question_answer 115)

  Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyze the reasons for failure of fruit formation in rose.

Answer:

                  Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. The reasons for failure of fruit formation in rose are as follows (i) Rose plants may not produce viable pollens, hence, no fertilization can take place. (ii) Rose plants may not have functional eggs. (iii) Rose plants may have defective and non-functional ovule .which is the female gametophyte generator. (iv) There may be self-incompatibility. (v) There may be internal barriers for pollen tube growth or fertilization. (vi) As rose plants are hybrids and reproduce vegetatively, there are chances for them to be sterile.