Pollen Pistil Interaction

Q.

Briefly explain the structure of pollen grains.

Q. Pollen-pistil interaction refers to all the events starting from

1. pollen deposition on the stigma until pollen tube enters the ovule.
2. pollen deposition on stigma until the germination of pollen grains.
3. pollen deposition on the stigma until the growth of pollen tube starts.
4. pollen deposition on the stigma until male gamete fuses with the egg cell.

Q.

Mention the peculiar features of the following

1) Anemophilous flower

2)Hydrophilous flower

Q.

Name an event that is unique to angiosperms?

Q.

How many cells are present in the pollen grains at the time of their release from anther? Name the cells. [2]

Q.

In some plants, the anthers and stigma grow and mature at the same time. This phenomenon is called

1. Allogamy

2. Fusion

3. Homogamy

4. Syngamy

Q. Fertilization in angiosperms was discovered by

1. Hofmeister
2. Strasburger
3. Nawaschin
4. Amici

Q. Point the odd one out

1. Nucellus
2. Embryo sac
3. Pollen grain
4. Micropyle

Q. All the events from pollen deposition on stigma until pollen tube enters the ovule are collectively known as:

1. 
   Fertilisation
2. 
   Pollination
3. 
   Pollen–pistil interaction
4. 
   Triple fertilisation

Q. A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by

1. Water
2. Insects
3. Animals
4. Wind

Q.

Cell/ cells present in a mature pollen grain is/are

1. Vegetative cell

2. Generative cell

3. Both A and B

4. Antipodal cells

Q. The generative cell of a pollen grain was destroyed by laser but a normal pollen tube was still formed because

1. vegetative cell is not damaged
2. contents of killed generative cell stimulate pollen growth
3. laser beam stimulates growth of pollen tube
4. the region of emergence of pollen tube is not harmed.

Q.

Is it possible to store pollen grains?

Q. Which one of the following is not a case of incomplete dominance?

1. Flower colour of Camellia
2. Flower colour of snapdragon
3. Flower colour in Mirabilis jalapa
4. Fruit colour of eggplant (brinjal)

Q.

Pollen Grains Can Be Stored For Several Years

1. True
2. False

Q. Which of the following statements are incorrect?

1. The generative cell divides and forms the two male gametes.
2. If the female parent produces unisexual flowers, then there is no need for emasculation for artificial hybridisation.
3. The ability of the pistil to recognise the pollen followed by its acceptance or rejection is the result of a continuous dialogue between pollen grain and the egg cell.
4. One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing the syngamy.

Q. Tapetum occurs in

1. Anther wall
2. Ovary wall
3. Male gametophyte
4. Female gametophyte

Q.

Three out breeding devices

Q. Barrier to avoid self-pollination between stamens and pistil is

1. Heterostyly
2. Herkogamy
3. Dichogamy
4. Dicliny

Q.

Pls tell me about nectar in flowers.in detail...

Q. In an experiment, a flower from the pea plant (pure line) that produces constricted pods was emasculated and bagged. Meanwhile, pollen from another pea plant (pure line) that produces inflated pods was collected and dusted on the stigma of the emasculated flower. The flower, after pollination, was rebagged.
Assuming that the plants were otherwise similar in all other characters, predict the phenotype of the offspring of the $F_1$ generation.

1. Inflated pod shape
2. Constricted pod shape
3. Both inflated and constricted pod shape
4. Difficult to predict the phenotype of the progeny

Q. Describe pollen-pistil interaction in detail.

Q. The present on the surface of the pollen and the stigma determine whether they are comptatible or incompatible.

1. antigens
2. proteins
3. nucleoproteins
4. lipids

Q. (unisexual, fertilisation, fruit, stamen, anther, bisexual, pollination, seed, ovary)
The ovary of the flower develops into a .........

Q. Spirogyra are commonly known as “Pond Silk” because its:

1. Filament are made up of silk
2. Filament are slippery to touch.
3. Filaments are very bright.
4. Filament makes the pond slippery.

Q.

The acceptance or rejection of pollen is based on the biochemical interaction between the components of the pollen wall and pistil head.

1. False

2. True

Q.

even though each pollen grain has 2 male gametes , y r at least 10 pollen grains and not 5 pollen grains reqd 2 fertilise 10 ovules present in a particular carpel?

Q. What is dynamic process ? Why pollen-pistil interaction is a dynamic process ?

Q.

Pollen-pistil interaction involves

1. Pollen deposition on stigma

2. Rejection or acceptance of pollen by stigma

3. Entry of pollen tube into ovule

4. All of these

Q.

What is the cell:nuclei ratio in the given image of a germinating pollen?

1. 4:2

2. 3:2

3. 2:1

4. 1:2