Class 9 Seeds: Structure and Germination Mock Test (ICSE)

Topics in Seeds: Structure and Germination

• Structure of bean and maize seeds
• Monocot and dicot seeds
• Conditions for germination
• Epigeal and hypogeal germination

Seeds: Structure and Germination practice questions with answers

1. Q1Multiple choice·1 mark
   Which of the following is a characteristic feature of a monocotyledonous seed?

   1. (a)Absence of a seed coat
   2. (b)Radicle directly develops into a tap root system
   3. (c)Presence of two cotyledons
   4. (d)Presence of endosperm in mature seeds
   Show answer and step marks

   1. Correct option: (d) Presence of endosperm in mature seeds+1

   Answer: (d)
2. Q2Multiple choice·1 mark
   Which of the following features is characteristic of hypogeal germination?

   1. (a)The epicotyl elongates rapidly, leaving the cotyledons below the soil surface.
   2. (b)The cotyledons come above the soil, turn green and make food for the seedling.
   3. (c)The hypocotyl forms an arch that pulls the cotyledons out above the soil surface.
   4. (d)The cotyledons shrivel early and the radicle supplies food to the growing plumule.
   Show answer and step marks

   1. Correct option: (a) The epicotyl elongates rapidly, leaving the cotyledons below the soil surface.+1

   Answer: (a)
3. Q3Multiple choice·1 mark
   Which of the following sets of environmental conditions is essential for the germination of a seed?

   1. (a)Water, suitable temperature, and oxygen
   2. (b)Water, high temperature, and carbon dioxide
   3. (c)Oxygen, dry soil, and sunlight
   4. (d)Sunlight, water, and nitrogen
   Show answer and step marks

   1. Correct option: (a) Water, suitable temperature, and oxygen+1

   Answer: (a)
4. Q4Multiple choice·1 mark
   In a bean seed, the small pore through which water enters the seed during imbibition is called the:

   1. (a)Tegmen
   2. (b)Micropyle
   3. (c)Hilum
   4. (d)Radicle
   Show answer and step marks

   1. Correct option: (b) Micropyle+1

   Answer: (b)
5. Q5Long answer·4 marks
   Answer the following questions regarding the internal structure of seeds: (a) State two structural differences between the embryo of a bean seed and a maize grain with respect to their cotyledons. (b) Name the protective sheaths that enclose the plumule and the radicle respectively in a maize grain. (c) State the function of the aleurone layer present in a maize grain.
   Show answer and step marks

   1. (a)(i) Bean has two cotyledons; maize has a single cotyledon.+1
   2. (a)(ii) Bean cotyledons are thick and fleshy and store food; the maize cotyledon (scutellum) is thin and shield-shaped and absorbs food from the endosperm.+1
   3. (b)(i) Coleoptile encloses the plumule.+0.5
   4. (b)(ii) Coleorhiza encloses the radicle.+0.5
   5. (c) The aleurone layer contains protein-rich cells that help in secreting enzymes during germination to break down stored endosperm starch.+1

   Answer: (a) Bean has two thick, fleshy, food-storing cotyledons; maize has one thin, shield-shaped cotyledon (scutellum) that absorbs food from the endosperm. (b) Coleoptile (plumule), coleorhiza (radicle). (c) The aleurone layer secretes enzymes that digest the stored food of the endosperm during germination.

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