In angiospermic plant having chromosome number of 12 will have chromosome number in integuments and nucellus of

What is the fate of the seven cells of the embryo sac ?

The constant feature of embryo sac is

The most common type of pollination is –

When an ovary develops into a fruit, without fertilization, it is called

Solution

Parthenocarpy is the development of a fruit without the formation of seeds as a result of lack of pollination, lack of fertilization and lack of development. This condition can be artificially induced by application of hormones.

Which of the following has largest gametophyte ?

Solution

Bryophytes have gametophyte as their dominant stage. Thus, Funaria has the largest gametophyte.

Exine of pollen is formed by activity of

Which of the following statements about pollen and pollination is false ?

Evolution of the pollen grain rejected the need for swimming sperm in flowering plants.
At maturity, the pollen grain consists of two sperm nuclei and a tube nucleus.
The pollen tube enters the female gametophyte through the style.
The pollen grain makes twice the genetic contribution to endosperm cells than it does to the cells of the embryo.

Which of the following options is correct?

Pollination gives the guarantee of the promotion of post-pollination events that lead to fertilization.
The events – “from pollen depositionon stigma until pollen tubes enter the ovule” are together referred to as pollen-pistil interaction.
Pollen-pistil interaction is a dynamic process involving pollen recognition followed by only promotion(not re-jection) of the pollen.
Pistil has no ability to recognise the pollen, whether right or wrong type.

Cross-pollination is preferred over self-pollination because

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