MAHA SAMKALPAM CHITTOOR DISTRICT 2017 SPELL-I X CLASS – BIOLOGICAL SCIENCE Time: 45m Max Marks:25 I. Answer the following in 1-2sentence 4x1=4 1. What happens of salivary ducts are closed. 2. Give examples and explain what is meant by external fertilization. 3. Chorion, placenta, amnion, allantois are the embryonic membranes write their functions in a tabular form. 4. Which hormones are induced the hunger pangs start and end in human digestion? II. Answer the following 3-4 sentence 5x2=10 Ovule - seed - ovule layers - fruit layer - secondary nucleus - x 5. What the x denotes 6. The taste differs when we put a food material in our mouth and we press tongue against the palate why? 7. Nowadays the villages are introduced cement roads pucca buildings, T.V.S Industries in the name of the development. How these new changes will effect the environment? 8. What questions do you prepare to know the meiosis? 9. Which is called second brain why? III. Answer the following 5-8 sentence 2x4=8 10. Write the procedure, observations, results which you have conducted the experiment with bread to observe Rhizophus (or) What experiment should you perform to understand action of saliva on flour Explain it? 11. Explain the process of Fertilization in flowering plants. Write its importance? (or) Give reasons i) We cant identity taste when food is hot? ii) We eat food proper mastication iii) Stomach is structured as a bag rather than like a tube iv) If a person have tension for some reason he start having loose motions PART – B IV. Choose the correct answer A,B,C,D write in your answer 6x1/2=3 12. Identity the parts of the sperm ( ) A. Head, neck, middle part tail B. Head, penus, collar, tail C. Head, Funnel, neck, tail D. Head, seminalveside, Nucleus, tail 13. Why are egg cells larger than sperm cells choose the option you thing right. ( ) A. Egg cells have more cells in themB. Have thicker cell membranes C. Have larger nuclei D. Have food store to help growth 14. This symbol is related to the day ( ) A. 28th February B. 5th June C. 14TH November D. 1st December 15. The region is brain portion that controls hunger signals ( ) A. Medulla B. dienceplon C. Cerebrum D. Mid brain 16. Matching 1. olfactory receptors a. Tongue 2. Taste buds b. Hanger pangs 3. Vagus nerve c. nose A. 1-c, 2-a, 3-b B. 1-a, 2-b, 3-c C. 1-b, 2-a, 3-c D. 1-a, 2-c, 3-b 17. If the chime is pushed forward is small quantity then it reaches to ( ) A. Oesthagus B. Small intestine C. Duodenum D. Large Intestine