Question
Describe the endosperm development in angiosperms.
✓
Answer
- The endosperm development starts from the primary endosperm cell (PEC).
- In the most common type of endosperm development, the primary endosperm nucleus (PEN) undergoes repeated mitotic divisions to give rise to a number of free nuclei in the primary endosperm cell.
- The number of free nuclei formed varies greatly with the species.
- At this stage of development, the endosperm is called free-nuclear endosperm.
- Subsequently, cell wall formation occurs and the endosperm becomes cellular.
- The cells are filled with reserve food materials. Endosperm development precedes that of embryo development as an adaptation to provide assured nutrition to the embryo.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Bee keeping practice is a good income generating industry. Write the different points to be kept in mind for successful bee keeping. Write the scientific name of the most common Indian species used for the purpose.
- Why did Hershey and Chase use radioactive sulphur and radioactive phosphorus in their experiment?
- Write the conclusion they arrived at and how.
Given reasons : Only a fraction of sunlight is used for photosynthesis.
Answer the following questions:
List any four characteristics of an ideal contraceptive.
List any four characteristics of an ideal contraceptive.
- Name the causative agent of amoebiasis and mention its symptoms.
- Write how it spreads.
A patient is down with Amoebiasis. List the symptoms that confirm this infection. Name the causative pathogen.
Give reasons, why?
- Cow dung is preferred for biogas production.
- Saccharomyces cerevisiae is commonly known as baker's yeast.
This is the pedigree of a family tracing the movement of the gene for haemophilia. Explain the pattern of inheritance of the disease in the family.
Construct an ideal pyramid of energy when 10,00000 J of sunlight is available. Label all its levels.
Sketch and label sectional view of mammary gland.
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.
- By taking one example of a local plant and animal, how would you help these parents to overcome such inhibitions about reproduction and sexuality?