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Which of the following is without exception in angiosperms?
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- presence of vessels
- double fertilisation
- secondary growth
- autotrophic nutrition
Correct Option: B
Vesselless angiosperms are Wintera, Trochodendron etc. Secondary growth is absent in some angiosperms. Angiospermic plants are autotrophic in nutrition. But some angiosperms are heterotrophic in nutrition. The 4 special modes of nutrition and their examples include :
(i) Saprophytic: e.g. Neottia, Monotropa.
(ii) Symbiotic – e.g. Mycorrhiza-between fungus and roots of higher plants.
(iii) Parasitic – Cuscuta.
(iv) Insectivorous plant – Nepenthes.
Double fertilization is characteristic of all angiosperms.