Question 1

Question 1Distinguish between the following pairs(a) Monoecious and Dioecious plants(b) Perfect and Imperfect flowers(c) Unisexual and Bisexual flowers(d) Essential and Non-essential whorls of a flower(e) Polyandrous and Polyadelphous stamens

Accepted Answer

(a) Difference between Monoecious and Dioecious plants:Monoecious plantsDioecious plantsMale and female flowers grow on the same plant.Male and female flowers grow on different plants.(b) Difference between Perfect and Imperfect flowers:Perfect flowersImperfect flowersA flower which contains all the four whorls.A flower in which one or more whorls is missing.(c) Difference between Unisexual and Bisexual flowers:Unisexual flowersBisexual flowersA flower which has either stamen or carpel is called unisexual flower.A flower which has stamen as well as carpel is called Bisexual flower.(d) Difference between Essential and Non-essential whorls of a flower:Essential whorlsNon-essential whorlsEssential whorls of the flower are androecium and gynoecium.Non-essential whorls of the flower are calyx and corolla.Essential whorls are directly concerned with reproduction.Non-essential whorls either protect the reproductive parts of the flower or make the flower attractive for pollination.(e) Difference between Polyandrous and Polyadelphous stamens:Polyandrous stamensPolyadelphous stamensThe filaments of the stamens are free.The filaments of the stamens are united in the multiple groups.

Question 2

Question 1(vii)Which part of the pistil serves as the landing place for pollen grains?StyleOvaryStigmaOvules

Accepted Answer

StigmaReason — Stigma is the top most portion of carpel that receives pollen grains.

Question 3

Question 1(ix)The condition of androecium, when, all the stamens are free from each other is termed as :PolyadelphousPolysepalousPolyandrousPolypetalous

Accepted Answer

PolyandrousReason — When the stamens are free, such condition is called Polyandrous.

Question 4

Question 1(x)The flower which contains both stamens and carpels is called as:UnisexualPistillateStaminateHermaphrodite

Accepted Answer

HermaphroditeReason — The flower which contains both stamens and carpels is called a bisexual or hermaphrodite flower.

Question 5

Question 1(xi)Soumya tried to match the floral whorls with their constituting units.She tabulated the pairs as follows:UnitFloral whorlPPerianthQAndroeciumIdentify P and QP — Petals, Q — CarpelsP — Tepals, Q — StamensP — Sepals, Q — PetalsP — Carpels, Q — Stamens

Accepted Answer

P — Tepals, Q — StamensReason — When calyx and corolla are indistinguishable, they are known as tepals. Group of tepals is known as perianth. Group of stamen is known as androecium.

Question 6

Question 1(xii)A biology teacher asked her students to give two examples of dioecious plants.Ishan said: Maize and Palm.Aashish said: Pumpkin and Papaya.Palak said: Palm and Papaya.Payal said: Pumpkin and Maize.Who was correct?IshanAashishPalakPayal

Accepted Answer

PalakReason — Dioecious plants have male and female flowers on separate plants. Palm and Papaya are examples of dioecious plants whereas Maize and Pumpkin are examples of Monoecious plants where male and female flowers grow on the same plant.

Question 7

Question 2What is the difference between:(a) Flower and inflorescence?(b) Petals and petaloid tepals?

Accepted Answer

(a) Difference between flower and inflorescence:FlowerInflorescenceFlower is specialized shoot in which the leaves are modified into floral structures.Inflorescence is the mode of arrangement of flowers on the axis of a plant.(b) Difference between petals and petaloid tepals:PetalsPetaloid tepalsThe second whorl of flower derived from the corolla is called Petals.When sepals and petals cannot be differentiated from one another and are non-green, they are called Petaloid tepals.

Question 8

Question 4Draw a neat diagram of male (♂) and female (♀) reproductive organs of a flower.(a) Label two important parts of the male reproductive organ.(b) Label four important parts of the female reproductive organ.(c) Write the collective name/whorl of each reproductive organ.(d) Name the unicellular, sexual structures produced in each.(e) Name the parts of the female reproductive organ that develop into a fruit and seed respectively.

Accepted Answer

Below is the labelled diagram of male (♂) and female (♀) reproductive organs of a flower:(c) The collective name of male reproductive organs is Androecium and female reproductive organs is Gynoecium.(d) Pollen grains are produced in male reproductive organs and Ovules are produced in female reproductive organs.(e) Ovary develops into fruit and Ovules develop into seeds, respectively.

Question 9

Question 5Draw either an entire flower or a part of it showing the following conditions :(a) Polysepalous calyx(b) Gamosepalous calyx(c) Polypetalous corolla(d) Gamopetalous corolla(e) Bracteate flower

Accepted Answer

(a) Polysepalous calyx(b) Gamosepalous calyx(c) Polypetalous corolla(d) Gamopetalous corolla(e) Bracteate flower

Question 10

Question 3Given alongside is the structure of the female reproductive part of a flower. Read the information given alongside and fill in the blanks :Gynoecium is the innermost whorl of a flower which is made up of carpels. Its main function is production of female gametes that develop into seeds after the process of fertilization.The terminal knob-like part of the pistil is (a) ............... which is covered with hairs or with glandular papillae. (b) ............... is the tubular slender stalk which connects the uppermost part to the lowest part of the pistil. Ovary is the swollen basal portion composed of one or many (c) ............... fused together. Ovary contains one or more rounded bodies, the (d) ............... which are attached to the wall of the ovary with (e) ............... .

Accepted Answer

The terminal knob-like part of the pistil is Stigma which is covered with hairs or with glandular papillae. Style is the tubular slender stalk which connects the uppermost part to the lowest part of the pistil. Ovary is the swollen basal portion composed of one or many Carpels fused together. Ovary contains one or more rounded bodies, the Ovules which are attached to the wall of the ovary with Placenta.

Question 11

Question 6Fill in the blanks with suitable words :The floral parts are borne on the ............... in four whorls.The collective name of petals is ............... ................ and corolla are accessory whorls of the flower................ attaches the ovules to the wall of the ovary.The sweet fragrant liquid of flowers is termed as ............... .

Accepted Answer

The floral parts are borne on the thalamus in four whorls.The collective name of petals is corolla .Calyx and corolla are accessory whorls of the flower.Placenta attaches the ovules to the wall of the ovary.The sweet fragrant liquid of flowers is termed as nectar.

Question 12

Question 8Name the type of the androecium found inChina roseBombaxPea

Accepted Answer

China rose — The type of androecium found is Monadelphous.Bombax — The type of androecium found is Polyadelphous.Pea — The type of androecium found is Diadelphous.

The Flower

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