CBSE Class 12-science Biology Pollination

• 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  

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