What is the minimum number of vectors of unequal magnitude required to produce a zero resultant?

What is the magnitude of a unit vector ?

The minimum number of components required for an ecosystem to survive are,

A vector with magnitude zero is called a

What is the minimum number of ordered paris to form a non-zero reflexive relation on a set of n elements?

What is the physical meaning of zero vector?

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds. Answer the following questions giving reasons: (a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil? (b) What would have been the minimum number of ovules present in the ovary? (c) How many megaspore mother cells were involved? (d) What is the minimum number of microspore mother cells involved in the above case? (e) How many male gametes were involved in this case?