DAV BOOKS, STD - 5, CHAPTER - 2, PLANTS, EXERCISE

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CHAPTER 2 : PLANTS

EXERCISE QUESTIONS AND ANSWERS

A.     FILL IN THE BLANKS.

1.      _______ are known as food factories of the plant.

Ans: Leaves

2.      Plants, like _________, reproduce through roots.

Ans: Dahlia/ Asparagus/ Sweet potato (any one)

3.       _______ and _______ are the raw materials needed for photosynthesis.

Ans: Water and Carbon dioxide

4.      ________ is a small hole present on the seed.

Ans: Micropyle

5.      Movement of seeds, from one place to another, is called ________.

Ans: Seed dispersal

B.      MATCH THE FOLLOWING:

 

1.      Type of reproduction without seeds                             a. Chlorophyll

2.      Green pigment present in leaves                                   b. Banana

3.      A fruit that does not bear seeds                                     c. Bryophyllum

4.      Reproduction through leaves                                          d. Pea and ladyfinger

5.      Dispersal of seeds through cracking                               e. Vegetative reproduction

      Ans:

1.      Type of reproduction without seeds                            e. Vegetative reproduction

2.      Green pigment present in leaves                                  a. Chlorophyll

3.      A fruit that does not bear seeds                                    b. Banana

4.      Reproduction through leaves                                         c. Bryophyllum

5.      Dispersal of seeds through cracking                             d. Pea and ladyfinger 

 

C.      TICK THE CORRECT OPTION.

 

1.      The small baby plant, coming out of a seed is known as the -

(a)   Grain        (b) Stomata          (c) Root        (d) Seedling

      Ans: Seedling

2.      The process, by which a plant make its own food, is called –

(a)   Photosynthesis              (b) Germination          (c) Reproduction           (d) Dispersal

      Ans: Photosynthesis

 

3.      Which of these plants has only one cotyledon?

(a)   Gram       (b)  Pea       (c) Wheat       (d) Bean

       Ans: Wheat

4.      For proper germination, a seed needs –

(a)   Water only

(b)   Just the right temperature

(c)    Air only

(d)   Water, air as well as the appropriate temperature      

       Ans: Water, air as well as the appropriate temperature

5.      Lotus seeds are dispersed mainly through –

(e)   Insects       (b)  Birds       (c) Air       (d) Water

       Ans: Water

D.     ANSWER THE FOLLOWING QUESTIONS IN BRIEF.

 

1.      Name the pigment present in green leaves of a plant.

Ans: The green pigment present in green leaves of a plant is chlorophyll.

2.      Why do some plants feed on insects?

Ans: i) Some plants need extra food in addition to what they prepare by photosynthesis.

        ii) These plants grow in poor soil which lacks nitrogen salts.

So, these plants feed on insects for extra nourishment.

3.      Name the two methods of reproduction in plants.

Ans: The two methods of reproduction in plants are,

        i) Reproduction through seeds.

        ii) Reproduction through different parts of a plant, like underground stem, stem cutting, root and leaf.

4.      State the conditions required for the proper germination of a seed.

Ans: Appropriate air, water, soil and proper temperature, are the conditions required for the growth for the proper germination of a seed.

5.      State two plants that reproduce through stem cuttings.

Ans: Two plants that reproduce through stem cuttings are; Rose, Bougainvillea and Sugarcane (any two).

E.      ANSWER THE FOLLOWING QUESTIONS.

 

1.      Why do all seeds not germinate to form new plants?

Ans: i) If all the seeds fall at one place, they will not get sufficient nutrients and will not germinate.

ii) Some of seeds may not be of good quality.

iii) Some seeds may also get eaten by animals.

iv) Also, in the absence of suitable conditions like, soil, air, water and appropriate temperature, they will not germinate to form new plants.

2.      Seeds do not germinate when they are kept in an ice-box or refrigerator. Why?

Ans:i) Seeds need a proper temperature, that is neither too hot nor too cold, for its germination.

        ii) In an ice-box or refrigerator the temperature is too low.

 So, seeds do not germinate when they are kept in an ice-box or refrigerator.

3.      State the importance of vegetative reproduction in plants.

Ans: i) Vegetative reproduction is the easier and faster method of increasing the number of the

              same plant.

        ii) It also helps to grow plants without seeds.

       iii) It also helps to produce better variety of plants.

4.      List any three natural ways of seed dispersal. Give one example for each of them.

Ans: i) Dispersal by wind - Seeds of madar (aak), thistle and dandelion get dispersed through wind.

         ii) Dispersal by water - Coconut, water lily, Hydrilla and lotus disperse their seeds through water.

        iii) Dispersal by human and animals - watermelon, papaya, mango, pumpkin and gourd.

5.      How can one grow a rose plant without seeds?

Ans: i) First cut the stem of a grown up rose plant.

        ii) Then, the cutting should be planted at a suitable place.

        iii) If proper care is taken, then after some days it will produce new roots and shoots and will finally develop into a new rose plant.

In this way, one can grow a rose plant without seeds.

6.      State the function of following:

(a)   Seed coat        (b) Cotyledons         (c) Micropyle

Ans: (a) Seed coat:- The seed coat protects the seed from external conditions.

(b)   Cotyledons:- It stores food for the baby plant to grow.

(c)    Micropyle:- Micropyle allows water to enter into the seed.

 

7.      Write the ways of dispersal of seeds in the following plants.

PLANTS	WAYS/AGENTS OF DISPERSAL OF SEEDS
Madar
Lotus
Castor
Beans
Mango
Water lily

 

Ans:

PLANTS	WAYS/AGENTS OF DISPERSAL OF SEEDS
Madar	Wind
Lotus	Water
Castor	Humans and Animals
Beans	By cracking and bursting
Mango	Human and animals
Water lily	Water