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BIOLOGY WORKSHEET 1. Robert Hooks : Robert Brown : : Cells : ? (i) Cytoplasm (ii) Mitochondria (iii) Nucleus (iv) Lysosomes Ans: Nucleus *Scientists who discovered major cell organelles 2. Suicidal bag : power house : : ? : Mitochondria (i) Plastids (ii) Golgi apparatus (iii) Ribosome (iv) Lysosomes Ans: Lysosomes *Functions of cell organelles 3. Leucoplasts : Chromoplasts : : Colourless : ? (i) Coloured (ii) Green (iii) White (iv) Black Ans: Coloured 4. Amoeba : ? : : Unicellular : Multi-cellular (i) Earthworm (ii) Euglena (iii) Paramecium (iv) Bacteria Ans: Earthworm *Concepts related to ‘Diversity in the Living World’ 5. Apical Meristem : Lateral Meristem : : Tips of stem : ? (i) Sides of stem or roots (ii) Base of leaves (iii) Internodes on twinges (iv) Outer covering of epidermis Ans: Sides of stem or roots *Concepts related to ‘Tissues’ 6. Xylem : ? : : transport of water : transport of food (i) Parenchyma (ii) Phloem (iii) Collenchymas (iv) Sclerenchyma Ans: Phloem 7. Malaria is caused by parasite : (i) Salmonella Typhi (ii) Vibro Cholerae (iii) Plasmodium (iv) Bacteria Ans: Plasmodium *‘Microorganisms’ Passage Cell body is the main part of a nerve cell. A large nucleus is present in the middle of the cell body. It also contains cytoplasm. Dendron are hair-like parts arises from the cell body. Various branches come out of the Dendron and these are called dendrites. Each neuron has a long, thick and cylindrical part, which is called axon. The nerve endings attached to the lateral branches of the axon, known as synapse. Dendrites receive impulses and axon takes away from the cell body. 1. What is the main part of nerve cell? (i) Nucleus (ii) Cell body (iii) Cytoplasm (iv) Dendrites Ans: Cell body 2. Name the hair-like part arising from the cell body. (i) Dendron (ii) Axon (iii) Synapse (iv) None of these Ans: Dendron 3. What is the shape of axon? (i) Rectangular (ii) Cylindrical (iii) Circular (iv) Spherical Ans: Cylindrical 4. What is attached to the lateral branch of axon? (i) Nucleus (ii) Axon (iii) Synapse (iv) Dendrites Ans: Synapse --------------------------------------------------------------------------------------------------1.Which of the following is different from the others? i)Snake ii)Lizard iii)Chameleon iv)Earthworm Hint: *Diversity in living world ( members of a particular phylum) The progressive accumulation of toxic chemicals present in pesticides over a period of time is called biomagnification. DDT is a harmful insecticide with very high potential of bioaccumulation and magnification through foodchain. At present its use is not recommended and even banned in a number of countries. Over time , it gradually builds up in foodchain.: insectssmall predatorsbigger predators. Additionally, many insects have acquired chain like resistance against DDT. 1.In which animal concentration of DDT would be greatest? i)grasshopper ii)rodent iii)snake iv)eagle Ans: Eagle( Foodchains) 2.Even after 5 sprays of DDT, Ramakrishnan finds stem borers in his field. What is the most common cause? i)DDt cannot kill stem borers ii)He has applied less DDT iii)Stem borers in field have acquired resistance iv)He has not applied DDT as per schedule Ans: Stem borers in field have acquired resistance ---------------------------------------------------------------------------------------------------Questions 71-75 Pg.114 Question 25 Pg.136