Home › ICAR JRF › Plant Sciences › Plant Reproduction › In the primrose, two flower forms differ in the …
In the primrose, two flower forms differ in the length of anthers and stigma. What is this called?
AApomixis
BHeterostyly
CDichogamy
DCleistogamy
Answer & Solution
Correct answer: B. Heterostyly
1. Plants have developed many physical barriers to self-pollination.
2. The primrose has evolved two flower types differing in anther and stigma length.
3. The pin-eyed form and the thrum-eyed form place these organs at different heights, and insects seeking nectar therefore cross-pollinate readily.
4. This phenomenon is known as heterostyly.
5. Apomixis is the production of seeds without fertilisation, which is a quite different route.
6. Other species separate the timing of pollen and ovary maturity instead, which is a barrier of time rather than of organ length.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 32 "Plant Reproduction", section 32.2 Pollination and Fertilization_
Related questions
A flower has been pollinated. What must still happen before a seed can form?What is the transfer of pollen from a stamen to a stigma called?In Bryophyllum and kalanchoe, new plants develop from which structure?What happens to the components of a leaf that a tree is about to shed?Which characteristic of senescence explains the yellowing of leaves?How long may the vegetative period last in some bamboo species before flowering?Bamboo and yucca flower only once in their lifetime. Such plants are called what?A carrot, which completes its life cycle in two seasons, is which kind of plant?