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प्रश्न
Describe briefly how regeneration is carried out in multicellular organisms like Hydra.
उत्तर
When a hydra is bisected anywhere in the upper 7th or 8th part of the body column, the upper half will regenerate a foot at its basal end and the lower half will regenerate a head at its apical end; each half generates the organ which it is missing. The regeneration is precise, and the head and foot are always formed specifically at the apical and basal ends, respectively.
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संबंधित प्रश्न
Binary fission is a method of asexual reproduction.
Name the asexual method of reproduction in Hydra
Name two marine organisms which also reproduce by the same method as yeast but form colonies.
A scientist removed some cells from the growing point of a plant and placed it in a suitable medium leading to the formation of a shapeless lump of mass X. X is then transferred to another medium which stimulates it to develop roots. When X with developed roots is placed in a yet another medium, then it develops shoots to form tiny plantlets. These plantlets can then be transplanted in pots or soil where they can grow to form mature plants.
(a) What is the shapeless lump of mass X known as?
(b) What name is given to this method of producing new plants?
(c) The growth medium used in this method contains plant nutrients in the form of a 'jelly'. Name this jelly.
(d) What is the general name of chemicals used to stimulate the growth of plant cells and development of roots and shoots?
(e) Name any two plants which are produced by this method.
(f) State any two advantages of this method of producing plants.
(g) What is the other name of this method [other then that given in (b) above]?
Mention the common method of reproduction in Dahlia.
Mention the common method of reproduction in Gladiolus.
In which of the following figures is budding not shown?
(A) I
(B) II
(C) III
(D) IV
This method of asexual reproduction is seen in paramoecium.
Explain the importance of the reproduction process.
In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: Amoeba reproduced by fission.
Reason: All unicellular organisms are reproduced by the asexual method.
