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प्रश्न
Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.
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उत्तर
Coelacanth was a fish was caught in South Africa in 1938, which was thought to be extinct. These animals were called lobefins which evolved into first amphibians that lived on both land and water. These are considered to be the ancestors of modern days frogs and salamanders.
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संबंधित प्रश्न
A flower of tomato plant following the process of sexual reproduction produces 200 viable seeds.
Answer the following questions giving reasons :
(a) What would have been the minimum number of ovules present in pre-pollinated pistil ?
(b) How many microscope mother cells would minimally be required to produce requisite number of pollen grains ?
(c) How many pollen grains must have minimally pollinated the carple ?
(d) How many male gametes would have used to produce these 200 viable seeds ?
(e) How many megaspore mother cells were required in this process ?
Give the floral adaptations for anemophily.
Describe the structure of its microsporangium.
Chief pollinators of agricultural crops are ______.
Anemophily type of pollination is found in ______.
Both chasmogamous and cleistogamous flowers are present in ______.
Plants with ovaries having only one or a few ovules are generally pollinated by ______.
During Hybridization process anther of the bisexual flower is removed before it dehisces is called ______.
In which one of the following pollination is autogamous?
Which one of the following flower is hypohydrophilous?
