What is the function of albuminous cells
What are Albuminous cells?
Albuminous cells are specialized parenchyma cells. They are found in association with the sieve tube cells of phloem in gymnosperm wood. It also contains albumen protein.
Does Albuminous cells have nucleus?
Sieve elements are the type of cell that are responsible for transporting sugars throughout the plant. At maturity they lack a nucleus and have very few organelles, so they rely on companion cells or albuminous cells for most of their metabolic needs.
What are Albuminous cells and sieve cells?
Hint: Albuminous cells are specialized parenchyma cells, associated with sieve cells in gymnosperms. Sieve cells have a close association with Albuminous cells which help in transporting organic material.
What is the main function of companion cells?
Companion cells function to load and unload sugars into the cavity of sieve tube members.
Which of the following has Albuminous cells?
Question : Spermatophytes in which phloem have albuminous cells and sieve cells
| Question | Spermatophytes in which phloem have albuminous cells and sieve cells |
|---|---|
| Type of Answer | Video & Image |
| Question Language | In Video – English In Text – English |
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Mar 12, 2022
Is Albuminous cells present in angiosperms?
In angiosperms, companion cell sieve tube cell of phloem function together to transport the food materials. Companion cells are absent in pteridophytes and gymnosperms. In conifers (gymnosperms), functional analogues of companion cells i.e. albuminous cells are present.
What is the role of companion cells in the translocation?
They provide energy to the sieve elements during food transport (translocation). A companion cell and the associated sieve element have an ontogenic relationship, which means that they arose from a common progenitor cell. The companion cell though is smaller and narrower than the sieve tube element.
Which features of companion cells are essential to their function?
Which features of companion cells are essential to their function? 1 They are connected by plasmadesmata to the sieve tube elements. 2 They have a thinner cell wall than a sieve tube element. 3 They contain a nucleus and mitochondria.
What is an Albuminous seed?
Albuminous seeds are endospermic seeds, endosperm persists in the mature seed and acts as a food storage tissue. Monocotyledonous seeds are mostly endospermic. Some examples of albuminous seeds are castor, maize, wheat, coconut, etc. Here, gram is an non albuminous seed. Castor and maize are albuminous seeds.
Do gymnosperms have Albuminous cells and sieve cells?
Explanation: Gymnosperms lack sieve tubes and companion cells. Gymnosperms have albuminous cells and sieve cells.
What is Strasburger cell?
Since their detection in 1891 by STRASBURGER, the albuminous cells or Strasburger cells of gymnosperms are believed to be analogous in function to the companion cells of angiosperm plants, although ontogenetically they are totally different cells.
Which one of the following is an Exalbuminous seed?
Wheat, castor, pea and groundnut are all the examples of ex-albuminous seeds.
What is the significance of knowing whether a seed is Albuminous or non Albuminous?
| Albuminous Seed | Non-Albuminous Seed |
|---|---|
| The seed which retains some part of endosperm not completely used up during embryo development. | The seed which does not retain any endosperm as it is completely used up during embryo development. |
| The examples are wheat, barley etc. | The examples are the pea, groundnut etc. |
What are Albuminous seeds give two examples?
Some exalbuminous seeds are bean, pea, oak, walnut, squash, sunflower, and radish. Seeds with an endosperm at maturity are termed albuminous seeds. Most monocots (e.g. grasses and palms) and many dicots (e.g. brazil nut and castor bean) have albuminous seeds. All gymnosperm seeds are albuminous.
What is the difference between Albuminous and Exalbuminous seeds?
In albuminous seeds, the endosperm tissue persists in the mature seed and is used up at the time of germination. In these seeds. the embryo is minute, whereas in exalbuminous seeds the endosperm is used up during embryo development and tie mature seed does not contain endosperm.
Why are Apomictic seeds useful for this purpose?
An advantage of apomixis is that it would drastically reduce the cost of hybrid production, so that plant breeders produce new varieties of seeds more quickly and more cheaply.
Where is food stored in Albuminous seeds?
endosperm
In albuminous seeds, food is stored in the endosperm so the cotyledons are small and thin compared to exalbuminous seeds.
What are the differences between Albuminous and Exalbuminous seeds in terms of food reserves?
The seeds that have not used endosperm completely for their nourishment are known as albuminous seeds while the exalbuminous seeds consume endosperm completely and food stored in the cotyledons.
What is the advantage of making hybrids into apomixis?
Apomixis would reduce the cost of hybrid production so that new varities of seeds are produced more quickly and at a cheaper rate. It reduces genetic diversity due to a lack of variations.
How apomictic seeds are beneficial to farmers?
Advantages to a farmer of using these apomictic seeds are as follows: (i) They reduce the cost of hybrid breeding programmes. (ii) Desirable traits can be maintained without losing the superiority of hybrids over parents (hybrid vigour), and farmers can replant these seeds year after year.
What will happen if apomictic gene is inserted into a hybrid?
Answer: Apomixis is an asexual mode of plant reproduction where seeds are produced without fertilisation. If these hybrid seeds are sown, it would results in the segregation of progeny in plants and also the hybrid characters will be lost.
What is fruit production without fertilization called?
Parthenocarpy refers to the development of fruit without fertilization.