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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
What is meant by sexual 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?
Define Senescent phase.
Each sperm is a single cell.
An embryo is made up of a single cell.
Give two differences between a zygote and a foetus.
Differentiate between internal fertilization and external fertilization.
Advantages of sexual reproduction.
Which species is likely to have better chances of survival - the one reproducing asexually or the one reproducing sexually? Justify your answer.
What is this act of fusion called?
Give reason for the following:
The parents and off-springs of organisms reproducing sexually have the same number of chromosomes.
Multiple choice question. Tick (✓) the correct choice:
Which of the following glands is responsible for bringing about changes during adolescence in boys and girls?
- pituitary
- adrenal
- thyroid
- testis
Define the term Metamorphosis.
Mention the common method of reproduction in Start fish.
Meiosis is an essential event in the sexual life cycle of any organism. Give two reasons.
Sketch and label the diagram showing self- and cross-pollination.
What are seasonal breeders? Give an example.
Answer the following question.
It is commonly observed that parents feel embarrassed to discuss freely with their adolescent children about sexuality and reproduction. The result of this parental inhibition is that the children go astray sometimes.
Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discuss such issues with their growing children.
Answer the following question.
Which is the function of male accessory glands?
Answer the following question.
Explain the following parts of male reproductive system along with labelled diagram showing these parts- Testis, vasa deferentia, epididymis, seminal vesicle, prostate gland and penis.
What is atresia with respect to ovary in human females?
Name an organism where cell division is itself a mode of reproduction.
How is juvenile phase different from reproductive phase?
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
______ is the first stage of sexual reproduction.
Animals in which an embryo develops outside the body are called ______ animals.
Mention two inherent characteristics of Amoeba and yeast that enable them to reproduce asexually.
Suggest a possible explanation why the seeds in a pea pod are arranged in a row, whereas those in tomato are scattered in the juicy pulp.
Enumerate the differences between asexual and sexual reproduction. Describe the types of asexual reproduction exhibited by unicellular organisms.
