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CHAPTERWISE QUESTIONS AND ANSWERS
SEXUAL REPRODUCTION IN FLOWERING PLANTS
1 mark questions
1. Which of the following part in a flower is diploid?
(a) Pollen grain (b) Egg
(c) PEN (d) Secondary nucleus
2. In some seeds the nucellus may be persistent. Such nucellus is called…………..
3. Observe the relationship between the first two terms and fill in the blank.
a. Overy wall : Pericarp
Integuments : --------------------
b. 2 celled pollengrain :- vegetative cell +generative cell
3 celled pollengrain :- vegetative cell +……………………..
4. Development of fruit without fertilization and are seedless known as
a) Polyembryony b) Apomixis
c) Parthenocarpy d) Parthenogenesis
5. ------------- is the proteinaceous layer which separate endosperm & embryo in a monocot seed
6. Observe the relationship between the first pair and fill in the blanks.
a. Perisperm :- Remnants of nucellus
------------: - Fruit wall
b. Parthenocarpy : Formation of fruit without fertilization
Apomixis : ---------------------
7. In maize, the chromosome number present in the meiocyte is 20. Give the number of chromosomes
present in the following.
a. Maize pollen
b. Maize endosperm
8. After syngamy & triple fusion in embryo sac, embryo will be diploid and endosperm will be………..
9. Innermost wall layer of microsporangium which nourishes the pollengrain is called-------------
10. Fruit which develop from any part of the flower other than ovary is called……………..
11. A date palm seed discovered during archeological investigation retained viability even after
10000years. The retention of viability is due to the state of inactivity of embryo is called…………..
12. Which among the following is a parthenocarpic fruit?
( Banana , Apple , Strawberry , Guava)
13. From the following, select the two having haploid chromosome number
(Egg, Endosperm, Zygote, Pollen)
14. In albuminous seed, food is stored in ------------
15. In the Coconut fruit, the coconut water is ………………
16. Observe the relationship between the first pair and fill in the blanks.
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Epicotyl :- Embryonal axis above the level of cotyledon
………….. :- Cylindrical portion below the level of cotyledon
17. Formation of more than one embryo in the seed is called……………
18. Animal visitors which consume pollengrains or nector without bringing about pollination are
called………………
19. Observe the relationship between the first pair and fill in the blanks
Pollen viability :- The period for which pollen grains remain fuctional
………………… :- Storage of pollengrains for years in liquid nitrogen (-196°C)
20. Most resistant organic material on exine of pollengrains
(a) Sporopollenin (b) Cellulose (c) Chitin (d) Pectin
21. Name two plants where remnants of nucellus can be found in the seed
2 mark questions
22. Most of the plants produce single type of flowers but Viola, Commelina and Oxalis produce two
types of flowers. Explain
23. A microsporangium is surrounded by four layers. Name the first three layers and write their
function
24. Flowering plants have developed many devices to discourage self pollination and to encourage
cross pollination. List out such features found in plants (any 2 point)
25. Differentiate true fruits from false fruits. Give one example for each.
26. A typical angiosperm embryo sac is 7 celled and 8 nucleate.
a. Explain monosporic type of embryo sac development
b. Name haploid cells present in embryosac other than egg cell
27. Observe the events given below
(Embryogenesis , Gametogenesis , Syngamy)
Choose a post fertilization event from the above and define it
28. Zygote is dormant for some time in fertilized ovule. Why?
29. Apomictic seeds are used in hybrid industry. Why?
30. Give reason
a. Hybrid seeds have to be produced year after year
b. Ground nut seeds and Castor seeds are dicot seeds. But ground nut seeds are ex-
albuminous and castor seeds are albuminous.
31. Fusion of polar nuclei with male gamete in double fertilisaton result in the formation of endosperm.
a. Write down the function of endosperm
b. Write briefly about the endosperm development in coconut.
32. The early stages of embryo development are similar in both dicots and monocots. However,
mature embryos have differences. Write the difference between dicot embryo and monocot
embryo.
33. (a) What is meant by Seed dormancy?
(b)Write any two significance of seed dormancy
34. Analyse the table given below and fill in the blanks.
Stalk of the ovule ……………(a)………………..
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…………(b)……….. Nucellus
Protective envelopes ……………..(c)………….
of the ovule
Junction between ……………..(d)………….
ovule and its stalk
35. (a) Pollengrains are preserved as fossil. Why?
(b)How do pollengrains of many species affect human health ?
36. Explain pollen pistil interaction
37. If the female parent produces bisexual flowers, emasculation is necessary in artificial hybridization.
a. What is emasculation
b. Write down the importance of emasculation
38. Give reasons.
(a) Pollen tablets are in use by people these days
(b) Self incompatibility discourage self pollination.
39. A typical angiosperm embryosac is 7 celled 8 nucleate stage.
(a) Name the cells that constitute egg apparatus?
(b) Name the diploid cell present in embryosac
40. Different stages of development in a dicot embryo are given below. Arrange them in the correct
sequential order
(Heart shaped embryo , Globular embryo , Mature embryo, Proembryo)
41. Name the special cellular thickening present in the synergids at micropylar end. Write its function
42. Polyembryony is the formation of more than one embryo in the seed.
a. What are the reasons for polyembryony
b. Give one example
43. How is it possible in Oxalis and Viola plants to produce assured seed set even in the absence of
pollinators?
44. What are the features of tapetum?
3 mark questions
45. You are supplied with vallisneria & Zostera
a. Write down the type of pollination among these flowers.
b. Write down any four floral characters to suit the pollination
46. Wind is a common abiotic agent of pollination.
a. Write any four features of wind pollinated flowers
b. Give two examples for wind pollinated flowers
47. In large number of plants, pollination is carried out by insects.
a. List out four characters of flowers that helps insect pollination
b. Give two examples for such flowers
48. Depending on the source of pollen, pollination can be divided into three types.
a. What are they?
b. Explain each
49. Artificial hybridization is one of the major approaches for crop improvement programme.
a. How can we protect stigma from unwanted pollen
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b. How artificial hybridization can be performed?
50. The diagram given below shows the transverse section of a young anther.
a. Identify the parts a,b,c and d.
b. How many microsporangia are present in a typical bilobed anther of angiosperm?
c. Expand PMC
51. Identify the given figure & explain the following terms
( Scutellum , Coleoptile, Coleorhiza)
52. (a) Differentiate between microsporogenesis and megasporogenesis.
(b)Name male and female gametophyte in angiosperm
53. Observe the figure of mature pollengrain and answer the questions
a. Identify the two cells
b. Write the peculiarities of each of them
54. Arrange the following terms in their correct developmental sequence
(Pollengrain , Sporogenous tissue , Anther , Microspore tetrad, Pollen mother cell , Male gamete)
55. Describe in sequence the process of megasporogenesis and female gametophyte in angiosperms.
56. Double fertilization is a characteristic feature of angiosperms.
a. Which are the events in double fertilization?
b. Identify A, B, C & D
Male gamete + …………(A)…….. →Zygote (2n) → ………(B)………
Male gamete + ………(C)……… → PEN (3n) → ……………(D)……
57. Flowers are classified into Chasmogamous and Cleistogamous flowers.
a. Cleistogamous flowers are autogamous. Justify
b. What are the advantages and disadvantages of Cleistogamous flowers
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CHAPTERWISE QUESTIONS AND ANSWERS
SEXUAL REPRODUCTION IN FLOWERING PLANTS
1 mark questions
1. Which of the following part in a flower is diploid?
(a) Pollen grain (b) Egg
(c) PEN (d) Secondary nucleus
2. In some seeds the nucellus may be persistent. Such nucellus is called…………..
3. Observe the relationship between the first two terms and fill in the blank.
a. Overy wall : Pericarp
Integuments : --------------------
b. 2 celled pollengrain :- vegetative cell +generative cell
3 celled pollengrain :- vegetative cell +……………………..
4. Development of fruit without fertilization and are seedless known as
a) Polyembryony b) Apomixis
c) Parthenocarpy d) Parthenogenesis
5. ------------- is the proteinaceous layer which separate endosperm & embryo in a monocot seed
6. Observe the relationship between the first pair and fill in the blanks.
a. Perisperm :- Remnants of nucellus
------------: - Fruit wall
b. Parthenocarpy : Formation of fruit without fertilization
Apomixis : ---------------------
7. In maize, the chromosome number present in the meiocyte is 20. Give the number of chromosomes
present in the following.
a. Maize pollen
b. Maize endosperm
8. After syngamy & triple fusion in embryo sac, embryo will be diploid and endosperm will be………..
9. Innermost wall layer of microsporangium which nourishes the pollengrain is called-------------
10. Fruit which develop from any part of the flower other than ovary is called……………..
11. A date palm seed discovered during archeological investigation retained viability even after
10000years. The retention of viability is due to the state of inactivity of embryo is called…………..
12. Which among the following is a parthenocarpic fruit?
( Banana , Apple , Strawberry , Guava)
13. From the following, select the two having haploid chromosome number
(Egg, Endosperm, Zygote, Pollen)
14. In albuminous seed, food is stored in ------------
15. In the Coconut fruit, the coconut water is ………………
16. Observe the relationship between the first pair and fill in the blanks.
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Epicotyl :- Embryonal axis above the level of cotyledon
………….. :- Cylindrical portion below the level of cotyledon
17. Formation of more than one embryo in the seed is called……………
18. Animal visitors which consume pollengrains or nector without bringing about pollination are
called………………
19. Observe the relationship between the first pair and fill in the blanks
Pollen viability :- The period for which pollen grains remain fuctional
………………… :- Storage of pollengrains for years in liquid nitrogen (-196°C)
20. Most resistant organic material on exine of pollengrains
(a) Sporopollenin (b) Cellulose (c) Chitin (d) Pectin
21. Name two plants where remnants of nucellus can be found in the seed
2 mark questions
22. Most of the plants produce single type of flowers but Viola, Commelina and Oxalis produce two
types of flowers. Explain
23. A microsporangium is surrounded by four layers. Name the first three layers and write their
function
24. Flowering plants have developed many devices to discourage self pollination and to encourage
cross pollination. List out such features found in plants (any 2 point)
25. Differentiate true fruits from false fruits. Give one example for each.
26. A typical angiosperm embryo sac is 7 celled and 8 nucleate.
a. Explain monosporic type of embryo sac development
b. Name haploid cells present in embryosac other than egg cell
27. Observe the events given below
(Embryogenesis , Gametogenesis , Syngamy)
Choose a post fertilization event from the above and define it
28. Zygote is dormant for some time in fertilized ovule. Why?
29. Apomictic seeds are used in hybrid industry. Why?
30. Give reason
a. Hybrid seeds have to be produced year after year
b. Ground nut seeds and Castor seeds are dicot seeds. But ground nut seeds are ex-
albuminous and castor seeds are albuminous.
31. Fusion of polar nuclei with male gamete in double fertilisaton result in the formation of endosperm.
a. Write down the function of endosperm
b. Write briefly about the endosperm development in coconut.
32. The early stages of embryo development are similar in both dicots and monocots. However,
mature embryos have differences. Write the difference between dicot embryo and monocot
embryo.
33. (a) What is meant by Seed dormancy?
(b)Write any two significance of seed dormancy
34. Analyse the table given below and fill in the blanks.
Stalk of the ovule ……………(a)………………..
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…………(b)……….. Nucellus
Protective envelopes ……………..(c)………….
of the ovule
Junction between ……………..(d)………….
ovule and its stalk
35. (a) Pollengrains are preserved as fossil. Why?
(b)How do pollengrains of many species affect human health ?
36. Explain pollen pistil interaction
37. If the female parent produces bisexual flowers, emasculation is necessary in artificial hybridization.
a. What is emasculation
b. Write down the importance of emasculation
38. Give reasons.
(a) Pollen tablets are in use by people these days
(b) Self incompatibility discourage self pollination.
39. A typical angiosperm embryosac is 7 celled 8 nucleate stage.
(a) Name the cells that constitute egg apparatus?
(b) Name the diploid cell present in embryosac
40. Different stages of development in a dicot embryo are given below. Arrange them in the correct
sequential order
(Heart shaped embryo , Globular embryo , Mature embryo, Proembryo)
41. Name the special cellular thickening present in the synergids at micropylar end. Write its function
42. Polyembryony is the formation of more than one embryo in the seed.
a. What are the reasons for polyembryony
b. Give one example
43. How is it possible in Oxalis and Viola plants to produce assured seed set even in the absence of
pollinators?
44. What are the features of tapetum?
3 mark questions
45. You are supplied with vallisneria & Zostera
a. Write down the type of pollination among these flowers.
b. Write down any four floral characters to suit the pollination
46. Wind is a common abiotic agent of pollination.
a. Write any four features of wind pollinated flowers
b. Give two examples for wind pollinated flowers
47. In large number of plants, pollination is carried out by insects.
a. List out four characters of flowers that helps insect pollination
b. Give two examples for such flowers
48. Depending on the source of pollen, pollination can be divided into three types.
a. What are they?
b. Explain each
49. Artificial hybridization is one of the major approaches for crop improvement programme.
a. How can we protect stigma from unwanted pollen
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b. How artificial hybridization can be performed?
50. The diagram given below shows the transverse section of a young anther.
a. Identify the parts a,b,c and d.
b. How many microsporangia are present in a typical bilobed anther of angiosperm?
c. Expand PMC
51. Identify the given figure & explain the following terms
( Scutellum , Coleoptile, Coleorhiza)
52. (a) Differentiate between microsporogenesis and megasporogenesis.
(b)Name male and female gametophyte in angiosperm
53. Observe the figure of mature pollengrain and answer the questions
a. Identify the two cells
b. Write the peculiarities of each of them
54. Arrange the following terms in their correct developmental sequence
(Pollengrain , Sporogenous tissue , Anther , Microspore tetrad, Pollen mother cell , Male gamete)
55. Describe in sequence the process of megasporogenesis and female gametophyte in angiosperms.
56. Double fertilization is a characteristic feature of angiosperms.
a. Which are the events in double fertilization?
b. Identify A, B, C & D
Male gamete + …………(A)…….. →Zygote (2n) → ………(B)………
Male gamete + ………(C)……… → PEN (3n) → ……………(D)……
57. Flowers are classified into Chasmogamous and Cleistogamous flowers.
a. Cleistogamous flowers are autogamous. Justify
b. What are the advantages and disadvantages of Cleistogamous flowers
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