Sexual Reproduction in Flowering Plants TS

A typical angiosperm anther is:

In over \( 60 \% \) of angiosperms, pollen grains are shed at:

Pollen grains lose viability within 30 minutes of their release in some members of:

An anatropous ovule attaches to the placenta by means of:

When the embryo-sac develops from a single functional megaspore [the other three get generate], it is called as:

The number of cycles of mitotic cell divisions the megaspore goes through, before the embryo sac is fully formed is:

In angiosperms, the mature female gametophyte is represented by:

How many nuclei in embryosac of an angiosperm are surrounded by cell walls?

What guides the entry of the pollen tube though the micropyle into the embryo sac in the angiosperms?

Cellular thickenings called filiform apparatus are seen in:

A typical angiosperm embryosac, at maturity, is:

Transfer of pollens from the anther to the stigma of the same flower is called:

Geitonogamy is:

The only type of pollination which during pollination brings a genetically different type of pollen grains to the stigma is:

Majority of Plants:

Which of the following is/are a marine plant pollinated by water?

The majority of water plants like water hyacinth and water lily are pollinated by:

Identify the incorrect statement regarding water- pollinated flowers:

Pollens grains are long ribbon-like and are carried passively in water in:

The dominating pollinating agent of flowering plants amongst animals are:

While planning for an artificial hybridization programme involving dioecious plants, which of the following steps would NOT be relevant?

During artificial hybridization in plant breeding experiments, if the female parent produces unisexual flowers:

In angiosperms, triple fusion results in the formation of:

Syngamy in angiosperms results in the formation of:

Double fertilization is:

Central cell in a female embryo sac, after triple fusion, becomes the:

In the most common type of endosperm development:

In Coconut:

\(
\begin{array}{|l|l|}
\hline \text { Statement I: } & \text { coconut water is a cellular endosperm } \\
\hline \text { Statement II: } & \text { kernel is the cellular endosperm } \\
\hline
\end{array}
\)

The endosperm is usually completely consumed by the developing embryo in all the following except:

Endospermic seeds are seen in:

Scutellum is:

Seeds offer several advantages to angiosperms Which of the following is not one?

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A):  Seed is the basis of our agriculture.

In the light of the above statements, choose the most appropriate answer from the options given below :

Reason (R): Dehydration and dormancy of mature seeds enable them to be stored and used as food throughout the year and also to
raise the crop in the next season.

Apomixis is:
I: production of seeds without fertilization
II: production of fruits without fertilization
III: a form of asexual reproduction that mimics sexual reproduction

Microsporangium is generally surrounded by 4 wall layers. Which of the following 3 wall layers perform the function of protection and help in the dehiscence of anther to release the pollen ?

Each cell of sporogenous tissue in anther is –

Which of the following is correct about Parthenium (Carrot grass)?

In angiosperms pollination occurs when pollen grains are in –

Which of the following statements is false ?
I. Pollen grains represents immatured male gametophyte
II. In angiosperms partially developed male gametophytes are pollinated
III. Generative cell is siponogenous while vegetative cell is spermatogenous
IV. Formation and differentiation of pollen grains is called microsporogenesis
V. Hay fever is a pollen allergy
VI. Pollen grains of some plants produce severe allergy and respiratory or bronchial diseases
VII. Pollen grains are poor in nutrients.

Embryo sac is monosporic when it develops from –

For the formation of embryo sac, the megaspore mother cell undergoes –

Which of the following points is incorrect about sporopollenin ?

Diversity of structures of the inflorescences, flower and floral parts –

As the anthers mature and dehydrate, the _______ separate dissociate from each other and develop into

A monocarpic plant in are which:-

During the formation of embryo sac from megaspore mitotic divisions occurs. These mitotic divisions are –

I. Flowers are small. They are often packed in inflorescence
II. Flowers are colourless, nectarless and odourless
III. Well exposed stamens
IV. Pollen grains – produced in large number, light, non-sticky
V. Flowers often have a single ovule in each ovary
VI. Stigma – large, often feathery.
The above contrivances favour-

Self-incompatibility –

In double fertilization total number of male nuclei and total number of female nuclei involved are-

The world’s oldest viable seed, excavated from Arctic Tundra is of :