TNPSC- Production in Plants - 10th Standard Science

1.   The method of reproduction in unicellular organisms like amoeba and bacteria in Which they split into two equal halves and produce new ones is called ________.
         a. Fragmentation
         b. binary fission
         c. budding
         d. Spore formation
         Answer:  b. binary fission

2.     In sexual reproduction of flowering plants, the first event involved in this is ________.
        a. Fertilization
        b. germination
        c. regeneration
        d. pollination
        Answer:   d. Pollination

3.    Which of the following statement is true?
        a. Thin - walled non – mobile spores are called zoospores
         b. A motile asexual spore produced by some algae, bacteria and fungi are Akinetes.
        c. Uninucleate, non – motile, asexual spores produced by fungus are called conidia.
        d. Thick – walled vegetative cells produced by algae during adverse conditions are called aplanospores.
        Answer:  c. Uninucleate, non – motile, asexual spores produced by fungus are called conidia

4.     The fertilized ovary is a fruit that develops from a single flower with multi carpellary, apocarpous superior ovary is ________.
         a. Aggregate fruit
         b. Composite fruit
         c. Simple fruit
         d. Multiple fruit
         Answer:  a.  Aggregate fruit

5.      If a water soaked seed is pressed, a small drop of water comes out through the ________.
        a. stomata
        b. lenticels
        c. micropyle
        d. radical
        Answer:  c. Micropyle

6.     The mango fruit is called as stone fruit. Because it has ________.
         a. skinny epicarp
         b. stony mesocarp
         c. fleshy endocarp
         d. hard endocarp
         Answer:  d. Hard endocarp

7.      Pick out the wrong statement
         a. In a dicot seed there is a short longitudinal whitish ridge called the raphae.
         b. The minute opening in a dicot seed is known as micropyle
         c. The rudimentary stem portion is known as radical.
         d. The rudimentary root portion is called radical.
         Answer:  The rudimentary root portion is called radical.

8.     Consider the following statements regarding the dispersal of fruits and seeds by wind and select the correct answer.
         a. Fruits and seeds are dispersed with a sudden jerk by an an explosive mechanism.
         b. The fruits of tridax carry a persistent calyx jerk by an explosive mechanism.
         c. The fruits of xanthium have sharp pointed stiff hooks.
         d. The mesocarp  of coconut is fibrous.
         Answer:  b. The fruits of tridax carry a persistent calyx modified into pappus.

9.     The product of triple fusion which acts as nutritive tissue for the development of an embryo is _______.  (APRIL – 2014)
         a. Zygote
         b. placenta
         c. scutellum
         d. endosperm
         Answer:  d. Endosperm

10.    The disadvantage of self – pollination is ________.
          a. There is no wastage of pollen grains
          b. The seeds are less in number
          c. Self – pollination is sure in bisexual flowers
          d. Flowers need not depend on agents of pollination
          Answer:  b. The seeds are less in number

11.    The flower is important to a plant because it helps in ________.
          a. attracting
          b. production of nectar
          c. pollination
          d. sexual reproduction
          Answer:  d. Sexual reproduction

12.   The essential organs of the flower are ________.
         a. Calyx and Corolla
         b. Androecium and Gynoecium
         c. Calyx and Androecium
         d. Corolla and Gynoecium
         Answer:  b. Androecium and Gynoecium

13.   Cross pollination is important for producing ________.
        a. new varieties of plants
        b. plants with better growth
        c. disease resistant plants
        d. all of the above
         Answer:  d. All of the above

14.   Anemophily occurs in ________.
        a. Vallisneria
        b. Grass
        c. Cocount
        d. Datrura
        Answer:  b. Grass

15.   Which of the following structure / arrangement favours entamophily?
        a. Pollen grains with wing and feathery stigma
        b. Colourful petals and nectar secretion
        c. A bunch of flowers with less pollen
        d. Pollen grains with mucous covering.
        Answer:  b. Colourful petals and nectar secretion

16.   Post – fertilization, the ovule changes into a / an ________.
        a. Seed
        b. Fruit
        c. endosperm
        d. pericarp
        Answer:  a. seed

17.   Which of the following is correctly matched?
         a. False fruit – mango
         b. Multiple fruit – apple
         c. Aggregate fruit – polyalthia
         d. Caryopsis – Banana
         Answer:  c. Aggregate fruit - Polyalthia

18.   Indentify the mismatched pair.
         a. Legume – Dry dehiscent fruit
         b. Cypsela – Dry indehiscent fruit
         c. Pome – Fleshy fruit
         d. Regma – Resembles legume

         Answer:  d. Regma – Resembles legume

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