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प्रश्न
Sketch and label the diagram showing self- and cross-pollination.
उत्तर
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संबंधित प्रश्न
List six specific characteristics of sexual reproduction.
How do organisms, whether reproduced asexually or sexually maintain a constant chromosome number through several generations? Explain with the help of suitable example.
What are the advantages of sexual reproduction over asexual reproduction?
Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
Internal fertilisation occurs ______.
In which female reproductive organ does the embryo get embedded?
Complete the crossword puzzle using the hints given below.
Across
1. The process of the fusion of the gametes.
6. The type of fertilisation in hen.
7. The term used for bulges observed on the sides of the body of Hydra.
8. Eggs are produced here
Down
2. Sperms are produced in these male reproductive organs.
3. Another term for the fertilised egg.
4. These animals lay eggs.
5. A type of fission in amoeba.
Differentiate between Parthenocarpy and Parthenogenesis. Give one example of each.
Write the various steps involved in the sexual reproduction in plants.
Name two plants which reproduce by sexual reproduction method and two plants which reproduce by asexual reproduction methods.
The offsprings formed as a result of sexual reproduction exhibit more variations because ______
Define the term Fetilization.
Define the term Implantation.
Define the term Puberty.
What is the function of uterus?
Find the odd one out, give reason:
Testes, epididymis, uterus, vas deferens
Define the term Puberty.
Mention the common method of reproduction in Hydra.
Describe the different methods of asexual reproduction in animals.
Answer in one sentence.
Enlist the external genital organs in the female.
Explain the histological structure of testis.
Answer the following question.
Explain the histological structure of ovary in human.
Answer the following question.
Explain the following parts of male reproductive system along with labelled diagram showing these parts- Testis, vasa deferentia, epididymis, seminal vesicle, prostate gland and penis.
What is atresia with respect to ovary in human females?
Animals which give birth to young ones directly are named as ______.
Choose the correct statement from the following:
Give reason for the following:
Some organisms like honey bees are called parthenogenetic animals
Give reason for the following:
A male honey bee has 16 chromosomes whereas a female has 32 chromosomes.
Differentiate between the following:
Regeneration in lizard and Planaria
Identify the correct sequence of events.
What is external fertilisation?
Explain the two types of fertilization.
Reproduction is essentially a phenomenon that is not for survival of an individual but for the stability of a species. Justify.
Between an annual and a perennial plant, which one has a shorter juvenile phase? Give one reason.
Justify the statement ‘Vegetative reproduction is also a type of asexual reproduction’.
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?
