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प्रश्न
Give reason for the following:
Some organisms like honey bees are called parthenogenetic animals
उत्तर
Among honey bees, the queen bee and worker bees develop from fertilized eggs whereas the drones develop from unfertilized eggs. Hence the honey bees are parthenogenetic animals showing incomplete parthenogenesis.
संबंधित प्रश्न
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?
What are the advantages of sexual reproduction over asexual reproduction?
An embryo is made up of a single cell.
Give two differences between a zygote and a foetus.
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.
Differentiate between Parthenocarpy and Parthenogenesis. Give one example of each.
Define sexual reproduction.
Name the organ which produces female sex cells.
What is this act of fusion called?
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 offsprings formed as a result of sexual reproduction exhibit more variations because ______
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
Differentiate between the following:
External fertilisation and Internal fertilisation.
Define the term Puberty.
Describe the different methods of asexual reproduction in animals.
Adolesecence is considered a critical stage in the life of boys and girls. Explain this statement.
What are seasonal breeders? Give an example.
Answer the following question.
Explain the process of fertilization in humans.
Identify the correct sequence of events.
In sexual reproduction, offsprings resemble the parents ______.
Sexual reproduction can be grouped into ______ distinct states.
Which of the following is a primary sex organ in a mammal?
______ lay thousands and sometimes millions of small, soft eggs in water.
Mention two inherent characteristics of Amoeba and yeast that enable them to reproduce asexually.
With which type of reproduction do we associate the reduction division? Analyse the reasons for it.
Which is a better mode of reproduction, sexual or asexual? Why?
