The development of young embryos of pteridophytes within the female gametophytes is a precursor to the

Apical growth of the lower vascular plants takes place by an apical cell. This cell is generally pyramidal. Though four-sided in shape,it is often referred to as a three-sided cell because

The botanical name of Sanjeevani is:

Sporangia of eusporangiate ferns:

In $Dryopteris$,the opening mechanism of the sporangium is effectively operated by:

Ovules are absent in ...........