When to neuter. A male dog can be neutered any time after eight weeks of age. A few years ago, most veterinarians advised waiting until puberty hit at about six months, and some still make that recommendation. Talk to your veterinarian about whatâs best for your dog.
The phylum Cycadophyta contains about 140 living species of plants called cycads, with more species present in the fossil record. Cycads have seeds and water-conducting vessels. Cycads belong to a larger group of plants called gymnosperms, which bear seeds in cone-like structures.
ADVERTISEMENTS: Gymnosperm is a large class that includes a number of fossils and living forms (Fig. 9.1). Various attempts have been made by different works to classify the gymnosperms. The classification as proposed by C.J. Chamberlain (1935) is as follows: Cycadales: (i) Cycadales include 11 living genera and more than 100 species of cycads. (ii) Cycads resembles with the pteridophytes.