Ques. 1AIPMT 2002
Which of the following is without exception in angiosperms?
- Presence of vessels
- Double fertilisation
- Secondary growth
- Autotrophic nutrition
Answer
(2) Double fertilisation
Solution
As per NCERT, double fertilisation (syngamy + triple fusion) is an event unique to flowering plants and occurs in all angiosperms.
The other features have exceptions: vessels are absent in some angiosperms (e.g. Wintera, Trochodendron), secondary growth is generally absent in monocots, and some angiosperms are not autotrophic, e.g. Cuscuta (parasite) and Monotropa (saprophyte).
∴ Double fertilisation is the feature present without exception in angiosperms.
Answer: (2)