Which of the following statements is not correct?
(1) Insects that consume pollen or nectar without bringing about pollination are called pollen nectar robbers
(2) Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil
(3) Some reptiles have also been reported as pollinators in some plant species
(4) Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style
The pollen tube usually enters the embryo sac
(1) through one of the synergids
(2) by directly penetrating the egg
(3) between one synergid and central cell
(4) by knocking off the antipodal cells
Which of the following options is correct?
| 1. | Pollination gives the guarantee of the promotion of post-pollination events that lead to fertilization |
| 2. | The events – “from pollen deposition on stigma until pollen tubes enter the ovule" are together referred to as pollen-pistil interaction |
| 3. | Pollen-pistil interaction is a dynamic process involving pollen recognition followed by only promotion (not rejection) of the pollen |
| 4. | Pistil has no ability to recognize the pollen, whether right or wrong type |
Pollen tube, after reaching the ovary, does not show following event:
(1) Enters the ovule through the micropyle
(2) May enter the ovule through chalaza
(3) Enters one of the synergid through filiform apparatus
(4) Chemotactic movement of pollen tube towards synergid
The plant parts which consist of two generations, one within the other, are:
| a. | Pollen grains inside the anther |
| b. | Germinated pollen grain with two male gametes |
| c. | Seed inside the fruit |
| d. | Embryo sac inside the ovule |
1. (a), (b), and (c)
2. (c) and (d)
3. (a) and (d)
4. (a) only
What will be the ploidy of endosperm of a seed produced after crossing tetraploid female plant with tetraploid male plant?
1. Pentaploid
2. Hexaploid
3. Diploid
4. Triploid
(a) the female flower buds of plant producing unisexual flower need not be bagged.
(b) there is no need to emasculate unisexual flowers of selected female parent
(c) emasculated flowers are to be bagged immediately after cross pollination
(d) emasculated flowers are to be bagged after removal of anthers
(e) bisexual flowers, showing protogyny are never selected for cross
Choose the correct answer from the options given below :
| 1. | (a), (b) and (c) only | 2. | (b), (c) and (d) only |
| 3. | (b), (c) and (e) only | 4. | (a), (d) and (e) only |
| A: | Castor and maize plant can prevent both autogamy and geitonogamy. |
| B: | Orchid fruit contains thousands of tiny seeds. |
1. Only statement A is incorrect
2. Only statement B is incorrect
3. Both statements A and B are correct
4. Both statements A and B are incorrect
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