1. Tardigrade
  2. Question
  3. Biology
  4. Identify the characters with reference to the plant in which eight nucleated embryo sac was first studied by Strasburger. I - Micropyle, chalaza and funiculus are arranged in the same vertical line in the ovule. II - Presence of both unisexual and bisexual flowers in the same plant. III - Filiform apparatus helps in conduction of food materials from endosperm to egg apparatus. IV - Long funiculus coils like a watch spring around the ovule.

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Q. Identify the characters with reference to the plant in which eight nucleated embryo sac was first studied by Strasburger.
I - Micropyle, chalaza and funiculus are arranged in the same vertical line in the ovule.
II - Presence of both unisexual and bisexual flowers in the same plant.
III - Filiform apparatus helps in conduction of food materials from endosperm to egg apparatus.
IV - Long funiculus coils like a watch spring around the ovule.

NTA AbhyasNTA Abhyas 2020Sexual Reproduction in Flowering Plants

Solution:

Strasburger (1879) first time described Polygonum type of embryo sac on Polygonum divaricum. Orthotropous ovule is found in Polygonum. It is the simplest and primitive type, in which micropyle, chalaza and funiculus lie in one vertical plane.
Monosporic embryo sac : Only one megaspore nucleus forms embryo sac e.g., Polygonum, Oenothera.