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Question

Complex tissues are not found in
  1. All spermatophytes
  2. All gametophytes
  3. Pteridophytes
  4. Few bryophytes

A
Few bryophytes
B
Pteridophytes
C
All spermatophytes
D
All gametophytes
Solution
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Tissues which are made up of more than one type of cells and they work together as a unit are termed as complex tissues; it includes xylem and phloem. Bryophytes are a group of simple and primitive plants that show alteration of generation between two distinct phases namely a haploid gametophytic and a diploid sporophytic phase. The gametophyte is the haploid plant body which is either thalloid or a leafy shoot with stem-like and leaf-like structures and thread-like rhizoids. It lacks vascular tissues xylem and phloem. Zygote represents the first cell of the sporophytic phase which divides and develops into sporogonium. Sporogonium is differentiated into a foot, a seta and a capsule and serve to produce spores. Thus, all bryophytes lack complex tissues.
All gametophytes are the simple haploid stage that develops from spore and lacks vascular tissues, thus no complex tissues. Pteridophytes are the first vascular plants and possess vascular tissues xylem and phloem. The main plant body is sporophyte which is differentiated into true root, stem and leaves having a well differentiated vascular tissue.
The spermatophytes are the seed plants and include gymnosperms and angiosperms both of which have well developed vascular tissues (xylem and phloem).
Thus, the correct answer is option C.

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