Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following are present in the caw of gymnosperms? (1) Naked ovules (2) Haploid endosperm (3) Double fertilisation (4) Absence of tracheidsA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
Gymnosperms are characterized by the presence of naked ovules borne unprotected on the surface of the megasporophylls. Development of endosperms takes place before fertilisation and hence, the endosperm is haploid. The xylem consists of only tracheids and xylem parenchyma. Vessels are absent (exception-Gnetales). There is a marked tendency for polyembryony and several embryos develop in a female gametophyte. Presence of leaf scars on the stem is a marked feature of gymnosperms.
You need to login to perform this action.
You will be redirected in
3 sec
