Short Answer TypeHow many chromosomes do drones of honeybee possess? Name the type of cell division involved in the production of sperms by them.
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
(a) Select the homologous structures from the combinations given below :
(i) Forelimbs of whales and bats
(ii) Tuber of potato and sweet potato
(iii) Eyes of octopus and mammals
(iv) Thorns of Bougainvillea and tendrils of Cucurbita
(b) State the kind of evolution they represent.
(a) Why are the plants raised through micro-propagation termed as somaclones?
(b) Mention two advantages of this technique.
(a) The plants raised through micropropagation are called somaclones because they are genetically identical to the original plant from which they were grown.
(b) The advantages of micro-propagation are as follows:
(i) It helps in the propagation of a large number of plants in a short span of time.
(ii) It helps in recovery of healthy plants from diseased ones. It helps in producing plants that are disease and pest resistant.
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