Practice Assignment 2
(Based on Chapter 2 — The Flower)
1. Name the following :
(a) The outermost whorl in a flower. (b) The innermost whorl in a bisexual flower.
(c) Two complete flowers. (d) Two incomplete flowers.
(e) Two unisexual flowers. (f) Two bisexual flowers.
(g) Two seeds containing two cotyledons each.
(h) Two seeds containing only one cotyledon.
(i) Three conditions necessary for germination of a seed.
2. Define the following :
(a) Flower (b) Complete flower (c) Incomplete flower (d) Unisexual flower
(e) Pollination (f) Fertilisation (g) Zygote (h) Fruit
(i) Epigeal germination (j) Hypogeal germination (k) Embryo
3. Differentiate between the following :
(a) Calyx and corolla (b) Complete flower and incomplete flower
(c) Pollination and fertilisation (d) Self-pollination and cross-pollination
(e) Insect-pollinated and wind-pollinated flowers (f) Seed and fruit
(g) Dicotyledonous seeds and monocotyledonous seeds (h) Hypogeal germination and epigeal germination
(i) Stamen and carpel
4. Answer the following questions :
(a) Describe the functions of a flower
(b) Describe the functions of different parts of a flower
(c) By means of a diagram, show the parts of a fruit.
(d) What part is played by stamens and carpels in reproduction?
5. Fill in the blanks :
(a) The four whorls of a flower are ........................................., .................................. and ...................................
(b) Pollen is produced inside .........................
(c) Female sex cell is present inside the .........................
(d) After fertilisation, ovules grow into ........................., and ovaries into.........................
(e) In hypogeal germination, the cotyledons remain ..................................................... the soil. (above/below)
6. Give one word for the following :
(a) Transfer of pollen grains from the anther to the stigma.
(b) Fusion of male gamete with the female gamete.
(c) The central part of a flower.
(d) Structure which produces pollen grains in a flower.
7. Draw labelled diagrammatic sketches of the following :
(a) A stamen (b) A carpel
8. Draw a labelled diagram of complete flower.
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9. Following is the picture of a flower. Write the names of its different parts on the blank lines [on points (a)
to (j)].
10. Study the three flowers (a), (b) and (c) in the following figures. Then answer the questions (by writing letter).
(i) Which flower makes pollen only? (ii) Which flower makes eggs only?
(iii) Which flower makes pollen and eggs? (iv) Which is the only self-pollinating flower?
(v) Which flower may get pollinated by flower ‘c’? (vi) Which flower may pollinate flower ‘b’?
(vii) In which flower can fertilisation take place?
11. Mark (ü) for the correct statements and (û) for the incorrect ones.
(a) Sexual reproduction takes place only in animals and not in plants.
(b) Zygote is formed by the fusion of a male gamete with a female gamete.
(c) Stamens are female gametes.
(d) Style is a part of ovary.
(e) A fertilized egg becomes a seed.
(f) A fruit is a fertilized ovary.
(g) A seed consists of only an embryo.
(h) Seeds and fruits which possess wings are dispersed by water.
(i) Pollen grains are produced in large quantity in wind-pollinated flowers.
(j) Pollen grains are male gametes.
(k) Fertilisation starts when pollen lands on a stigma.
(l) A stigma is the top part of a stamen.
(m) An egg is fertilized in an ovule.
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12. Match the two columns by drawing lines.
Column A Column B
(i) Egg, pollen (a) Male plant sex cells
(ii) Egg (b) The union of a male and female gamete
(iii) Pollen (c) Kinds of gametes
(iv) Bees (d) Female plant part where fertilisation takes place
(v) Fertilisation (e) Female plant sex cell
(vi) Ovary (f) Important pollen carriers
13. Fill in the blanks with the help of word-box given below. Some of the words may be used twice.
self-pollination insects wind stamens carpel cross-pollination pollination egg male gamete
(a) The male part of a plant is made up of .......................................... .
(b) The female part of a plant is called the .......................................... .
(c) In plants, fertilisation takes place when a .......................................... fuses with an ....................................... .
(d) The transfer of pollen from any stamen to any pistil is called ...............................
(e) The two kinds of pollination are ................................ and ................................ .
(f) The pollination of a carpel by pollen from the same flower is called .......................
(g) The pollination of a carpel by pollen from a different flower is called .......................
(h) The main carriers of pollen are ................................ and ................................ .
14. Word Scramble
Unscramble each of the following to form a word or term that you have read in this chapter.
(a) WELOFR (b) YROAV (c) SALITIFREONTI
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