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.
(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 

(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]

(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

 (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

(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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