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प्रश्न
Examine a few flowers of any cucurbit plant and try to identify the staminate and pistillate flowers. Do you know any other plant that bears unisexual flowers?
उत्तर
The male or staminate flowers of cucurbits bear bright coloured petals and a prominent group of stamens. Male plants or staminate flowers do not bear fruits. The female or pistillate flowers bear fruits. In a fertilised young pistillate flower very small fruit is visible below petals and sepals. Some unisexual plants are : Papaya, Mulberry and Date-palm
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संबंधित प्रश्न
Explain the importance of syngamy and meiosis in a sexual life cycle of an organism.
Explain why meiosis and gametogenesis are always interlinked?
Identify each part in a flowering plant and write whether it is haploid (n) or diploid (2n).
Ovary ———————————
Anther ———————————
Egg ———————————
Pollen ———————————
Male gamete ———————————
Zygote ———————————
Differentiate between gametogenesis from embryogenesis.
State the fate of a pair of autosomes during gamete formation.
Mention the ploidy of the different types of cells present in the female gametophyte of an angiosperm.
The following question(s)/statement(s) has four suggested answers. Choose the correct option in the following case.
After fertilisation, the integuments of an ovule develop into : __________.
External fertilisation occurs in majority of ______.
Choose the correct statements.
Given below are a few statements related to external fertilization.
- The male and female gametes are formed and released simultaneously
- Only a few gametes are released into the medium
- Water is the medium in a majority of organisms exhibiting external fertilization
- Offspring formed as a result of external fertilization have better chance of survival than those formed inside an organism
In flowering plants both male and female gametes are non-motile. The method to bring them together for fertilization is ______.
Development of an egg without fertilization is called ______.
The number of chromosomes in the shoot tip cells of a maize plant is 20. The number of chromosomes in the microspore mother cells of the same plant shall be ______.
Which is correct?
Meiosis is best observed in dividing ______.
Which plant will lose its economic value if its fruits are produced by induced parthenocarpy?
Meiosis takes place in ______.
Which of the following process is associated with a change in the cellular DNA amount?
Give reasons as to why cell division cannot be a type of reproduction in multicellular organisms.
In haploid organisms that undergo sexual reproduction, name the stage in the life cycle when meiosis occurs. Give reasons for your answer.
Do all the gametes formed from a parent organism have the same genetic composition (identical DNA copies of the parental genome)? Analyse the situation with the background of gametogenesis and provide or give suitable explanation.
