Select the number from the given option that can replace

Which is the precursor of ethylene?

Botanical name of jowar is:

Which physiological disorder in cotton is caused by excessive nitrogen and results in vigorous vegetative growth but poor boll formation?

Which floral mechanism helps promote autogamy (self-pollination) in lettuce?

Two main components of sales promotion are ______.

Which soil-forming factor is classified as “active”?

The main host tree of Eri Silkworm is 

Saline soil having

(A) pH<8.5

(B) E.C.>4

(C) ESP<15

(D) Physical condition - Flocculated

Choose the correct answer from the options given below:

Which statement is true?

Cotton and pigeon pea are: