What is the focal length of a plane

The oldest crop improvement method is:

Anaerobic respiration is called as

Short day plant is:

Dioecious form of sex is found in which Fruit Crop :

Deforestation has an alarming effect

Which of the following scientists is credited with developing the first cotton hybrid in India, which significantly boosted cotton productivity?

Which  among the following  can be considered as a biofertilizer?

The optimum spacing (row × plant) of hybrid cotton grown in the irrigated areas

Accumulation of sodium on soil exchange sites is termed:

Iron is absorbed by plants in which of the following forms?

(a)  Fe²⁺

(b)  Fe⁴⁺

(c)  Fe

(d)  Fe³⁺