Examkin

Question

Difficulty: HardReproductive Systems and Processes in Organisms

An examination of a flower from an angiosperm species reveals reduced petals, long flexible filaments with versatile anthers, abundant light and smooth pollen grains, and feathery stigmas extending beyond the floral envelope. Which of the following correctly identifies the mode of pollination and the functional significance of these structural adaptations?

  1. Wind pollination, where feathery stigmas increase the surface area for capturing airborne pollen and smooth pollen facilitates buoyant atmospheric transport.Answer
  2. B
    Insect pollination, where feathery stigmas function to brush sticky pollen grains off the body surfaces of visiting pollinators.
  3. C
    Water pollination, where feathery stigmas act as submerged filter nets to trap pollen floating through aquatic currents.
  4. D
    Self-pollination, where versatile anthers and feathery stigmas ensure direct contact between pollen and ovules within the same closed flower.

Answer

Wind pollination, where feathery stigmas increase the surface area for capturing airborne pollen and smooth pollen facilitates buoyant atmospheric transport.
Wind-pollinated (anemophilous) flowers exhibit structural adaptations designed to maximize airborne pollen movement and capture. Feathery stigmas hang outside the flower to expand the catchment area for floating pollen, while light and smooth pollen grains reduce drag and prevent premature clumping. Reduced petals eliminate obstacles to wind currents.

Step-by-Step Solution

1
Analyze the observed structural features of the flower stem
Features identified: reduced petals, feathery stigmas, exposed versatile anthers, and abundant light, smooth pollen grains.
These characteristics indicate an evolutionary adaptation for passive movement via air currents rather than animal attraction.
2
Correlate floral structures with the mechanism of pollination
Feathery stigmas maximize surface area to intercept floating pollen grains, while smooth, light pollen prevents clumping during wind transport.
Anemophilous flowers evolve structures specifically adapted for airborne dispersal and efficient pollen interception.
3
Evaluate the option choices to identify the correct pairing
The statement attributing these adaptations to wind pollination is correct.
Entomophilous, hydrophilous, and autogamous flowers exhibit distinct structural profiles inconsistent with exposed feathery stigmas and light, smooth pollen.

Key Concept

Floral Adaptations for Wind Pollination (Anemophily)
Rate this question

Topics

Reproductive Systems and Processes in Organisms

More questions from this topic