NCERT Important Questions Class 9 Science biology Chapter 15
Important NCERT Extra Questions
Chapter 15 Improvement in Food Resources
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
Define the terms hybridization and photoperiod.
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Hybridisation. It is crossing of two (or more) types of individuals with different useful traits in order to bring them together in the progeny.
Photoperiod. light is duration of day light that influences plants and other organisms in their growth, reproduction and maturation