Green algae are considered as the ancestors of angiosperm. Justify this satatements.

Green algae are considered as the ancestors of angiosperms. Justify your answer.

The relationship between cattel egret and grazing cattel is considered as commensalism. Justify.

Placenta facilitates the supply of O_2 and nutrients to the embryo and removal of CO_2 and excretory waste products produced by the embryo. Apart from this, placenta is considered as an endocrine tissue. Justify.

Discovery, of Haber’s process for manufacture of ammonia is considered to be one of the principal discoveries of twentieth century. What is the temperature condition for maximum yield of ammonia? Justify.

"Heterocyst" the specialized thick-walled cells, are found in a. the lichens' b. the filamentous members of blue -green algae c. the members of fungi imperfect d. the members of green algae during adverse conditions of moistures