Question Pool Sexual Reproduction in Flowering Plants

Sexual Reproduction in Flowering Plants - SAMAGRA Question Pool & Answers | Class 12

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 12 Biology Sexual Reproduction in Flowering Plants

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Qn 1.

Fill in the blanks with suitable word

The outer hard layer of pollen grain is composed of ........................................



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Qn 2.

A mature male gametophyte has two cells.

   a) Name these  cells.

   b) Identify the cell  which has  an irregularly shaped nucleus.



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Qn 3.

The synergids have special cellular thickenings at the micropylar end.

     a) Name this structure.

      b) Write the function of that structure.

     c)Write the ploidy of synergids and antipodals.



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Qn 4.

Observe the following diagram and label the parts

 



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Qn 5.

Majority of flowering plants use a wide range of insects as pollinating agents. Write any six  adaptations seen in such plants .



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Qn 6.

Fill in the blank.

The residual persistent nucellus in some seeds such as black pepper and beet is called .............................

 



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Qn 7.

Angiosperm fertilisation is called double fertilisation. Substantiate this statement.



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Qn 8.

Wind pollination is quite common in grasses .What are the adaptations seen in grasses for wind pollination?



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Qn 9.

Write the useful and harmful effects of pollen grain ?



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Qn 10.

Pollen grain has two wall layers namely exine and intine.

a)Name the materials by which exine and intine are made up of?

b)Pollen grains are well preserved as fossils.Why?



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Qn 11.

A  typical mature embryo sac of angiosperm is a 8 nucleated and 7 celled structure. Explain how the embryo sac becomes 8 nucleated and 7 celled?



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Qn 12.

Artificial hybridisation is one of the major approaches of crop improvement programme. How stigma is protected in this approach if the flower is  bisexual?



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Qn 13.
Observe the fertilized embryo sac given in the figure  and label a,b,c and d.

 



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Qn 14.

Observe the following diagram and label any four parts.



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Qn 15.

Observe the given diagram and label the parts a, and b .Write any two peculiarities of b.



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Qn 16.

Observe the figure and label a.b.c and d.

 



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Qn 17.

Complete the table ussing appropriate terms :

A B
Parthenocarpic fruit -----------------a-------------------
....................b........... Formation seed without fertilisation
True fruit ...................c........................................
................d................ More than one embryo in a  seed                      

 



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Qn 18.

In  some seed persistent nucellus can be seen .Select the term for persistant nucellus from the following.

a) Endosperm   b)Albuminous seed   c) Pericarp  d) Perisperm 



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Qn 19.

Endosperm development precedes embryo  development. Substantiate this statement.



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Qn 20.

Flowering plants have developed many devices to discourage self pollination and to encourage cross pollination. List  any four such devices in plants.



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Qn 21.

True fruits and false fruits are two types of fruits seen in flowering plants . Differentiate these two.



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Qn 22.

Compare monocot and dicot embryo.



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Qn 23.

Depending on the source of pollen,pollination can be of  three types. Which are  they ? Explain.



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Qn 24.

Differentiate geitonogamy and xenogamy.



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Qn 25.

Cleistogamous flowers are invariably autogamous. Explain?

Write  any one advantage of cleistogamy ?           



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Qn 26.

Some characters of wind,water and insect pollinated plants are given below.Arrange  them in  appropriate headings based on pollinators?

            a) Long ribbon like pollen

            b) Light and non sticky pollen

            c) Presence of nectar

            d) Pollen grains covered with mucilage

            e) Exposed stamens

            f) Flowers  colourful and fragrant                            



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Qn 27.

Yucca and moth cannot complete their life cycles without each other. Justify  the statement .



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Qn 28.

Write  the processof pollination in Vallisneria .



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Qn 29.

In angiosperms, during  fertilization two fusions occur in the embryo sac.

Name the fusions and  the  products formed as a result of these fusions.



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Qn 30.

Fill in the blank

Occurence of more than one embryo in a seed is referred to as ...........................



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