Biology for ( Grade 10 )

DNA molecules. Endonuclease : Which cleaves the DNA duplex at any point except ends. Restriction endonucleases : Restriction ...

(iii) It can be proved beneficial in case of plants e.g. “nif” gene is transferred in plants which is responsible for N 2 fixati ...

14.4 (b) Structure of DNA : Structure of a DNA molecule (i) It consists of two helical polypeptide chins which are coiled around ...

14.5 SOME IMPORTANT TERMS : Karyotype : In includes the details of the number of chromosomes of an organism, their size and sha ...

Hirudin is a protein that prevents blood clotting. The gene encoding hirudin is chemically synthesized. This is then transferre ...

OBJECTIVE QUESTIONS The main aim of plant breeding is (A) to produce improved varieties (B) to make soil fertile (C) to contro ...

(C) if all plants are tall after self-pollination (D) if all plants are dwarf after self-pollination Allel is the (A) alternat ...

ANSWERS DAILY PRACTIVE PROBLEMS # 13 Que. 1 2 3 4 5 6 7 8 9 10 Ans. A B A D D B A D C D DAILY PRACTICE PROBLEMS # 14 Que. 1 2 3 ...

OUR ENVIRONMENT 15.1 ECOSYSTEM : The term Ecosystem was coined by Tansley. According to him Ecosystem is a symbol of structure ...

ecosystem is called as “cybernetics” 15.1 (a) Types of Ecosystem : Natural (e.g. lake, forest, grassland etc.) or man made (e.g. ...

Ecosystem Biotic component Abiotic component Producers Consumers Decomposers Primary consumers Secondary consumers Top consumers ...

Secondary consumers : Animals which feed upon primary consumers and obtain their food. It means those carnivorous which kill an ...

whereas a few species occur in a desert ecosystem. (ii)Stratification : The organisms in each ecosystem from one or more layers ...

destroyed, but can be transferred from one from to other. (B) Second law : It states, that every energy change involves the degr ...

Food chain in nature (a) in forest , (b) in grassland & (c) in a pond 15.2 (a) Types of food Chain : There are three types o ...

Plant Rat Snake Hawk. Aquatic food chains : Phytoplanktons Zooplanktons Small crustacians Predator insect Small fish Large fish ...

As much as food web complexes are there as much ecosystem is permanent or stable, such type of ecosystem does not degenerate na ...

An ecological pyramid is a graphical representation of an ecological parameter like number of individuals or amount of biomass o ...

Pyramid of number in tee ecosystem Pyramid of number shows biotic potential of an ecosystem. The number of members of any parti ...

obtained energy of each organism is utilized in their various metabolic activities and only 10% energy transferred to the next t ...