CBSE ADDA

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 t

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 f

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. Ques