Saturday, October 26, 2013

Biology (Science) Guess Paper Summative Assessment – II, 2014 Class – X

1 mark Questions 1 x 5 = 5
1. Questions: In a food chain consisting of snake, insect, grass and frog, assign an appropriate trophic level to frog.
2. Questions: Producers always occupy the first trophic level in any food chain. Why ?

3. Questions: Name the bacteria responsible for nitrification in nature.
4. Questions: Use of paper bags is more environment friendly than the use of polythene bags for packaging. Justify.

5. Questions: Name any two factors responsible for the formation of soil.

2 marks Questions 2 x 10 =20
6. Questions: Name those parts of a flower which serve the same function as the following do in the animal
(i) Testis (ii) Ovary (iii) Eggs (iv) Sperms

7. Questions: What are fossil fuels ? How are they formed ?

8. Questions: What is ozone ? How does it protect the organisms on the Earth ?

9. Questions: What are sexually transmitted diseases ? Name an STD which damages the immune system of human body ?

10. Questions: Pre - natal sex determination has been prohibited by law. State two reasons.

11. Questions: What is placenta ? State its any two roles during pregnancy.

11. Questions: List any four stakeholders which may help in the conservation of forests

12. Questions: (a) Why are coal and petroleum called fossil fuels ? (b) Name any two elements present in fossil fuels in addition to carbon.

13.Questions: How can we as an individual help in reducing the use of fossil fuels ? Mention two ways.
14.Questions: State in brief two functions of copper - T used by some women.
15.Questions:
(i) Write one main characteristic feature that differentiates Gymnosperms from Angiosperms.
(ii) Give one example of each of a Gymnosperm and an Angiosperm.3 marks 

16.Questions:
(i) Identify the class of animals having the following characteristic features.
a) The warm blooded animals that lay eggs and have four chambered heart and a covering of feathers.
b) The cold blooded animals having scales and they breathe through lungs.
(ii) Give one example of an animal belonging to each of these classes.

17.Questions: Distinguish between analogous organs and homologous organs. Identify the analogous and homologous organs among the following :
Wings of an insect, wings of a bat, forelimbs of frog, forelimbs of human. 1

18.Questions:Explain with the help of flow chart - “What determines the sex of a child genetically”

19. Questions:What is the importance of D.N.A copying in reproduction ? Why is variation beneficial to the species but not necessary for the individual ? Explain.

20.Questions: (a) Are the wings of a butterfly and the wings of a bat analogous organs or homologous organs ? Justify your answer. (b) State the role of father and mother in the determination of sex of new born child. Support your answer with a suitable illustration.

21.Questions: (a) Identify the asexual method of reproduction in each of the following organisms:
(i) rose (ii) yeast (iii) planaria
(b) What is fragmentation ? Name a multhcellular organism which reproduces by this method.

22.Questions: List three groups of plants. Which plants are referred to as vascular plants ? Out of these which group is further classified on the basis of number of cotyledon ? State its two characteristics.

23. Questions: List in the tabular form any three differences between the Aves and the Mammalia group.

24. Questions: 
a) Why taking an antibiotic is not effective in the common cold ?
b) Name two diseases against which infants below one year are vaccinated.
(c) List two symptoms of any one of these diseases.

25.Questions: Draw the labelled diagram of female reproductive system. Name the organ which provides nutrition to embryo? Where is it located?

5 marks

26. Questions:
a) What is the role of seminal vesicles and the prostate gland ? What are the three categories of contraception methods ? Write briefly about each. [2+3]

27.Questions:
(a) Draw longitudinal section of a flower and label on it the following : [2+3 ]
(i) Ovary (ii) Style (iii) Stigma (iv) Anther
(b)Why is vegetative propagation practised for growing some plants ? Give two examples of plants grown by this method.

28. Questions:
(a) Differentiate between germination and fertilization. 2+3
(b) State in brief the functions of the following parts of the human male reproductive system :
(i) Scrotum (ii) Testes (iii) Vas deferens

29.Questions:
 (a) Differentiate between pollen grain and ovule. 2+3
(b) State in brief the functions of the following parts of the human female reproductive system.
(i) Ovary (ii) Fallopian Tube (iii) Uterus

30.Questions:
(a) List two advantages of sexual reproduction over asexual reproduction.5

(b) Name the type of asexual reproduction seen in : (i) Plasmodium (ii) Planaria
(c) Draw a diagram of Rhizopus showing the location of : (i) Sporangium (ii) Rhizoidal hyphae.
(d) How will an organism be benefited if it reproduces through spores ?

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