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प्रश्न
Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
उत्तर
Although sexual reproduction involves more time and energy, higher organisms have resorted to sexual reproduction in spite of its complexity. This is because this mode of reproduction helps introduce new variations in progenies through the combination of the DNA from two (usually) different individuals. These variations allow the individual to cope with various environmental conditions and thus, make the organism better suited for the environment. Variations also lead to the evolution of better organisms and therefore, provide better chances of survival. On the other hand, asexual reproduction does not provide genetic differences in the individuals produced.
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संबंधित प्रश्न
In which female reproductive organ does the embryo get embedded?
Difference between an annual and biennial plants. Provide one example of each.
State the basic requirement for sexual reproduction?
Write the importance of sexual reproduction in nature.
Advantages of sexual reproduction.
Explain how, in sexually reproducing organisms, the number of chromosomes in the progeny is maintained.
What is the name of sex cells (other than gametes)?
name the organ which produces male sex cells.
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.
What would be the ratio of chromosome number between an egg and its zygote?
The offsprings formed as a result of sexual reproduction exhibit more variations because ______
Put a tick mark (✓) against the correct alternative in the following statement:
Amoeba is most commonly reproduced by:
Put a tick mark (✓) against the correct alternative in the following statement:
Which one of the following represents the correct sequence in the life history of a butterfly ?
- Egg → Larva → Adult → Pupa
- Egg → Pupa → Adult → Larva
- Egg → Larva → Pupa → Adult
- Egg → Pupa → Larva → Adult
Define the term Fetilization.
Find the odd one out, give reason:
Testes, epididymis, uterus, vas deferens
Differentiate between the following:
External fertilisation and Internal fertilisation.
Mention the common method of reproduction in Amoeba.
Mention the functions of Oviduct.
What is sexual reproduction? List its four significances.
Sketch and label the diagram showing self- and cross-pollination.
How is the chromosome number maintained in sexually reproducing organisms?
Answer in one sentence.
Enlist the external genital organs in the female.
Long answer question.
Describe female reproductive system of human.
What is atresia with respect to ovary in human females?
Describe the histology of testis with help of labelled diagram.
Write an account of the seminal vesicle and bulbourethral gland in the male reproductive system.
What are the different stages of sexual reproduction?
Choose the correct statement from the following:
Choose the correct statement from the following
What is parthenogenesis? Give two examples from animals
Name the phenomenon where the female gamete directly develops into a new organism with an avian example.
Which of the following is a primary sex organ in a mammal?
The zygote divides repeatedly into a group of cells, which develops into different tissues and organs constituting a full body. This structure is known as ______.
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.
'Fertilisation is not an obligatory event for fruit production in certains plants'. Explain the statement.
Enumerate the differences between asexual and sexual reproduction. Describe the types of asexual reproduction exhibited by unicellular organisms.
