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What do male cones produce?
Male cones produce many pollen grains to enhance its reproductive rate & hence its evolutionary success
What is advantages of a plant producing so much pollen?
Pollen protects the gametes from environmental dangers and allows the gametes to travel without water. This in turn allows the gametes to travel longer distances and to more diverse environments
What very low temperature can plants survive at?
Most plants can survive temperatures as low as 32°F (0°C). However, some plants are adapted to survive even lower temperatures, such as certain conifers that can withstand temperatures below 0°F (-18°C).
How do plants get pollinated even though they can't move?
The wind carries pollen from plant to plant, and insects such as bees and hummingbirds collect and transfer it while feeding on the nectar.
What are the agents in pollination?
Agents of PollinationIntroduction of agents of pollinationWhen the pollen grains are shed from anther, they are disseminated by arios agencies. Some of them may, by one means or another, finally reached the stigma of a pistil, either of same or another flower. This transfer of pollen from anther to stigma is called pollination. Agents of pollination are wind, water, insects, birds and bats. Description of Agents of PollinationWind (anemophily): Wind is one of the most important agents of pollination. Pollination brought about through agency of wind in plants is called anemophily. Wind pollinated plants are coconut palm, date palm, cannabis, maize, grasses etc. exhibit the following characters which favour the wind pollination.a) Wind pollinated flowers are inconspicuous and not showy.b) They are devoid of scent, nectar etc.c) The pollen grains are dry and unwettable.d) The anemophilous plants grow in large groups to ensure pollination.e) To catch the pollen grains, the stigma become sticky, hairy, and feathery or branched.2. Water (Hydrophily): Pollination brought about through the agency of water in plants especially submerged plants is termed hydrophily. Examples are Hydrilla, Ceratophyllum, Zostera and Vallisneria are some of the water pollinated plants.3. Insects(Entomophily): Inset pollinated flowers possess following characteristic featuresa) The insect pollinated flowers are fragrant and omit sent and odour. Example Cestrum, Jasmine etc. Rafflesia gives out obnoxious and repelling odour.b) The insect pollinated flowers are beautifully coloured. In flowers, mostly petals are brightly coloured.c) The nectariferous glands produce nectar for feeding the visiting insects.d) To catch the pollen grains, the stigmas become sticky.4. Birds (ornithophily): Ornithophilous flowers differ in number of respects from entomophilous flowers. These kind of flowers are generally scentless. The flowers are usually large in size. They are also beautifully coloured with colour contrasts and are common colours liked by birds.5. Bats (Chiropterophily): The flowers of Kigella pinnata, Durio, Antocephalus are pollinated by bats. The bats hold on to the freely exposed, large and relatively tough flowers, which open in the evening or night. Bats are nocturnal animals and transport pollen over long distances. They usually give off a strong scent like that of rotting fruits. Bats also feed on the copious nectar and pollen which is produced in plenty as compared bird pollinated flowers.
Are pollen grains formed within the stigma?
No, pollen grains are not formed within the stigma. Pollen grains are formed in the anthers of a flower's stamen. The stigma is part of the female reproductive structure of a flower, where pollen grains land and germinate to fertilize the ovules.
What do male cones produce?
Male cones produce many pollen grains to enhance its reproductive rate & hence its evolutionary success
What is the difference between a spore and a pollen grain?
Pollen grains are formed in the anthers by meiosis; seeds in the ovary by fertilizationPollen grains are very tiny, even microscopic; seeds may be as small as 1mm across to as large as 50cmPollen grains are a single cell (similar to sperm); seeds are multicellularIts function is to carry the male characteristics of the plant to fertilize the egg cell; seeds are there to develop into a new plant when the conditions are favourable
What are the characteristics of self pollinated plants?
•Large,colourful petals. •scented •nectaries are present •small, sticky stigma •stamens are enclosed within the flower •anthers are fused to their bases or along their backs to the filaments •produces less pollen Pollen grains are heavy, sticky and large •complex flower structure.
What is advantages of a plant producing so much pollen?
Pollen protects the gametes from environmental dangers and allows the gametes to travel without water. This in turn allows the gametes to travel longer distances and to more diverse environments
Are wind pollinated flowers petals small?
Yes, wind pollinated flower petals are small, because they do not need to be showy to attract insects.
What does a pollen grain look like?
The pollen for each kind of tree or flower is distinctive to that species, so there is no definite description for what pollen in general looks like - the grains aren't even all round; the size also varies: for instance, a grain of pollen from an elm tree (which is round) is about 20 micrometers in diameter, whereas a pollen grain from a Scots pine tree is kinda kidney shaped, & measures about 40 x 60 micrometers
What very low temperature can plants survive at?
Most plants can survive temperatures as low as 32°F (0°C). However, some plants are adapted to survive even lower temperatures, such as certain conifers that can withstand temperatures below 0°F (-18°C).
Are desert rats carnivores?
Rats are omnivores and will eat almost anything from plants, grains, small animals, insects and even carrion.
Do bats have hearts?
Of corse they do. Evrey creature needs a heart to survive and live in this world. Even plants have hearts.
How do plants get pollinated even though they can't move?
The wind carries pollen from plant to plant, and insects such as bees and hummingbirds collect and transfer it while feeding on the nectar.
What allows people and animals to survive on Earth?
Water allows people and animals to survive. With out water, all life on Earth would die. Even plants could not live.
