The endosperm is produced from the primary endosperm nucleus, which is produced by triple fusion as the second male gamete fuses with the two... View Article
Cleistogamous flowers show autogamy as they do not open. Anthers are present close to the stigma and receive pollen grains as anthers dehisce.... View Article
The viability of pollen grains varies from species to species. Pollen grains of cereals such as wheat, rice, etc. show viability only for 30... View Article
Microspore tetrad is formed by meiosis in the pollen mother cells. If the plant is diploid then the cells of microspore tetrad will be haploid.... View Article
The two reproductive parts of a flower are the androecium and gynoecium. The androecium is the male reproductive part, which is represented by... View Article
Sepals form the outermost whorl of the flower known as calyx. They are generally green in colour. Normally sepals fall off after fertilisation.... View Article
A) pentaploidy B) tetraploidy C) triploidy D) diploidy Answer:B) tetraploidy Explanation: Primary endosperm nucleus is formed by the fusion of... View Article
A) Egg nucleus and secondary nucleus B) Nucellus and antipodal cells C) Egg cell and antipodal cells D) Megaspore mother cell and antipodal... View Article
A) small, producing a large number of dry pollen grains B) small, brightly coloured, producing a large number of pollen grains C) small,... View Article
A) lilies B) legumes C) orchids D) grasses Answer:D) grasses Explanation: Wind pollination is also called anemophily. It is common in grasses.... View Article
A) flower buds B) root buds C) axillary buds D) shoot buds Answer:Â C) axillary buds Explanation: Potato is a stem tuber. The eyes of a... View Article
A) Xenogamy B) Geitonogamy C) Cleistogamy D) Chasmogamy Answer:C) Cleistogamy Explanation: Autogamy refers to the transfer of pollen within the... View Article
A) Gossypium B) Citrus C) Brassica D) Triticum Answer:B) Citrus Explanation: Polyembryony is a condition, where there are more than one embryos... View Article
A) butterflies B) bees C) wind D) birds Answer:C) wind Explanation: Wind-pollinated flowers often show a single ovule in the ovary and many... View Article
A) Vegetative cell is larger than generative cell B) When pollen is shed at the two-Âcelled stage, double fertilization does not take place C)... View Article
A) sporopollenin B) cuticle C) cellulose D) lignin Answer:A) sporopollenin Explanation: Sporopollenin is the most resistant organic compound... View Article
A) cucumber B) papaya C) maize D) castor Answer:B) papaya Explanation: Autogamy refers to the transfer of pollen from anther to the stigma of... View Article