What will come in place of (?), in the given expression.

Which is the following nutrient is responsible for the seed germination and flowering in plants?

Most expensive spice in the world is 

The coriander flower is:

In the context of rice physiology, which growth stage is most critical for water management and has the greatest influence on yield formation?

Which of the following is the non-physiological oxidant used by Robert Hill known as Hill reagent?

Full form of ICRISAT is 

The Downey mildew of Bajra is caused by

Which soil structure type is characterized by horizontal, plate-like aggregates?

What is the critical growth stage in wheat when moisture stress can cause maximum yield reduction due to impaired pollination and grain setting?

Which sedimentary rock is formed from compressed plant remains?