The plant hormone used to destroy weeds in a field
(4) 2, 4-D
As per NCERT, auxins are widely used as herbicides. 2, 4-D (2, 4-dichlorophenoxyacetic acid) is used to kill dicotyledonous weeds; it does not affect mature monocotyledonous plants.
IBA, IAA and NAA are used mainly for rooting, preventing fruit/leaf drop and parthenocarpy.
Answer: (4)
Which of the following is not an inhibitory substance governing seed dormancy?
Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop
What is the site of perception of photoperiod necessary for induction of flowering in plants?
It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?
Fruit and leaf drop at early stages can be prevented by the application of
You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?
Auxin can be bioassayed by