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Types	Mitosis	Meiosis
Interphase	Interphase – Chromosomes not yet visible but DNA has been duplicated or replicated.	Each chromosome replicates. The result is two genetically identical sister chromatids
Prophase	Prophase –Each of the duplicated chromosomes appears as two identical or equal sister chromatids, The mitotic spindle begins to form. Chromosomes condense and thicken	Prophase I – Crossing-over recombination – Homologous chromosomes (each consists of two sister chromatids) appear together as pairs. Tetrad is the structure that is formed. Segments of chromosomes are exchanged between non-sister chromatids at crossover points known as chiasmata (= crossing-over)
Metaphase	Metaphase -The chromosomes assemble at the equator at the metaphase plate	Metaphase I Chromosomes adjust on the metaphase plate. Chromosomes are still intact and arranged as pairs of homologues
Anaphase	Anaphase – The spindle fibres begin to contract. This starts to pull the sister chromatids apart. At the end of anaphase, a complete set of daughter chromosomes is found each pole.	Anaphase I Sister chromatids stay intact. But homologous chromosomes drift to opposite or reverse poles.
Types of Reproduction	Sexual	Asexual
Occurs in	Humans, animals, plants, fungi.	All Organisms
Function	Genetic diversity through sexual reproduction.	General growth and cell reproduction, repair of the body.

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The smell of hot seazling food reaches you several metres away but to get the smell from cold food you have to go close. Give reason

Posted by Thota Jahnavi 6 years, 5 months ago

CBSE > Class 09 > Science

3 answers

45516111? 46 6 years, 5 months ago

Becauseof diffusion hot smell release by hot food spread rapidly ..in comparison to cold food

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Akash Panchal 6 years, 5 months ago

Due to the strong kinetic energy of food particles

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Yogita Ingle 6 years, 5 months ago

The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close because the kinetic energy of the particles of matter increases with the increase in temperature.

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what are the ch .aracteristics of the particals of matter?

Posted by Aagam Jain 6 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Ayush Baranwal 6 years, 5 months ago

There are four characteristics of matter- 1.The particals of matter is very very small. 2.The particles of matter have spaces between them. 3.The particles of matter are continuosly moving. 4.The particles of matter attract each other

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Ankita Kushwaha 6 years, 5 months ago

There are four particles of matter: 1. Particles of matter are very small 2. Particles of matter are continuosly moving 3. Particles of matter have spaces b\w them 4. Particles of matter attract each other

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Yogita Ingle 6 years, 5 months ago

The important characteristics of particles of matter are the following:

The particles of matter are very, very small.
The particles of matter have space between them.
The particles of matter are constantly moving.
The particles of matter attract each other.

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ANSWER

Draw a flowchart of practices followed for improvement in crop resources.

Posted by Karan Pal 6 years, 5 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Can the displacemaent of an object can be zero

Posted by Soham Dash 6 years, 5 months ago

CBSE > Class 09 > Science

7 answers

Isha Gupta 6 years, 5 months ago

Yes displacement can be zero, negative and positive

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45516111? 46 6 years, 5 months ago

Yes

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Akash Panchal 6 years, 5 months ago

Yes

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Sheetal Wagh 6 years, 5 months ago

Yes displacement can be zero as well as displacement can be negative

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Suram Bapureddy 6 years, 5 months ago

Yes because if we again reached initial point displacement zero

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Kritika Singh 6 years, 5 months ago

Yes

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Yogita Ingle 6 years, 5 months ago

Distance is defined as the actual distance traveled by a body irrespective of the direction.
Displacement is defined as the distance between the final and the initial point.
So, displacement of an object can not be zero.

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Define meristematic tissue and give their characteristic

Posted by Geeta Gill 6 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 6 years, 5 months ago

Meristematic tissues contain living cells with varied shapes. They possess a large nucleus devoid of the vacuole. The cells have no intercellular space. The size of the cells is very small and can divide effectively.

Characteristics of Meristematic Tissue

The characteristics of meristematic tissue are as follows:

The cells of the meristematic tissue are commonly called meristems.
The cells of the meristematic tissue have the quality of self-renewal. Every time the cell divides, one cell remains identical to the parent cell and the others form specialized structures.
They have very small and few vacuoles.
They are living and thin-walled.
The protoplasm of the cells is very dense.
The meristematic cells heal the wounds of an injured plant.
The cells of the meristematic tissues are young and immature.

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What is a salt solution?

Posted by Laurina Dias 6 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Kritika Singh 6 years, 5 months ago

Mixture of water and salt

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Saurabh Kumar 6 years, 5 months ago

Mixture of salt and water

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ANSWER

Draw/paste pictures of freshwater, brackish water and seawater fishes .

Posted by Karan Pal 6 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Palak Arora 6 years, 5 months ago

U can search on Google

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Explain composite fish culture?

Posted by Karan Pal 6 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Karan Pal 6 years, 5 months ago

Thanks

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Sia ? 6 years, 5 months ago

Composite fish culture is a system in which five or six different species of fishes are grown together in a single fishpond. Fishes with different food habitats are chosen so that they do not compete for food among themselves. This ensures complete utilization of food resources in the pond.

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why is significance of cytoplasm in a eukaryotic cell ?

Posted by Kajal Chauhan 6 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 6 years, 5 months ago

If the eukaryotic cell is capable of photosynthetic activity, then chlorophyll containing organelles known as chloroplasts are also present. The cytoplasm of eukaryotic cells also functions to transport dissolved nutrients around the cell and move waste material out of the cell.

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What are glands and its type with example

Posted by Samriddha Sirsant 6 years, 5 months ago

CBSE > Class 09 > Science

2 answers

45516111? 46 6 years, 5 months ago

Two types of glands endocrine gland , exocrine glands

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Yogita Ingle 6 years, 5 months ago

Exocrine glands are the glands that secrete its product into a duct. For example salivary gland secretes the saliva into the salivary duct.

Endocrine glands are the glands that secrete its product directly into blood. There are no ducts in endocrine glands. The chemical substance secreted by endocrine glands is called hormone. These hormones travel through blood and act on the concerned body part. Hormones are a kind of chemical messengers.

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Why is evaporation called surface phenomenon

Posted by Siddarth Angadi 6 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Palak Arora 6 years, 5 months ago

Because it occurs on surface molecules

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Kriyansh Mehra 6 years, 5 months ago

Because the surface phenomenon is evaporated the surface

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What is kentic energy and potential energy?

Posted by Rajendra Bain 6 years, 5 months ago

CBSE > Class 09 > Science

3 answers

45516111? 46 6 years, 5 months ago

Kinetic energy in moving ,, potential energy in rest

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Gaurav Seth 6 years, 5 months ago

Kinetic energy: Energy possessed by a body by virtue of its motion is called its kinetic energy.

Mathematically, kinetic energy is expressed as,

K.E =

where,

m is the mass of the moving body,
v is the velocity of the body.

Potential energy: Energy possessed by a body by virtue of its position or shape is called its potential energy.

For a body of mass m lying at a height h above the ground level, gravitaional potential energy is given by,

P.E = mgh

Given,

Mass of the body, m = 40 kg
Velocity of the body, v = 15 m/s

So, K. E. = 1 mv² = 1 x 40 x (15)² = 4500 J.
2 2

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Sreya Rajesh 6 years, 5 months ago

Kinetic energy is the energy possessed due to motion

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Write difference between a plant and animal cell with diagram

Posted by Rakhi Gupta 6 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Samriddha Sirsant 6 years, 5 months ago

Difference is that plant cell have cell wall and a function of vacuole it also have plastids

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A bullet is fired with a speed of 50 m/sec.after penetrating in woodden block it comes to rest in one second . Calculate tge thickness of the wooden block

Posted by Aditya Sehal 6 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Samriddha Sirsant 6 years, 5 months ago

a = v-u/t is the acceleration so a= -50m/s So by 3 equation of motion S= ut + half at square S = 50 * 1 + 1/2 -50 * 1 S = 25 m

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ANSWER

Defferent Between prokaryotic cells or eukaryotic cells

Posted by Arnav Singh 6 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 6 years, 5 months ago

	Prokaryotes	Eukaryotes
Type of Cell	Always unicellular	Unicellular and multi-cellular
Cell size	Ranges in size from 0.2 μm – 2.0 μm in diameter	Size ranges from 10 μm – 100 μm in diameter
Cell wall	Usually present; chemically complex in nature	When present, chemically simple in nature
Nucleus	Absent	Present
Ribosomes	Present. Smaller in size and spherical in shape	Present. Comparatively larger in size and linear in shape
DNA arrangement	Circular	Linear
Mitochondria	Absent	Present
Cytoplasm	Present, but cell organelles absent	Present, cell organelles present
Endoplasmic reticulum	Absent	Present
Plasmids	Present	Very rarely found in eukaryotes
Ribosome	Small ribosomes	Large ribosomes

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Aditya Sehal 6 years, 5 months ago

Pro karyotic cell - it doesnt have well developed nucleus here pro means primitive and karyiotic means nucleus . Size of the prokaryotic cell is relatevely large than eukaryotic cell.membrane bound cell organelles are absent Eukaryotic cell - it have well developed nucleus .here eu means new and karyot means nucleus.size of eukaryotic cell is smaller than the size of eukaryotic cell . Membrane bound cell organelles are present

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A gas jar containing air placed upside down on a gas jar of bromine vapours. It is observed that after sometimes, the gas jar containing air also becomes completely reddish brown. a) Explain why this happens. b) Name the process involved

Posted by M. D. Navab Boy 6 years, 5 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Why matter qround us are in different states

Posted by Krishna Myatra 6 years, 5 months ago

CBSE > Class 09 > Science

2 answers

45516111? 46 6 years, 5 months ago

Because variation of characteristics of particles of matter

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Jiya Patel 6 years, 5 months ago

Because the are light in wait

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ANSWER

Speed draw distance-time graph

Posted by M. D. Navab Boy 6 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 6 years, 5 months ago

Position – time

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The displacment of a moving object in a given interval of time is zero. Would the distance travalled by the object also be zero? Justify your answer.

Posted by M. D. Navab Boy 6 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Samriddha Sirsant 6 years, 5 months ago

No because the distance is the total path covered it cant be zero

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Who discover cell and how

Posted by Brahmi Singh 6 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Sreya Rajesh 6 years, 5 months ago

Robert Hooke discovered the cell. While examining a thin slice of cork,RobertHooke saw that the cork resembled the structure of a honeycomb consisting of many little compartments .Robert Hooke called these compartments as cells

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Aditya Sehal 6 years, 5 months ago

Robert hooke discovered dead cell by seeing a dead cell of bark of a tree which is like honey comb structure under primitive microscope

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Kritika Singh 6 years, 5 months ago

Robert hooke in the year 1665

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ANSWER

Arrange the following in order of incresing density-air, exhaust from chimneys, honey,water,chalk,cotton and iron

Posted by Deekshit Naik 6 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Isha Gupta 6 years, 5 months ago

Air<exhaust from chimneys< cotton <chalk <water <honey <iron

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Rajendra Bain 6 years, 5 months ago

In which way to arrange and in which classification to arrange

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Derive equation of motion by graphical methed

Posted by M. D. Navab Boy 6 years, 5 months ago

CBSE > Class 09 > Science

3 answers

M. D. Navab Boy 6 years, 5 months ago

School ki note book me bhi he?

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M. D. Navab Boy 6 years, 5 months ago

Thanks

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45516111? 46 6 years, 5 months ago

Helping book me diya h

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Why lysomes called sucidal bag

Posted by Deepti Dublish 6 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Aditya Sehal 6 years, 5 months ago

Because it contains digestive enzymes and when they burst due to metabolic activities they digest their own cell so they are known as sucidal bags of cell

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45516111? 46 6 years, 5 months ago

Because they are capable to digest the whole cell

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Give me all the formulas of chapter motion . Plz

Posted by Kritika Singh 6 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Aditya Sehal 6 years, 5 months ago

V = u+at .... V^2 = u^2 + 2as .......s=ut + 1/2 at^2....... H max = u^2/2g ..........total time of flight = 2U/g .........time of ascent = u/g and time of descent = u/g

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45516111? 46 6 years, 5 months ago

s=d/t,, a=v-u/t,,, v=u+at,,,, s=ut+1/2at square,,,,,,, 2as=v square -u square,,,,, Average speed= total distance/total time taken ,,,,,,

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Why do organisms neeb to take food

Posted by Raj Yadav 6 years, 5 months ago

CBSE > Class 09 > Science