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Sunday, December 7, 2014

Ch-Our Universe - Solved Question Basic science class 8 Bharati Bhawan Publication

Trend Setter Basic Science Publication - Bharati Bhawan Solutions

Very Short Answer type Questions

A1.Is light year a unit of time or distance? Define `1 light year?

Ans: Light year is a unit of distance .one light year is a distance covered by light in 1 year.

A2.What is the source of stars energy?


Ans: The source of stars energy is nuclear fusion in which hydrogen atoms split up into helium atoms and large amount of energy is librated.

A3.What gives galaxies different shapes? Name a few common shapes of galaxies.


Ans: The arrangement of stars gives galaxies different shapes of galaxies. About 100 billians galaxies in the universe some of them are in shape of spiral, ring like or elliptical.

A4.What is the big Dipper?


Ans: The seven brightest stars in between the month of February and may form a shape of dipper in northern sky. This constellation  is called Big deeper or Saptarshi.

A5. Why are Mercury venues, and Mars called terrestrial planets?


Ans: This is because they are closest to sun and rocky like earth.

A 6. Name the planet which have ring around them?


Ans: Saturn, Jupiter , Uranus and Neptune 

A7. What is the huge spot on Jupiter?


Ans: This spots are actually  a huge storm, which has been ranging on Jupiter for more than 300 years

A8. Name two dwarf planets?Ans: Ceres and Eris

A9. How do dwarf planets different from other planets?


Ans: dwarf planets are not able to pull in the object (gravitational force) near its orbit at the time of its formation

A10.Why do scientists think that Mars had liquid water in the past?


Ans: Scientists think that Mars had liquid water in the past as the channels visible on its surfaces.

Short Answer type Questions

B1. What re the difference between stars and planets?
Ans:

Stars are:          a. luminous                   b. Stationary

Planets are :      a. Non luminous            b. Movable

B2. What re the difference between galaxy and constellation?


Ans: (i) The first difference is that a galaxy is a collection of billions of stars whereas a constellation is a collection of only a very few stars.

 (ii) The second difference is that a galaxy does not form a definite pattern which resembles the shape of an animal or a human being but a constellation appears to resemble an animal or human being  in its shape

B3. What are the asteroids?      


Answer: There is a large gap in between the orbits of the Mars and Jupiter. This gap is occupied by a large number of small bodies that revolve around the sun. These are called asteroids

B.4.What is meteorites? In which bodies are meteorites craters more commonly found and why?


Ans: meteorites are rocky bodies revolving around the sun. Large meteors when hit the surface of planet create craters. Meteorites craters more commonly found on those planets and moon which have no or little atmosphere to burn off the falling rocks. E.g. Moon and mercury.

B5. What is comet? How is its tail formed?


Ans:  Comet is small body of ice and dust revolving around the sun in its elongated orbit. When comet approaches the sun, it heats up and leaves behind a stream of hot glowing gases and dust particles. We see it as a tail. 

B6. Why does geostationary satellite seem fixed above a point on the earth?


Ans: A satellite placed at about 3600 km above the equator completes one revolution around the sun in 24 hrs . This makes its position fixed above a point on the earth               

More solved question Trend Setter


VIII Stars and The Solar System (Physics) Formative and Summative Assessments

Friday, December 5, 2014

9th Animal kingdom- Diversity of living organism


Animal kingdom: It consists of organisms which are eukaryotic, multicellular and heterotrophic. Their ells do not have cell-walls. Most animals are mobile.

Animal kingdom classified on the basis of the following points: Arrangement of cells, body symmetry, nature of coelom, patterns of digestive, circulatory or reproductive systems


KINGDOM ANIMALIA

Animalia  are further classified as Non- Chordates( Porifera, Coelenterata, Platyhelminthes , Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata) and Chordates { Protochordata, Vertebrata ( Pisces, Amphibians, Reptilia, Aves, Mammalia)}

Non- Chordates 

Porifera: Organisms of this group have holes or ‘pores’, all over the body and therefore known as sponges. They are mainly found in marine habitats Pores helps in circulating water throughout the body to bring in food oxygen and removal of waste. They are hermaphrodite i.e., eggs and sperms are produced by the same individual. Sponges reproduce asexually by fragmentation and sexually by formation of gametes. Fertilisation is internal . They are primitive multicellular animals and have cellular level of organisation. Sponges have a water .

Examples of Porifera : (a) Sycon (b) Euspongia (c) Spongilla

Coelenterata: They are aquatic, mostly marine and radically symmetrical. They have tissue level of organisation. They are diploblastic i.e he body is made of two layers of cells: one makes up cells on the outside of the body (ectoderm) , and the other makes the inner lining of the body(endoderm). They exhibit tissue level of organization.

Some of these species live in colonies (corals), while others have a solitary like–span (Hydra). Jellyfish and sea anemones are common examples.


Platyhelminthes: The body is bilaterally symmetrical, meaning that the left and the right halves of the body have the same design. There are three layers of cells from which differentiated tissues can be made (triploblastic).

There is no true internal body cavity or coelom, in which welldeveloped organs can be accommodated. The body is flattened dorsiventrally, meaning from top to bottom, which is why these animals are called flatworms. They are either freeliving or parasitic. Some examples are freeliving animals like planarians, or parasitic animals like liverflukes. Fertilisation is internal.

Nematoda: They bilaterally symmetrical and triploblastic. The body is cylindrical rather than flattened. There are tissues, but no real organs, although a sort of body cavity or a pseudocoelom, is present. some of them are parasitic like round worms or pin worm and other are living in soil and water like rhabditis.



Annelid animals : are bilaterally symmetrical and  segmented. There is an open circulatory  system, and so the blood does not flow in well defined  blood vessels. The coelomic cavity is blood-filled. They have jointed legs (the word ‘arthropod’ means ‘jointed legs’). Some familiar examples are prawns, butterflies, houseflies, spiders, scorpions and crabs


Arthropoda: The word Arthropoda “means organisms with jointed legs” They are bilaterally symmetrical Triploblastic(three layers of cells ), familiar with cockroaches. The Coelom is blood filled called as Haemo Coelom. Ex. Prawn, Scorpion, Housefly


 Mollusca: The word Mollusca “means organisms with soft body” They are bilaterally symmetrical, Triploblastic(three layers of cells), familiar with Octopus, Pila. Foot is for moving, kidney like organ for excretion, with open circulatory system. Ex. Unio, chiton

Echinodermata: The word Echinodermata “means organisms with spiny skinned”. Exoskeleton is with calcium carbonate. They are radially symmetrical Triploblastic ( three layers of cells ) with coelomic cavity, familiar with Star fish. They are exclusively free-living marine animals. Ex. Sea Cucumber, Feather Star

Chordates: They are further classified as two major groups such as Protochordata& Vertebrata

(A).Protochordata: Notochord present in at least larval forms, but very rudimentary. It is a rod like supporting structure, runs along with nervous tissue from the gut of animal. They  are bilaterally symmetrical, triploblastc(three layers of cells) with a Coelom, familiar with Amphioxus. Ex. Balanoglossus

(B).Vertebrata: Notochord is replaced by vertebral column and internal skeleton. They are bilaterally symmetrical, triploblastic, coelomic and segmented having paired gill pouches.

Vertebrates are grouped into five classes.

Pisces: These are commonly called as “fishes”, exclusively aquatic. Body is streamlined and a tail for locomotion. Gills for respiration, heart is two chambered, cold blooded, skin is covered with scales, plates. They are cold-blooded animals. Skeleton of bone ( Rohu) / cartilage( Shark). They lay eggs. Ex. Lion Fish, Dog Fish

Amphibians: These are commonly called as “Amphibians” because they can live on land and in water”. Body is streamlined and a webbed foot/ foot for locomotion. Gills or lungs or skin for respiration, heart is three chambered, cold blooded, skin is lack of scales, plates. They are cold-blooded animals. They lay eggs. Ex. Rana, Hyla


Reptilia: These are commonly called as “Reptilians”. A lung for respiration, heart is three chambered (Crocodile heart is four chambered), skin have scales. They are cold-blooded animals. They lay eggs. Ex. Snakes, Turtles (Please refer Fig. 7.23, NCERT Text Book Page- 93).

Aves :These are commonly called as “Birds”. A lung for respiration, heart is four chambered, fore limbs are modified for flight, skin has feathers. They are warm-blooded animals. They lay eggs. Ex. Ostrich (Flightless Bird), Pigeon, Sparrow


Mammalia: These are commonly called as “animals with mammary glands for producing milk to nourish their young ones”. A lung for respiration, heart is four chambered, skin has hairs, sweat or oil glands. They are warm-blooded animals. They lay eggs (Platypus, Echidna), give birth to young ones poorly developed (Kangaroo) & give birth to developed  young ones (Human beings). Ex. Lion, Whale,

DETAILS OF NOMENCLATURE

NOMENCLATURE: The system of scientific naming or nomenclature was introduced by Carolus Linnaeus. It is unique to identify in the world. We limit ourselves to writing the names of the Genus and Species of that particular organism. The world over, it has been agreed that both these names will be used in Latin forms.When printed is given in italics and when written by hand, the Genus and Species name have to be underlined separately.

Ex. Ostrich (Common name): Struthiocamelus(scientific name with two parts namely the Genus and Species).

Key terms:

Any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry.

The body can be divided into identical left and right halves in only one plane, exhibit bilateral symmetry .

Animals in which the cells are arranged in two embryonic layers, an external ectoderm and an internal endoderm, are called diploblastic animals.

Animals in which the developing embryo has a third germinal layer, mesoderm, in between the ectoderm and endoderm, are called triploblastic animals

The body cavity, which is lined by mesoderm is called coelom. Animals possessing coelom are called coelomates, e.g., annelids, molluscs, arthropods, echinoderms, hemichordates and chordates.

The body cavity which is not lined by mesoderm, instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm. Such a body cavity is called pseudocoelom and the animals possessing them are called pseudocoelomates, e.g., aschelminthes. 

The animals in which the body cavity is absent are called acoelomates, e.g., platyhelminthes. 
You may use :

Diversity in Living Organisms class 9 solved more than 150 Questions for CBSE exam

Class IX Science Ch-07 Diversity in Living Organisms Previous year Solved Questions

Biology class IX Ch-07. Diversity in Living Organisms

Oswal Question Bank Diversity in Living Organisms Download File

Class IX Science Ch-07 Diversity in Living Organisms Previous year Solved Questions

Diversity in Living Organisms solved CBSE Paper-1
Diversity in Living Organisms solved CBSE Paper-2
Diversity in Living Organisms solved CBSE Paper-3
Diversity in Living Organisms solved CBSE Paper-4
Diversity in Living Organisms NCERT Solution
9th Diversity in Living Organisms Study Notes
9th 9th Diversity in Living World Notes                                   Download File

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Thursday, December 4, 2014

CBSE Board Exam 2015 : Class 10 and 12 exam Date Sheet

Central board secondary educational department is going to organize the annual exam for the appearing students of Intermediate and High schools classes. Download CBSE date sheet 2015 and check out the examination dates.  CBSE Date Sheet 2015

Sunday, November 30, 2014

Diversity in Living Organisms Solved Questions class 9

Plants Kingdom          

Question: 1. Why do we classify organisms?  

Answer:- we classify organisms to understand characteristics of life form on the earth.

Question: 2. Give three examples of the range of variations that you see in life forms around you.
·     
Answer:- Three examples of the range of variations in life forms:
·         Bacteria is microscopic where as Red wood tree is giant
·         pine trees live for years where as mosquito for few days
·         Variety of flower having different colors

Question: 3. which do you think is a more basic characteristic for classifying organisms?
(a) The place where they live.   (b) The kind of cells they are made of. Why?

Answer: The kind of cells an organism is made of is more basic characteristic of classifying organism because form and function depends on cell

Question :- 4. What is the primary characteristic on which the first division of organisms is made?

Answer: Habitat.

Question: 5. (a) On what bases are plants and animals put into different categories?            
(b) What is the basis on which living things are identified and categorized?

Answer: (a) Body design and mode and source of nutrition  (b) On the basis of structure, mode and source of nutrition and body organization

Question: 6. which organisms are called primitive and how are they different from the so-called advanced organisms?

Answer: Groups of organisms which have ancient body designs and do not have not changed very much yet is called primitive. On the other hand, an organism acquired their particular body designs recently is called advanced.

Question: 7. (a) Will advanced organisms be the same as complex organisms? Why?
(b) How can we say that the classification of life forms will be closely related to their evolution ?      
Answer: 
(a) No, this is because there is a possibility that complexity in design will increase over evolutionary time
(b) As the characteristics that have come into existence earlier are likely to be more basic than characteristics that have come into existent latter.

Question: 8.What is the criterion for classification of organisms as belonging to kingdom Monera or Protista?

Answer: Organisms which are prokaryotes belong to the kingdom Monera and organism which are eukaryotes and unicellular belong to the kingdom Protista.

Question: 9. In which kingdom will you place an organism which is single-celled, eukaryotic and photosynthetic?

Answer: Protista

Question: 10. In the hierarchy of classification, which grouping will have the smallest number of organisms with a maximum of characteristics in common and which will have the largest number of organisms?

Answer: Kingdom will have the most number of organisms
Species will have the least number of organisms.

Question: 11. Which division among plants has the simplest organisms?

Answer: Thallophytic

Question: 12. How are pteridophytes different from the phanerogams?         
  
Answer: In pteridophytes, the reproductive organs are hidden and they do not produce seeds. In phaenrogams, reproductive organs are conspicuous[clearly visible.] and they produce seeds.

Question: 13. (a)How do gymnosperms and angiosperms differ from each other
(b) What are the differences between monocots and dicots?    

Answer: (a) Gymnosperms bear naked seeds and do not bear flowers eg. pines and deodar. Angiosperm have covered seeds and bear flower eg. pines and deodar

(b) Monocots produce one leaf[cotyledons] from the seed after germinating eg.Paphiopedilum
Dicots produce two. Monocots produce parallel leaf veins; Decocts produce a net-like display of veins. e.g. Ipomoea

Question: 15. What is evolution ? Who first of all gave the idea of evolution ?

Answer: All life forms that we see today have arisen by an accumulation of changes in body design that allow the organism possessing them to survive better is called evolution Charles Darwin first described this idea of evolution in 1859 in his book, The Origin of Species

Question: 16. State the name of scientist who proposed five kingdom classification systems of organisms.

Ans: Robert Whittaker in 1969 on the basis of (i) cell structure (ii) mode and source of nutrition and
(iii) body organization.

Kingdom
Types of Organisms
Monera
Bacteria and Cyanobacteria.
Protista
Unicellular organisms.
Plantae
All photosynthetic green plants.
Fungi
Lack chlorophyll and obtain their food through absorption.
Plantae
All multicellular photosynthetic green plants.
Animalia
Multicellular hetrotrophs

Question.17. Who proposed division of Monera kingdom? State the groups proposed

Answer: Carl Woese.  The groups are – (i) Archaebacteria or Archaea  (ii) Eubacteria or Bacteria.

Question:  18. (a) Define species.
                     (b) State the hierarchic categories generally used for classification of animals.

Answer: (a) All organism that are similar enough to inter breed  is called species.
               (b) The characteristics dependent on the previous one and would decide the variety in the next level should be chosen for developing a hierarchy in classification.

The hierarchic categories generally used for classification of animals

(i) Kingdom – Plant kingdom and animal kingdom.
(ii) Phylum (for animals)/Division (for plants) – Group of closely related classes having certain common characters.
(iii) Class – Group of closely related orders having certain common characters.
(iv) Order – Group of closely related families with certain common characters.
(v) Family – Group of closely related genus with certain common characters.
(vi) Genus – Group of closely related species with certain common characters.
(vii) Species – Group of organisms similar enough to breed and perpetuate.

Question:  19. Why blue green algae are included under monera and not under plantae ?

Ans: (i) Nuclear material is not enclosed with nuclear membrane and cell organelles are also not enclosed with membrane. (ii) Do not show multicellular body design.

Question:  20. State the groups of organism under kingdom monera.

Ans: (i) Bacteria               (ii) Cyanobacteria                 (iii) Mycoplasm.

Question:  21. What are mycoplasm ?

Answer: Mycoplasms are the smallest and the simplest organisms. They have nucleoid and their body can change shape easily. They are heterotrophs.

Question:  22.Why do bryophytes are called amphibians of the plant kingdom ?

Answer: Bryophytes are also called amphibians of the plant kingdom because they can live on soil but need water for sexual reproduction. They are usually found in damp, humid and shaded localities.

Question:  23. what are the contribution of Ernst Haeckel in biology?

Ans: Haeckel provide a reasonable pictures of how multicellular organisms evolved.

Question:  24.  What are the important characteristics of the five kingdoms of Whittaker ?
The Five Kingdoms
MONERANS
One Cell
No Nucleus
No Organelles
Some Cell Wall
Food
Make Food
Absorb Food
   Ingest Food

Movement
Water
Host
Reproduction
Fission

Examples

Bacteria
  
PROTISTS
Most One Cell
Some Many Cell
Nucleus
Organelles
Some Cell Wall
Food
Make Food
Absorb Food
Ingest Food
Movement
Pseudopodium
Cilia
Flagella
Reproduction
Fission
Asexual
Sexual
Examples
Plankton
Algae
Amoeba
Paramecium
Diatoms
Euglena
Volvox

FUNGI
Some One Cell
  Some Many Cell
Nucleus
Organelles
Cell Wall
Food
Absorb Food
Ingest Food
Movement
Host
Reproduction
Spores
Budding
Examples
Mushrooms
Molds
Mildews
Yeasts
          PLANTS
All Many Cells
Nucleus
Organelles
Cell Wall
Food
All Make Food
  Some Ingest Food
Movement
Grow
Phototropism
Geotropism
Reproduction
Sexual
Asexual
Grafting
Budding
Cuttings
Examples
Mosses
Ferns
Liverworts
Horsetails 

ANIMALS
All Many Cells
Nucleus
Organelles
Food
All Ingests Food
Movement
Muscles
Reproduction
Asexual
Sexual
Examples
Sponges
Worms
Mollusks
Insects
Starfish
Mammals
Amphibians
Fish
Birds
Reptiles



Diversity in Living Organisms solved CBSE Paper-1
Diversity in Living Organisms solved CBSE Paper-2
Diversity in Living Organisms solved CBSE Paper-3
Diversity in Living Organisms solved CBSE Paper-4
Diversity in Living Organisms NCERT Solution
9th Diversity in Living Organisms Study Notes
9th 9th Diversity in Living World Notes                            Download File
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