NEET · Biology · Sexual Reproduction in Flowering Plants doubts
10 doubts found
Why are so many flowers brightly coloured, scented and full of nectar?
These flowers rely on animals — insects, birds or bats — to carry pollen from one plant to another (cross-pollination).
What is 'double fertilisation', and why is it special to flowering plants?
A pollen grain delivers two male gametes into the embryo sac.
How can bananas and some grapes be seedless if seeds come from fertilisation?
These fruits form by parthenocarpy — fruit development WITHOUT fertilisation.
Why do wind-pollinated plants (like grasses) release so much pollen, and why does it trigger allergies?
Wind is a random, wasteful carrier — most pollen never lands on the right stigma — so these plants compensate by producing enormous quantities of very light, dry pollen that drifts far on the breeze.
What does “Pollination” actually mean in Sexual Reproduction in Flowering Plants, and why does it matter for NEET?
the transfer of pollen from anther to stigma; it may be self-pollination (same flower/plant) or cross-pollination (different plant).
I keep getting “Pollination” questions wrong in Sexual Reproduction in Flowering Plants. What's the trap?
confusing pollination (pollen transfer) with fertilisation (gamete fusion).
What does “Double fertilisation” actually mean in Sexual Reproduction in Flowering Plants, and why does it matter for NEET?
unique to flowering plants — one male gamete fuses with the egg (forming the zygote) and the other with the polar nuclei (forming the nutritive endosperm).
I keep getting “Double fertilisation” questions wrong in Sexual Reproduction in Flowering Plants. What's the trap?
thinking only one fusion happens, as in animals.
What is the difference between self-pollination and cross-pollination?
Self-pollination keeps traits pure but gives no variation; cross-pollination mixes genes from two plants, creating variation that helps a species adapt.
What is the difference between insect-pollinated flower and wind-pollinated flower?
Insect-pollinated flowers are large, colourful, scented and have sticky pollen; wind-pollinated flowers are small and dull with huge amounts of light, dry pollen.