Class -10th

Subject- Mathematics

Date -13/05/2020

Chapter- Statistic

(Do it in your practice notebook)

*Solve questions from 14.3 exercise NCERT

MD SR. SEC SCHOOL, MANKROLA

CLASS : 10 TH

SUBJECT : SCIENCE (BIOLOGY)

HOME ASSIGNMENTS DATE : 13/05/2020

CHAPTER : 7 HOW DO ORGANISM REPRODUCE

Good Morning students .

Today we will study about different types of vegetative reproduction

and sexual reproduction.

Write these notes in your fair note book.

Vegetative Propagation

A mode of reproduction in which reproduction takes place from the

vegetative parts like the stem, root, leaves.

Methods of Vegetative Propagation

Natural

1. By Roots : E.g. adventitious roots of Dahlias

2. By Stems : E.g. Potato (tuber), ginger (rhizome)

3. By Leaves :E.g. leaves of bryophyllum bear adventitious buds (in the

notches of leaf margin) which develop into new plants.

Artificial

1. Grafting : E.g. Mango.

2. Cutting : E.g. Rose

3. Layering : E.g. Jasmine

4. Tissue adture : E.g. Orchids, Ornamental Plants.

Benefits of Vegetative Propagation

1. Plants can bear flowers, fruits earlier than those produced from seeds.

2. Growing plants like Banana, orange, rose, jasmine that have lost the

capacity to produce seeds.

3. Genetical similarity is maintained in the plants.

4. Helps in growing seedless fruits.

5. Cheaper and easier method of growing plants.

Sexual Reproduction

When reproduction takes place as a result of fusion of two gamets, one

from each parent, it is called sexual reproduction.

The process of fusion of male and female gametes is called

fertilization.

The formation of gamets involves exchange of chromosomal

(genetic)fragments between homologous chromosomes causing

genetic recombination which leads to variation.

Sexual Reproduction in Plants

It occurs mostly in flowering plants. In fact flowers are the reproductive

organ of plants.

FLOWERS

Bisexual Flowers

Both male and female reproductive

part i.e., stamen & carpel are present

& carpel are present. Eg. Hibiscus, mustard

Multiple Fission

The parent cell divides into many

daughter cell simultaneously.

Eg. Plasmodium

A typical flower consists of four main whorls namely calyx (sepals),

Corolla (Petals), Androecium (Stamens) and Gynoecium (Carpels).

Pollen grains of a flower , transfer to the stigma of the carpel of the

same flower (Self-Pollination)or to the stigma of carpel of the

another flower (Cross-Pollination).

This transfer of pollens is achieved by agent like wind, water or

animals.

After Pollination, a pollen tube grows out of pollen grains, through

which male germ cell reaches the ovary and fuses with the female

germ cell.

Fertilization : The fusion of male and female gamete is called

fertilization. It occurs inside the ovary. Zygote is produced in this

process.

OVARY->OVULE->EGG CELL AND POLAR NUCLEI.

Zygote divides several times to form an embryo within the ovule.

The ovule develops a tough coat and is converted into a seed.

Ovary grows rapidly and ripens to forms a fruit, while the seed

contains the future plant or embryo which develops into a seedling

under suitable condition. This process is known as Germination.

Flowers can also be unisexual(contain either stamen or carpel) or

bisexual(contains both stamen and carpel).

Unisexual flowers :PAPAYA ,WATERMELON .Bisexual

flowers:HIBISCUS,MUSTARD.

Class 10 Kritika II – Chapter 1:

1. यह ह ह

, य ह श ण ह झ

ह ह ह ?

ह ह ह ह ह य औ ह ह उ ई उ श य ह श य उ ह ह य ह ह

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ह

4. औ उ य औ औ ह ?

औ उ ह ह | उ , , , , घ - ह ह श ह |

ह ण ह | ह , , , ह- ह य , ह ह | य ह ह ह ह |

5. ण ह ?

Class 10 Kritika II – Chapter 1:

1. ई श

ह ह ह ह यण ई यह ह ह ह औ उ श ई ह ण ह 2. घ घ

उ , उ झ झ ह औ उ य , उ 3. श ह औ औ ह ह य ह

6. उ श श ण ह ण

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ण ह

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8. यह - ह , उ श

ह ह श य उ ह , ह , , य औ उ श ह उ ह ह

ह

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Class 10 Kritika II – Chapter 1:

ह ह ह ह उ ह 9. श उ य ई श झ

ह उ य ह ह

झ य य य ह

ह उ य ह श ह ह उ ह ह ह , ह उ ह ह ह ह य ह श ह उ य य ह , उ : ह , उ

ह ह ह ह य ह ह यह य उ य

ह उ य श औ ह ह ह ह ह

10. - ह ?

− ई ह ह :–

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श ह

4. − ह य ह घ य ह 5. − य 11. य ई ह ह य ह

ह ?

यह ह उ य ह ह

ह ह ह औ उ

उ , , , , य ह . ., ह य ह य , , , ह ह

M.D. SR. SEC. SCHOOL, MANKROLA, GURUGRAM

CLASS-X

HOMEWORK FILE Dated- 13-05-20

ARTICLE-WRITING DIGITAL INDIA

The Government of India to strengthen the digital society and government

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availability of high speed Internet. To provide a digital identity to all citizens of

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Universal access to digital resources: Indian language digital resources /

availability of services also. "Digital Locker" name, the government has

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physical documents, and different agencies to enable the exchange of e-

documents. MyGov.in a partnership between citizens and the government to

establish a new platform which has been implemented.

Digital India, a great contribution from government in the development of the

country.