Biology Question

1. Bone digestors or osteoclasts are rich in  a) lysosomes b) vacuole c) Golgi complex d) E.R. 2. The smallest living cells with the cell wall are  a) viriods b) protista c) mycoplasma d) bacteria 3. Microtubules are the constituents of a) cilia,flagella and peroxisomes b) spindle fibres,centrioles and cilia c) centrioles, spindle fibres and chromatin d) centrosome,nucleosome and centrioles 4. Mitochondria and chloroplast are i) semi-autonomous organelles ii) formed by division of pre existing organelles and they contain DNA but lack protein synthesising machinery. a) both are correct b) i is true but ii is false c) ii is true but i is false d) both are false 5. The spherical head of the oxysome is  a) dictyosome b) F1 subunit c) F0 subunit d) granum

1.In human males, the testes lie in the scrotum, because it helps in the (a) process of mating (b) formation of sperms (c) easy transfer of gametes (d) secretion of estrogen 2. Which among the following diseases is not sexually transmitted? (a) Syphyllis (b) Hepatitis (c) HIV-AIDS (d) Gonorrhea 3. Which of the following method of contraception protects from acquiring sexually transmitted diseases? (a) Surgery (b) Condoms (c) Copper-T (d) Oral-pills 4. The embryo in humans gets nutrition from the mother’s blood with the help of a special tissue called (a) Placenta (b) Villi (c) Uterus (d) Womb 5. Along the path of the vas-deferens the secretions of which gland provide nutrition to the sperms? (a) Prostate glands (b) Seminal vesicles (c) Scrotum (d) Urinary bladder 6. In human beings, the fertilization occurs in the (a) uterus (b) ovaries (c) fallopian tubes (d) vagina 7. The period during adolescence when the reproductive tissues begin to mature is called (a) ovyfetion (b) puberty (c) ...

1.Write four differences between prokaryotic and eukaryotic cells. 2. What will happen if cell is arrested at meiosis during gamete formation? 3. Write two similarities and two dissimilarities between mitochondria and plastids. 4. Why is salt added to raw fruits and vegetables before making pickles? 5. Write four functions of endoplasmic reticulum.

1.Define health, acute disease, chronic disease, infectious disease, communicable and non communicable disease. 2. Why are different types of medicines used to cure diseases?  3. What happens in the body when someone suffers from a disease?  4. Differentiate between acute and chronic disease.  5. In a village, having poor sanitary conditions, chances of spreading of cholera are more. Justify the statement.  6. Explain by examples that signs and symptoms of a disease depends on the way the microbe infects.  7. In a natural calamity you want to help the needy. Suggest four ways you have thought of for helping them.  8. What are the symptoms shown by a person whose stomach is infected?  9. What are the three limitations for the approach to deal with infectious disease?  10. List six basic conditions for good health. 

1.Which of the following events in the mouth cavity will be affected if salivary amylase is lacking in the saliva? (a) Starch breaking down into sugars. (b) Proteins breaking down into amino acids. (c) Absorption of vitamins. (d) Fats breaking down into fatty acids and glycerol. 2.Which among the following is a unicellular organism that reproduces by budding: (a) Hydra (b) Planaria (c) Yeast (d) Spirogyra 3.Which among the following does not reproduce by spore formation: (a) Penicillium fungus (b) Yeast fungus (c) Mucor fungus (d) Rhizopus fungus 4. The rapid spreading of bread mould on slices of bread are due to: (i) Presence of large number of spores in air (ii) Presence of large number of thread-like branched hyphae (iii) Presence of moisture and nutrients (iv) Formation of round shaped sporangia (a) (i) and (iii) (b) (ii) and (iv) (c) (i) and (ii) (d) (iii) and (iv) 5. The asexual reproduction in the Spirogyra involves: (a) Breaking up of filaments into smaller bits (b) Division of...

1. Plant cells are more rigid than animal cells. 2. Cells are the basic structural unit of living organisms.  3. Tomatoes are red in colour.  4. More mitochondria is present in cells engaged in more physiological activities.  5. Nucleus is control centre of cell.  6. Mitochondria is powerhouse of the cell. 7. Plastids are found only in plant cells. 8. Plant cells have big vacoules. 9. Shape of the cells differ in multicellular organisms. 10. The cells remained undiscovered for a long time. 

1. To make a colourful collage of forest products. 2.  To plant trees on ocassion of Vanmahotsav.  3. To make a food chain with the help of paper, beads, strings etc.  4. Collect various types of Seeds of plants.  5. Observe seed germination in gram seed.  6. Make a food pyramid.  7. Show bread mould on bread and discuss how it is formed and how can it be prevented.  8. Prepare a chart of vitamins, deficiency diseases and their symptoms.  9. Make a model of respiratory system.  10. Use clay to make a model of eye.  11. Collect pics of different food items and classify them as proteins, carbohydrates and fats and prepare a wall magazine.