Flower
Flower: Overview
This topic covers concepts such as Gamopetalous Flower, Polypetalous Flower, Vexillary Aestivation, Perianth, Morphology of Flowering Plants, Flower, Thalamus of Flower, Bisexual Flower, Unisexual Flower, Symmetry of a Flower, etc.
Important Questions on Flower
Assertion: Plants lack excretory organs.
Reason: Plant usually absorbs essential nutrients and lead a passive life.
In the model of floral organ determination in Arabidopsis, the expression of class genes alone determines the development of sepals, expression of class genes along with class genes determines petal formation, expression of class genes along with class genes determines the formation of stamens and expression of class genes alone determines carpel formation. Loss of class gene function would result in flowers with whorls in the following order (from outer whorl to inner whorl)
Botanical names of plants are given in Column I, and the family/order name in Column II. Choose the appropriate combination from the options below.
| Column I | Column II | ||
| (P) | Tamarindus indica | (i) | Arecaceae |
| (Q) | Cocos nucifera | (ii) | Liliaceae |
| (R) | Colchicum autumnale | (iii) | Solanaceae |
| (S) | Withania somnifera | (iv) | Papilionaceae |
Which one of the following organisms is correctly matched with its three characteristics?
In Bentham and Hooker's system of classification, the sub-class Polypetalae and Gamopetalae have the cohorts in the ratio of
Assertion : An incomplete flower can be perfect.
Reason : Perfect flowers (incomplete) are called neuter.
Assertion : Persistent sepals of Physalis are called acrescent.
Reason: In Guava, the sepals are marcascent.
Assertion : In syngenesious stamen, the filaments are fused and the anther are free.
Reason : In synandrous stamen, both filaments and anthers are fused.
The condition where filaments and anthers are fused throughout the entire length is
Tetradynamous condition is related to
Hair present on the cob of corn are
Or
Long filamentous threads protruding at the end of a young cob of maize are
Basifixed monothecous anthers (OR) anthers with two microsporangia is characteristics of
Papilionaceous flower with large vexillum covering two wings and the wings covering the keel has corolla aestivation of
Examine the types of aestivation shown in the following diagram and select the correct answer
Bisexual flowers which never open, demonstrate
