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Reproduction In Plants DAV Class 7


If you are searching for DAV Class 7 Science Chapter 9 Reproduction In Plants Question Answer then you have come to right place. Here you will solutions of DAV NCERT Books. 
So follow us for more solutions. 



SOMETHING TO KNOW 

A. Fill in the blanks.

1.Yeast reproduce through the process of budding. 

2.Pollen grains are produced by Anther.

3.The agents, that carry the pollen grains from anther to stigma, are called Pollinators. 

4 The fusion of male gamete with a female gamete is called Fertilization. 

5.Seeds of orchid gets dispersed by Wind. 

B. Write True Or False for the following statements . 

1. Yeast reproduces asexually through fragmentation. False 

2.Sweet potatoes and dahlia use their roots for asexual reproduction. True 

3. A unisexual flower has both stamen and pistil in it. False 

4.Water can be an agent of pollination. True
 
5.Male and female gametes fuses to form the zygote . True 

6. Seeds of pea and bean are formed in pods. True 

C. Tick the correct answer. 

1. Spirogyra reproduces asexually by-
Answer: (a) Fragmentation

2. Bryophyllum reproduces by its -
Answer: (b) Leaves 

3. The reproductive part of the plant for sexual reproduction, is its-
Answer:(a) Flower

4.Pollen grains contains the -
Answer:(c) Male reproductive cell

5.Fruit develops from the -
Answer: (a) Ovary. 


D. Answer the following questions in brief. 

1. Name the two types of reproduction in plants. 
Answer: Two types of reproduction in plants are :-
(a) Sexual reproduction
(b) Asexual reproduction. 

2.Define vegetative propagation. 
Answer: When a new plant is born from vegetative part of a plant, this is called vegetative propagation. 

3. Give two examples of plants which reproduce through spore formation. 
Answer: Rhizopus and some bacteria. 

4. Name two artificial methods of vegetative propagation. 
Answer: Two artificial methods are:-
(I) Stem Cutting
(II) Mound Layering. 

5. When a flower is said to be bisexual flower? 
Answer: When a flower has both stamen and pistil, it is called bisexual flower. 

6.Name any three ways by which seeds are dispersed. 
Answer: Three ways in which seeds are dispersed are:-
(I) By wind (II) By water (III) By animals. 

E. Answer the following questions. 
1. In what ways is vegetative propagation better than sexual reproduction . 
Answer- •Vegetative propagation takes less time of produce new plants.
•Differently coloured flowers can be obtained. 
•Purity of breed can be maintained by vegetative propagation. 

2.Draw a well labelled diagram to describe the parts of flower. 
Answer: See page of your book. 

3.How is self pollination different from cross pollination? 
Answer- 

4.How fruits are formed? 
Answer: After fertilization, petals and sepals usually fall off. Ovary develops into a fruit, so that nutrition can be provided to growing seeds. 

5. Why is dispersal of seeds necessary for growth of plants? 
Answer: If all the seeds would fall near the parent plant and germinate, there would be too many plantlets in a smaller area. The plantlets shall not be able to get adequate amount of sunlight, oxygen, moisture etc. As a result, most of the plants would not survive. Hence, it is important that new plants grow up far away from the parent plants and for this seed dispersal is very important. 

VALUE BASED QUESTION
Madam Anshita, a highly respected teacher, in a school for differently abled students, is a very hardworking dedicated and disciplined teacher. She has a lot of sympathy for her students. She uses different teaching methods as per the needs and requirements of her namy differently abled students. She often says that her approach is guided by nature which also uses different methods for dispersal of seeds of different types of plants. 

1. State the values that have made Madam Anshita a highly respected teacher. 
Answer-Care for differently abled students and innovation in teaching methods. 

2.Name the different  methods that nature uses for dispersal of seeds. Give one example of each. 
Answer- Methods of seed dispersal    Example
               By wind                                                  Dandelion
               By water                                                  Water lily
               By animals                                             Jamun
               By bursting                                            Okra


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