Winter break homework
- Revise three chapters :
- Reproduction
- Heredity and Evolution
- Our Environment
- Complete your practical file and submit after winter break.
- Try to attempt the CBSE sample paper questions from the syllabus covered so far..Check the following link- CBSE Science sample paper SA II (2016-17)
- Check your answers here: Marking scheme of sample paper
- Complete the following questions in your notebook.
DAV Public School , Kailash Hills
Class X
Heredity and Evolution & Our environment
Q1. The genotype of green coloured Tomato plants is denoted as GG and that of purple stemmed Tomato plants as gg. When the two are crossed:
a) What colour of stem would you expect in F1 progeny?
b) Give the percentage of purple stemmed plants if F1 are self pollinated.
c) In what ratio would you find the genotypes GG and Gg in the F2 progeny?
Q2.From the list given below, select the character which can be acquired but not inherited
a) Colour of eye b) Colour of skin c) Size of body d) Nature of hair
Q3a)A basket of vegetables contains carrot, spinach, radish, potato, and tomato. Which one of them represent the correct homologous structures and analogous structures?
Q.3b) Which type of similarity , homologous and analogous occurs in the pairs of organs?
a) Forelimbs of bird and bat
b) Wings of bird and bat
c) Forelimbs of horse, Fins of Fish
Q4 What are fossils? How do they tell us about the process of evolution?
Q5.In the given food chain suppose the amount of energy at fourth trophic level is 5kJ, what will be the energy available at the producer level?
Grass Grasshopper Frog Snake Hawk
a) 5kJ b) 50kJ c) 500kJ d) 5000kJ
Q6. Which one of the following food chain is likely to have maximum concentration of harmful chemical?
a) Kingfisher, Zooplankton, Fish, Phytoplankton
Q7.What is the reason that a food chain consists of only 3-5 steps?
Q8. Select the biodegradable items from the list given below:
Polythene bags, old clothes, wilted flowers, pencil shavings, glass bangles, bronze statue, vegetable peels, earthen pots
Q9. We do not clean ponds or lakes but an aquarium needs to be cleaned. Why?
Q10. What will be the impact on ecosystem if bacteria and fungi are removed from the environment?
Q11. Vegetarian food habit can sustain a larger number of people. Justify the statement in terms of food chain.
Q12. The number of malarial patients in a village increase tremendously, when a large number of frogs were exported from the village. What could be the cause for it? Explain with the help of food chain.
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