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Question 97.(i) Describe the endosperm development in coconut.(ii) Why is tender coconut considered as healthy source of nutrition?(iii) How are pea seeds different from castor seeds with respect to endosperm? (All India 2013)Answer:(i) Coconut endosperm formation is nuclear type.The primary endosperm nucleus undergoes free nuclear division without cell wall formation.(ii) Soft coconut is an endosperm. It is rich in nutrients like fats, proteins, carbohydrates, minerals, vitamins, etc. Hence, it is considered as a healthy source of nutrition.(iii) The seeds of pea are non-endospermic, while castor seeds are endospermic. The endosperm in pea seeds is consumed completely during embryo development, but endosperm is not utilised in castor seeds.

Question 98.(i) Describe the endosperm development in coconut.(ii) Why is tender coconut considered as healthy source of nutrition?(iii) How are pea seeds different from castor seeds with respect to endosperm? (All India 2013)Answer:(i) Coconut endosperm formation is nuclear type.The primary endosperm nucleus undergoes free nuclear division without cell wall formation.(ii) Soft coconut is an endosperm. It is rich in nutrients like fats, proteins, carbohydrates, minerals, vitamins, etc. Hence, it is considered as a healthy source of nutrition.(iii) The seeds of pea are non-endospermic, while castor seeds are endospermic. The endosperm in pea seeds is consumed completely during embryo development, but endosperm is not utilised in castor seeds.

Question 82.Cultivars of pineapple produce fruits with flowers that have a single carpel per flower. If the pineapple has 3 flowers, would it be as 'individual' as those having only 1 carpel? Explain. (Delhi 2015-16)Answer:Cultivars of pineapple produce flowers with'male' and 'female' parts which differentiate into three types. Male parts are free, i.e. separate from female parts. Thus, it can be said that the pineapple with 3 flowers is as 'individual' as those having only 1 carpel.

Question 18.What is the role of 'free-floating' pollen in fertilization? (Delhi 2016)Answer:Free-floating pollen is very important for fertilization as it brings the pollen and the stigma close together.

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