52.
Which of the following botanists provided the first scientific proof that sap from a diseased plant could induce the mosaic disease in healthy tobacco plants?

53.
Consider the following statements.
1. Fragmentation is the common method of reproduction in algae, fungi and lichens.
2. Organisms which reproduce by fission are yeast and bacteria.
3. Reproduction by budding occurs in yeasts.
Which of the statements given above are correct about asexual reproduction methods?

56.
Match List-I (Vegetative Propagation Type) with List-II (Example) and select the correct answer:
List-I List-II
a. Tuber eye 1. Garlic
b. Bulb 2. Rose
c. Cutting 3. Potato
d. Plantiels at margins of leaves 4. Bryophyllum

57.
Bitter-pit disease of apples is caused by

58.
Consider the following statements.
1. Translocation of food occurs through phloem.
2. Translocation via phloem occurs in the form of sucrose.
3. Loss of bark or girdling harms the plant more than loss of leaves, as root starves due to stoppage of food conduction.
Which of the statements given above is/are correct about translocation of food?

59.
In which kind of ovule, nucellar tissue intervenes between the micropyle and the embryo sac and must be penetrated by the pollen tube?

60.
The kind of association where both the population are benefited, but not essential for the survival of either population is referred to as