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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
Give the importance of variation in survival of species.
What is meant by sexual reproduction?
List three distinguish features between sexual and asexual types of reproduction, in tabular form.
Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
A new human individual develops from a cell called gamete.
Difference between an annual and biennial plants. Provide one example of each.
Write the importance of sexual reproduction in nature.
List any four steps involved in sexual reproduction .
Name two animals which reproduce sexually.
Define sexual reproduction.
Fill in the following blank with suitable word :
A multicellular animal starts its life from a ........... through sexual reproduction.
What are gametes?
In which sort of reproduction are gametes involved?
What is this act of fusion called?
The advantage that internal fertilisation has over external fertilisation is that in internal fertilisation :
(a) new off-springs are exactly like the parent
(b) production of large numbers of gametes is unnecessary
(c) copulation and fusion of gametes is passive
(d) fewer individuals are produced
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
One of the following process does not lead to the formation of clones. This is :
(a) fission
(b) fertilisation
(c) fragmentation
(d) tissue culture
Distinguish between the following pair of terms:
Sexual reproduction and asexual reproduction.
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 Puberty.
Define the term Metamorphosis.
Mention the common method of reproduction in Flatworm.
Mention the common method of reproduction in Start fish.
Describe the various stages in the life cycle of a butterfly.
In the sexual mode of reproduction, greater diversities are generated.
Answer in one sentence.
Enlist the external genital organs in the female.
Explain the histological structure of testis.
Write an account of the seminal vesicle and bulbourethral gland in the male reproductive system.
Match column -1 with column - II and select the correct option.
| Column - I | Column - II | ||
| 1. | Seminal vesicles | a. | Membranous urethra |
| 2. | Scrotum | b. | Thermoregulatory |
| 3. | Tunica vaginalis | c. | Fibro muscular pouches |
| 4. | Cowper's gland | d. | Peritoneal covering |
Choose the correct answer from the options given below:
Which of the following statements, support the view that elaborate sexual reproductive process appeared much later in the organic evolution.
- Lower groups of organisms have simpler body design
- Asexual reproduction is common in lower groups
- Asexual reproduction is common in higher groups of organisms
- The high incidence of sexual reproduction in angiosperms and vertebrates
Which of the following is a primary sex organ in a mammal?
______ fertilisation takes place in frogs and fish.
Animals in which an embryo develops outside the body are called ______ animals.
In ______ animals, the development of the embryo takes place inside the body.
What are oviparous animals?
Enumerate the differences between asexual and sexual reproduction. Describe the types of asexual reproduction exhibited by unicellular organisms.
