CBSE Class 12-science - Pollination Videos

• A phenomenon where a male insect mistakenly identified the patterns of a orchid flower as the as the female insect partner, and tries to copulate and thereby pollinates the flower is said to be  a. Pseudocopulation b. Pseudopollination c. Pseudoparthenocarpy d. Pseudofertilisation  
• State any one advantage and disadvantage of pollen grains to humans.
• what is callose
• why are night blooming flowers generally white in colour?
• where is sporopollenin present in plants? state its significance with reference to its chemical nature.
• Explain how self pollination is favoured in cleistogamous flower
• mention two strategies evolved to prevent self pollination?  
• Assertion :- In sun-flower family petals are modified in to pappus. Reason :- Pappus helps in dispersal of flower.
•   what is callose?is callose present around the generative nucleus in microspore?
• pollen grains are haploid k but y  

Queries asked on Sunday & after 7 pm from Monday to Saturday will be answered after 12 pm the next working day.