62.
Which of the following organisms, in 1943, caused the 'Bengal famine' in which several lacs of people died of starvation?

67.
The efficiency of energy conversion in plants is equal to

68.
According to Blackman (1928), the carbon conservation by oxygen in the Pasteur effect was due to some synthetic reaction termed

69.
The phenomenon in which different plant parts like stem, fruit-stalks, valves of fruits, bracts etc, are closely curled towards one another when dry but open apart when moistened is known as

70.
In which of the following plants the synergids become egg like and may be fertilized by sperms from an additional pollen tube?