Q27 of 30 Page 1

Name the type of interaction seen in each of the following examples:

(i) Ascaris worms living in the intestine of human.


(ii) Wasp pollinating fig inflorescence.


(iii) Clown fish living among the tentacles of se-anemone.


(iv) Mycorrhizae living on the roots higher plants.


(v) Orchid growing on a branch of a mango tree.


(vi) Disappearance of smaller barnacles when Balanus dominated in the Coast of Scotland.


i) The type of interaction between Ascaris worm and human intestine is

ii) The type of interaction between Wasp and fig inflorescence is Symbiotic as fig provides shelter and area for wasp to lay their eggs and in return wasp help in pollination of fig plant.


iii) The type of interaction between Clown Fish and Sea Anemone is Symbiotic as clown fish helps in cleaning and removal of residual food and also in protection and in return clown fish is protected from predators by the stinging cells of the sea anemone.


iv) The type of interaction between Mycorrhizae and roots of higher plants is Symbiotic as the fungus increases the water and nutrient absorption capability and the higher plant provides the fungus with carbohydrates made in the process of photosynthesis.


v) The type of interaction between orchid and a mango tree is Commensalism as the tree is not benefited by the orchid but the tree provides a place for orchid to grow on its branches.


vi) The type of interaction for the disappearance of smaller branches when balanus dominated the coast of Scotland is Competition.


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OR


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(a) Draw a labelled diagram of the human female reproductive system.

(b) Enumerate the events in the ovary of a human female during:


(i) Follicular phase


(ii) Luteal phase of menstrual cycle
OR


(a) Write the specific location and the functions of the following cells in human males:


(i) Leydig cells


(ii) Sertoli cells


(iii) Primary spermatocyte


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Explain the salient features of Hugo de Vries theory of mutation. How is Darwin’s theory of natural selection different from it? Explain.

OR


(a) Name the primates that lived about 15 million years ago. List their characteristic features.


(b) (i) Where was the first man-like animal found?


(ii) Write the order in which Neanderthals, Homo habilis and Homo erectus appeared on earth. State the brain capacity of each one of them.


(iii) When did modern Homo sapiens appear on this planet?