Pollination and Fertilization Concise ICSE Class-9 Selina Publishers

Selina Publishers solutions Chapter-5 pollination and Fertilization

Pollination and Fertilization Concise ICSE Class-9 Biology Selina Publishers Chapter-5. We Provide Solutions of Progress Check , MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type Questions and Structured / Applications / Skill Type Questions of Exercise-5 Pollination and Fertilization. Visit official Website CISCE  for detail information about ICSE Board Class-9.

Pollination and Fertilization Concise ICSE Class-9 Selina Publishers


–: Select Topics :–

Progress Check (page-43),

Progress Check (page-45),

A.MULTIPLE CHOICE TYPE,

B.VERY SHORT ANSWER TYPE,

C.SHORT ANSWER TYPE,

D.LONG ANSWER TYPE

E.STRUCTURED/APPLICATION/SKILL TYPE


Note :-  Before Viewing Concise Solutions of Chapter-5 Pollination and Fertilization . Read the whole chapter carefully with figure. Focus on Explanation , advantage and dis – advantages of self and cross- pollination and the characteristic feature of flower pollinated by various agent such as insects, wind and water of Chapter-5 Pollination and Fertilization .

Hence  brief ideas as a how nature favors  cross pollination. Therefore Events taking place between pollination and fertilization leading to the formation of zygote in the embryo sac in Chapter-5 Pollination and Fertilization . A brief explanation of the term double fertilization and triple fusion in Chapter-5 Pollination and Fertilization . Chapter-5 Pollination and Fertilization is very important Chapter in ICSE Class 9th biology.


Progress Check (page-43), Chapter-5 Pollination and Fertilization Selina Biology Solutions

Question 1 

Match the term……….

Answer 1

(i)……….Wind

(ii)……….Dichogamy

(iii)……….Rafflesia

(iv)………Entomophious

Question 2

Complete the following statement

(i)

(ii)

(iii)

(iv)

(v)

(vi)

Answer 2

(i) Pollen grains

(ii) Cross Pollination  , Self Pollination

(iii) Large

(iv) Stamen Carpel

(v) New

(vi) Cross


Progress Check (page-45), Chapter-5 Pollination and Fertilization Selina Biology Solutions

 

Question 1

Mention if ……….true

(i)

(ii)

(iii)

(iv)

(v)

Answer 1

(i)  False

(ii) True

(iii) True

(iv) False

(v) True


   Review Questions

Chapter-5 Pollination and Fertilization Selina Biology Solutions A. MULTIPLE CHOICE TYPE

Question 1

Which one of the following is one of the characteristics of self-pollinated flowers?

(a) Flowers are large and showy

(b) Flowers remain closed and do not open

(c) Stigma and anthers mature at the same time

(d) Pollen is produced in very large quantities

Answer 1

(c) Stigma and anthers mature at the same time

Question 2

Exineand intine are the parts of

(a) Embryo sac

(b) Pollen grain

(c) Stigma

(d) Seed

Answer 2

(b) Pollen grain


Chapter-5 Pollination and Fertilization B. VERY SHORT ANSWER TYPE Selina Biology Solutions

 Question 1

State the name of the chief pollinating agent against the corresponding plant by choosing from those given in brackets.

(a) Dahlia_______ (crow, butterflies, mosquito).

(b) Maize_______ (bees, locusts, rain, wind).

(c) Vallisneria _______ (wind, water, ants, rabbits).

Answer 1

(a) butterflies

(b) wind

(c) water

Question 2

Match the items in Column A with those in Column B.

Column A Column B
(a) Generative
nucleus
(i) Pollen tube
(b) Germ pore (ii) Endosperm
nucleus
(c) Exine (iii) Testa
(d) Secondary nucleus (iv) Fertilization
(e) Integument (v) Male nuclei
(f) Egg nucleus (vi) Rough

 

Answer 2

 

Column A Column B
(a) Generative
nucleus
(i) Male
nuclei
(b) Germ pore (ii) Pollen tube
(c) Exine (iii) Rough
(d) Secondary nucleus (iv) Endosperm
nucleus
(e) Integument (v) Testa
(f) Egg nucleus (vi) Fertilization

 

Question 3

Fill in the blanks with suitable words.

(a) Transference of pollen grains from anthers to stigma of the same flower is called ________.

(b) Different timings for maturation of gynoecium and androecium is called ________.

(c) _______ is a water-pollinated flower.

Answer 3

(a) autogamy

(b) dichogamy

(c) Vallisneria

Question 4

Name of the parts of the ovary which give rise to:

(a) Seed ______

(b) Fruit ______

(c) Fruit wall ______

Answer 4

(a) Ovules

(b) Ovary

(c) Ovarian wall

Question 5

Give one word/term for the following:

(a) A flower containing both male and female parts.

(b) Arrangement of flowers on a twig/stem.

(c) When pollen grains of a flower reach the stigma of the same flower.

(d) When maturation time of reproductive parts in a flower is different.

(e) When stigma and anthers do not grow up to same height, which favours only cross pollination.

(f) Pollination of flowers by insects.

(g) Pollination of flowers by birds.

Answer 5

(a) Bisexual flower

(b) Inflorescence

(c) Self-pollination/Autogamy

(d) Dichogamy

(e) Heterostyly

(f) Entomophily

(g) Ornithophily


Solutions of Chapter-5 Pollination and Fertilization C. SHORT ANSWER TYPE :

Question 1

Explain the following terms:

(a) Ornithophily

(b) Elephophily

(c) Artificial pollination

Answer 1

(a) Ornithophily-Pollination affected by birds

(b) Elephophily-Pollination affected by elephants

(c) Artificial pollination-Pollination affected by man through artificial means

Question 2

What happens to the following after fertilization?

(a) Ovules

(b) Calyx

(c) Petals

(d) Stamens

Answer 2

(a) Ovules-Seed

(b) Calyx-Falls off or remains intact in dried and shrivelled form

(c) Petals-Fall off

(d) Stamens-Fall off

Question 3

Mention any two contrivances in flowers which favour cross-pollination.

Answer 3

Contrivances in flowers which favour cross-pollination:

  1. Unisexuality
  2. Different timings of maturation ofandroeciumand gynoecium
  3. Self-sterility
  4. Structural barriers

D. LONG ANSWER TYPE Chapter-5 Pollination and Fertilization

 

Question 1

What are the advantages of the following in the flower to the plant concerned?

(a) Long and feathery stigma

(b) Brightly coloured petals

(c) Smooth and light pollen

(d) Protruding and easily movable anthers

(e) Fragrant nectar

Answer 1

(a) Long and feathery stigma: Help to trap pollen grains in wind-pollination

(b) Brightly coloured petals: Attracting insects for cross-pollination

(c) Smooth and light pollen: Easily carried by wind to enable cross-pollination

(d) Protruding and easily movable anthers: Even slightest wind can move them

(e) Fragrant nectar: Attracting insects for pollination

Question 2

Describe the advantages and disadvantages of cross-pollination to the plant.

Answer 2 

Advantages of cross-pollination:

  1. The offspring are healthier.
  2. The seeds produced are abundant and viable.
  3. New varieties may be produced by cross-pollinating two different varieties of the same species.

Disadvantages of cross-pollination:

  1. Pollination is not always certain.
  2. The pollen has to be produced in large quantity.
  3. The process is uneconomical for the plant because the flowers have to be large,coloured, scented and have to produce nectar for attracting pollinating agents.

E. STRUCTURED/APPLICATION/SKILL TYPE Chapter-5 Pollination and Fertilization

 

Question 1

What is the ? Explain it with the help of a diagram.

Answer 1

function of the pollen tube

The pollen tube grows out of the pollen grains by breaking through its exine. Then pollen tube grows through the stigma and style by dissolving these tissues with the help of enzymes and reaches the ovary, where it enters the ovule through a minute pore called the micropyle.

Question 2

Given alongside is a diagrammatic sketch of the sectional view of a germinating pollen grain. Study the same and then answer the questions that follow:

pollen grain

(a) Name the parts labelled 1, 2, 3, 4 and 5.

(b) Where does the germination of the pollen grain take place and how?

(c) What is the function of the part labelled ‘4’?

(d) What happens to the part labelled ‘5’ during the process?

Answer 2

(a)

1 → Exine

2 → Intine

3 → Pollen tube

4 → Tube nucleus

5 → Generative nucleus

(b) Germination of the pollen grain takes place only after it falls on the stigma of the same plant species. Then The pollen grain is stimulated to germinate due to the secretion of sugars by the stigma.

(c) The function of part ‘4’ (tube nucleus) is to direct the growth of the pollen tube towards the ovary.

(d) During germination of the pollen grain, part ‘5’ (generative nucleus) present at the tip of the pollen tube divides into two sperm nuclei. Therefore The pollen tube enters one of the synergids and releases its two sperm nuclei. Of these, one sperm nucleus enters the egg cell and fuses with its nucleus, while the other sperm nucleus moves towards the two polar nuclei in the central cell and fuses with them.

Question 3

Given below is a diagrammatic representation of the process of fertilization. Study the same and then answer the questions that follow:

process of fertilization

(a) Name the parts labelled 1, 2, 3, 4, 5 and 6.

(b) What happens to

(i) Ovary

(ii) Ovule after fertilisation

(c) What is the function of the synergids?

(d) What part does the stigma play in the process of fertilisation?

Answer 3

(a)

1 → Style

2 → Pollen tube

3 → Polar nuclei

4 → Embryo sac

5 → Antipodal cells

6 → Micropyle

(b) After fertilisation

(i) The ovary enlarges to form the fruit and the ovarian wall forms the fruit wall.

(ii) The ovule becomes the seed.

(c) Synergids

 help in nourishing the egg cell, guiding the pollen tube towards the egg, proper functioning of the pollen tube and release of sperm nuclei.

(d) Pollen grain is transferred to the stigma during pollination. And Germination of pollen grain takes place only if it falls on the stigma. After germination, Hence the pollen tube grows through the stigma and reaches the ovary for the fertilization of the egg cell.

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