Selina solutions concise biology class 9 icse Solutions for Chapter 5 pollination and fertilization

Exercises in Chapter 5 pollination and fertilization Grade 9

Exercise

Questions in Exercise

Match the items in Column I with those in Column II.

Column I Column II

(i) Feathery stigma

hanging out rafflesia

(ii) Different timings for maturation

of anthers and stigma Entomophilous

(iii)Pollination by elephant Wind pollination

(iv)Flowers produce nectar Dichogamy

Complete the following statements: (i) Pollination is the process of transfer of _____________ (ii) The two kinds of pollination are ________ and __________ (iii) For self-pollination the flowers need not be ___________ and showy. (iv) For self-pollination, _______ and ________ must mature at the same time. (v) Self-pollination does not yield _________ varieties. (vi) In __________ pollination there is much wastage of ____________.

Mention if the following statements are true

(i) Intine is the outer wall of pollen grain.

(ii) Pollen tube enters ovule through micropyle.

(iii) Zygote gives rise to embryo

(iv) Ovule becomes fruit.

(v) Dry sepals may persist in some fruits

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

Exine and intine are the parts of

(a) Embryo sac

(b) Pollen grain

(d) Seeda

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).

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) Fertlization (e) Integument (v) Male nuclei (f) Egg nucleus (vi) Rough

Fill in the blanks with suitable words.

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

(b) Different timings for maturation of gynoecium and androecium, is called __________

Name the parts of the ovary which give rise to:

(a) Seed _______

(b) Fruit __________

Give one word/term for the following:

(a) A flower containing both male and female parts

(b) Arrangement of flowers on a twig/stem

(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 crosspollination?

(f) Pollination of flowers by insects

(g) Pollination of flowers by birds.

Explain the following terms:

(a) Ornithophily

(b) Elephophily

What happens to the following after fertilization?

(a) Ovules

(b) Calyx

(d) Stamens

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

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

(a) Long and feathery stigma

(b) Brightly coloured petals

(d) Protruding and easily movable anthers

(e) Fragrant nectar

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

What is the function of the pollen tube? Explain it with the help of a diagram

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:

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

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

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

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

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

(b) What happens to (i) Ovary (ii) Ovule after fertilization?

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