alleryStart learning →In double fertilisation, what do the two sperm cells produce?
AA diploid zygote and a triploid endosperm
BA triploid zygote and a diploid endosperm
CA diploid zygote and a diploid endosperm
DA triploid zygote and a triploid endosperm
Answer & Solution
Correct answer: A. A diploid zygote and a triploid endosperm
1. The pollen tube is guided by chemicals secreted by the synergids and enters the ovule sac through the micropyle.
2. One sperm fertilises the egg cell, forming a diploid zygote.
3. The other sperm fuses with the two polar nuclei, forming a triploid cell that develops into the endosperm.
4. Both events together are known as double fertilisation, and after they are complete no other sperm can enter.
5. The endosperm must be triploid because it comes from one sperm plus two nuclei, so any option making it diploid miscounts.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 32 "Plant Reproduction", section 32.2 Pollination and Fertilization_
Keep practising Plant Reproduction
Browse all Plant Reproduction questions for ICAR JRF, or explore more Plant Sciences topics.
Related questions
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?In plant tissue culture, the undifferentiated mass from which plantlets later grow is callWhich propagation method bends a stem that is still attached to the parent and covers it w