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प्रश्न
Sketch and label the diagram showing self- and cross-pollination.
उत्तर
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संबंधित प्रश्न
Which mode of reproduction gives rise to variation?
What is meant by sexual reproduction?
Write one difference between asexual and sexual mode of reproduction.
What is the effect of DNA copying, which is not perfectly accurate, on the reproduction process? How does the amount of DNA remain constant though each new generation is a combination of DNA copies of two individuals?
Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
A zygote is formed as a result of fertilisation.
Give two differences between a zygote and a foetus.
Write the importance of sexual reproduction in nature.
What is the name of sex cells (other than gametes)?
Name the male and female gametes in animals.
Fill in the following blank with suitable word :
A multicellular animal starts its life from a ........... through sexual reproduction.
In which sort of reproduction are gametes involved?
Name two plants which reproduce by sexual reproduction method and two plants which reproduce by asexual reproduction methods.
The number of chromosomes in parents and offsprings of a particular species remains constant due to :
(a) doubling of chromosomes after zygote formation
(b) halving of chromosomes during gamete formation
(c) doubling of chromosomes after gamete formation
(d) halving of chromosomes after gamete formation
The correct sequence of organs in the male reproductive system for the transport of sperms is:
(a) testis → vas deferens → urethra
(b) testis → ureter → urethra
(c) testis → urethra → ureter
(d) testis → vas deferens → ureter
Define the term Implantation.
How does a single called fertilized egg grows into an adult human body?
Define the term Puberty.
Mention the common method of reproduction in Amoeba.
Mention the common method of reproduction in Flatworm.
What is sexual reproduction? List its four significances.
“The chromosomes number of the sexually reproducing parents and their offspring is the same.” Justify this statement.
In the sexual mode of reproduction, greater diversities are generated.
How is the chromosome number maintained in sexually reproducing organisms?
Answer in one sentence.
Name the endocrine glands involved in maintaining the sex characteristics of males.
Answer in one sentence.
Enlist the external genital organs in the female.
What is parthenogenesis? Give two examples from 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
How is juvenile phase different from reproductive phase?
Name the phenomenon where the female gamete directly develops into a new organism with an avian example.
In sexual reproduction, offsprings resemble the parents ______.
The end of vegetative phase in plants which marks the beginning of the reproductive phase can be easily seen in the higher plants when they come to ______.
Choose the correct answer from the options given below:
Which of the following is a post-fertilization event in flowering plants?
- Eggs of both are formed only once in a lifetime
- Both the angiosperm egg and human egg are stationary
- Both the angiosperm egg and human egg are motile transported
- Syngamy in both results in the formation of zygote
Identify the incorrect statement.
Name the two ways by which fertilisation in animals takes place.
