A newly hatched cuckoo bird is blind, but contact with an object beside it stimulates it to push the ...

A newly hatched cuckoo bird is blind, but contact with an object beside it stimulates it to push the object out of the nest. What term best describes this behavior?
 
  a. learned
  b. time sensitive learning
  c. imprinting
  d. instinct
  e. social landscape learning

Question 2

Grafting is used to grow all varieties of edible apples. What does grafting involve?
 
  a. repairing a damaged stem of a plant to continue its growth
  b. inducing polyploidy in plants
  c. growing new roots and shoots from extensions of a parent plant
  d. inducing a cutting from one plant to fuse with the tissues of another plant
  e. artificially inducing individual cells to divide and form an embryo