Table of Contents
What are the features of cross-pollination?
Cross-pollination is always dependant on another agent to cause the transfer of pollen. The agents of pollination include birds, animals, water, wind, and insects. Based on the agent of pollination, cross-pollination can be of different types: Hydrophilous Flowers-These flowers are pollinated by water means.
What are the factors that affect cross-pollination?
Thus was born this special issue, highlighting various important challenges pollinators face.
- Stress from Pathogen. The paper by S. L. Bushmann et al.
- Stress from Transportation. There are specific stressors only experienced by managed pollinators.
- Stress from Climate Change.
- Plant-Pollinator Interactions.
- Invasive Species.
What is the best adaptation for cross-pollination?
Adaptations for Cross-Pollination:
- Uni-Sexuality of Flowers: In plants bearing unisexual flowers self-pollination is practically out of question and cross- pollination is inevitable.
- Self-Sterility: In some plants pollen grains have no effect and arc.
- Dichogamy:
- Heterostyly:
- Heikogamy:
What ensures cross-pollination in plants?
Wind. Plants that use wind for cross-pollination generally have flowers that appear early in the spring, before or as the plant’s leaves are emerging. This prevents the leaves from interfering with the dispersal of the pollen from the anthers and provides for the reception of the pollen on the stigmas of the flowers.
How is cross-fertilization promoted?
In higher plants, cross-fertilization is achieved via cross-pollination, when pollen grains (which give rise to sperm) are transferred from the cones or flowers of one plant to egg-bearing cones or flowers of another.
Which incompatibility promotes cross-pollination?
Self-incompatibility in
Self-incompatibility in plants is an adaptation which promotes cross pollination.
Which of the following character causes cross-pollination?
EXPLANATION: In diclinous plants cross-pollination can be found. These plants hold unisexual flowers. Pollination of cleistogamous flowers is called cleistogamy. The presence of both flower types allows mixed breeding system species to the process of cross-pollination.
How do you ensure cross-pollination?
With wind or insect pollinated plants, the plants need pollination from flowers on other plants (either the same or different varieties) to produce healthy seeds. To prevent cross pollination, you would need to plant different varieties 100 yards (91 m.) or more apart. This is normally not possible in the home garden.
Which one of the following conditions Favour cross-pollination?
The factors which favour cross pollination are unisexuality, dichogamy, self sterility, mechanical and structural barrier and heterostyly. 1.
What features do flowers have to attract pollinators?
Many flowers use visual cues to attract pollinators: showy petals and sepals, nectar guides, shape, size, and color. Members of the lily family such as the trout lily have very showy sepals and petals that are indistinguishable and are technically called tepals.
Which of these encourage cross-pollination?
Dichogamy promotes cross pollination even in the hermaphrodite species. Dichogamy is of two types: viz. i) protogyny and ii) protandry.
Which part of the flower attracts insects and helps in cross pollination?
The top of the pistil is called the stigma, and is often sticky. Seeds are made at the base of the pistil, in the ovule. To be pollinated, pollen must be moved from a stamen to the stigma.
How do flowers encourage pollination?
Plants attract pollinators in various ways, by offering pollen or nectar meals and by guiding them to the flower using scent and visual cues. This has resulted in strong relationships between plants and the animals that pollinate them.
What are the two features of flowers which Favour pollination by insects?
The two features which favour pollination by insects are – The bright colour of petals to attract insects. Nectar to attract insects.
- The bright colour of petals to attract insects.
- Nectar to attract insects.
Which of the following strategies are used for cross-pollination?
A genetic mechanism called self-incompatibility, which prevents self-pollen from fertilising the ovules either by inhibiting pollen germination or by retarding the growth of pollen tube in the pistil. By producing unisexual flowers.
Which of the following features are possessed by the flower pollinated by flies?
Option (B)- Bright petals, rough sticky pollen is correct for insect-pollinated flowers because they are brightly colored and have large and sticky pollen grains with spikes.
What are the unique features of flowers that are pollinated by wind and insects?
The wind-pollinated flowers comprise light coloured petals, without a pleasant strong smell. The insect-pollinated flowers comprise brightly coloured petals with a pleasant strong smell. In wind-pollinated flowers, the produced pollen grains are smaller and lighter in weight, which can be carried by the wind easily.
What features of flowers facilitate pollination by insects?
Features of insect-pollinated flower:
- Flowers are brightly coloured, scented and secrete nectar.
- Pollen grains are larger, sticky and spiny.
- Pollen grains are fewer in number as they are transported mechanically by insects.
- The stigma of flowers is small and deep within the corolla.
What are the features of the flowers of plants that are wind-pollinated?
Wind-pollinated flowers are typically:
- No bright colors, special odors, or nectar.
- Small.
- Most have no petals.
- Stamens and stigmas exposed to air currents.
- Large amount of pollen.
- Pollen smooth, light, easily airborne.
- Stigma feathery to catch pollen from wind.
What are features of a plant that is pollinated by wind?
Anemophilous, or wind pollinated flowers, are usually small and inconspicuous, and do not possess a scent or produce nectar. The anthers may produce a large number of pollen grains, while the stamens are generally long and protrude out of flower.