Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Sumit Maurya 8 years, 2 months ago
- 0 answers
Posted by Wangshol Salem 8 years, 2 months ago
- 1 answers
Bhawna Saini 8 years, 2 months ago
Posted by Arsh Manav 8 years, 2 months ago
- 1 answers
Bhawna Saini 8 years, 2 months ago
Posted by Ritik Sharma 8 years, 2 months ago
- 0 answers
Posted by Shambhu Kumar 8 years, 2 months ago
- 0 answers
Posted by Neha Vishwakarma 8 years, 2 months ago
- 0 answers
Posted by Amrita Kumari 8 years, 2 months ago
- 0 answers
Posted by Prem Singh 8 years, 2 months ago
- 0 answers
Posted by King Panwar 8 years, 2 months ago
- 1 answers
Bhawna Saini 8 years, 2 months ago
Posted by Ruhii Yadav 8 years, 2 months ago
- 0 answers
Posted by Dhiraj Sardar 8 years, 2 months ago
- 0 answers
Posted by Vansh Sharma 8 years, 2 months ago
- 0 answers
Posted by Vansh Sharma 8 years, 2 months ago
- 2 answers
Squeaky Pathak 8 years, 2 months ago
Posted by Monalisa Behera 8 years, 2 months ago
- 1 answers
Aadarsh Chauhan 8 years, 2 months ago
Posted by Tanu Gorain 8 years, 2 months ago
- 1 answers
Posted by Amit Kumar 8 years, 2 months ago
- 0 answers
Posted by Palak Narayan 8 years, 2 months ago
- 1 answers
Amar Kumar 8 years, 2 months ago
Apomixis: It is derived from two Greek words APO (away from) and mixed ( the act of mixing or mingling). It refers to the occurrence of an asexual reproductive process in the place of normal sexual processes involving reduction division and fertilization.
Types of Apomixis:- Three types of apomixis are generally recognized – diplospory, apospory and adventitious embryony. These apomictic processes are depicted compared to sexual processes in the formation of a common Polygonum-type embryo sac.
- Diplospory: In diplospory, the unreduced embryo sac is derived from the megaspore mother cell either directly by mitotic division or by aborted meiotic events. Three major types of diplospory have been reported, named after the plants in which they occur, and they are the Taraxacum, Ixeris and Antennaria types.
- Apospory :In apospory, the nuclear cells that give rise to the apomictic embryo sac, termed aposporos initials, are distinct from the ameiotic megasporocyte. They are similar in appearance to the ameiotic megasporocyte and may differentiate close to the ameiotic megasporocyte and develop into an apomictic embryo sac.
- Adventitious Embryony: In this process, embryos initiate parthenogenetically outside of an embryo sac structure. Adventitious embryony is most commonly initiated later in ovule development from nucellar and integumentary tissues.
In general, fertilization in the adjoining sexual embryo sac and subsequent endosperm formation is necessary to form viable seeds. The developing embryos closest to the embryo sac grow towards it, presumably to obtain nutrient and other developmental signals from the embryo sac.
Posted by Parveen Masih 8 years, 2 months ago
- 0 answers
Posted by Anchal Sharma 8 years, 2 months ago
- 0 answers
Posted by Bhawna Saini 8 years, 2 months ago
- 1 answers
Posted by Priyanka Suryawanshi 8 years, 2 months ago
- 0 answers
Posted by Pankaj Jaroliya 8 years, 2 months ago
- 1 answers
Priyanka Shinde 8 years, 2 months ago
Posted by Dibya Dipta 8 years, 2 months ago
- 1 answers
Posted by Bio Tech 8 years, 2 months ago
- 1 answers
Ahtesham Rajput 8 years, 2 months ago
Posted by Diya Joshi 8 years, 2 months ago
- 0 answers
Posted by Squeaky Pathak 8 years, 2 months ago
- 0 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Abhishek Tripathi 8 years, 2 months ago
0Thank You