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Question
What is parthenogenesis? Give two examples from animals
Solution
Development of an egg into a complete individual without fertilization is known as parthenogenesis. It was first discovered by Charles Bonnet in 1745.
E.g. Honey bees, Aphis.
RELATED QUESTIONS
Define Reproductive phase
Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
The number of nuclei present in a zygote is ______.
A new human individual develops from a cell called gamete.
A zygote is formed as a result of fertilisation.
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.
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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.
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Advantages of sexual reproduction.
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In which sort of reproduction are gametes involved?
Write the various steps involved in the sexual reproduction in plants.
Give reason for the following:
The parents and off-springs of organisms reproducing sexually have the same number of chromosomes.
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
Distinguish between the following pair of terms:
Budding and Regeneration.
Mention the common method of reproduction in Hydra.
Mention the common method of reproduction in Start fish.
Name the organ involved in the following:
Passing of sperms from a man to a woman.
Answer in one sentence.
Which glands contribute fluids to the semen?
What are the different stages of sexual reproduction?
Which organs/glands produce eggs and sperms?
Which of the following is the male accessory gland?
Identify the incorrect statement.
Which of the following is a primary sex organ in a mammal?
______ fertilisation takes place in frogs and fish.
What is external fertilisation?
Sexual reproduction is characterized by ______
Zygote develop a thick wall that is resistant to dessication and damage is present in ______.
Mention two inherent characteristics of Amoeba and yeast that enable them to reproduce asexually.
