differentiate between the following:
External fertilisation and Internal fertilisation.
Define the term Adolescence.
Mention the common method of reproduction in Amoeba.
Mention the common method of reproduction in Flatworm.
Mention the functions of Oviduct.
Name the organ involved in the following:
Passing of sperms from a man to a woman.
Mention the changes which occur during adolescence in humans.
Answer the following question.
Explain the histological structure of ovary in human.
Give an account of external genitalia in human females.
Describe the histology of testis with help of labelled diagram.
Identify the labels from the given diagram.
Choose the correct statement from the following
Give reason for the following:
Some organisms like honey bees are called parthenogenetic animals
Identify the INCORRECT statement.
Animals in which an embryo develops outside the body are called ______ animals.
In ______ animals, the development of the embryo takes place inside the body.
Reproduction is essentially a phenomenon that is not for survival of an individual but for the stability of a species. Justify.
Zygote develop a thick wall that is resistant to dessication and damage is present in ______.
With which type of reproduction do we associate the reduction division? Analyse the reasons for it.
Suggest a possible explanation why the seeds in a pea pod are arranged in a row, whereas those in tomato are scattered in the juicy pulp.
Enumerate the differences between asexual and sexual reproduction. Describe the types of asexual reproduction exhibited by unicellular organisms.
Rose plants produce large, attractive bisexual flowers but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.
Both these plants - rose and tomato - both selected by human beings for different characteristics, the rose for its flower and tomato for its fruit. Roses, being vegetatively propagated do not need to produce seeds.
Which is a better mode of reproduction, sexual or asexual? Why?
