Central Institute of Higher Tibetan Studies 2009 CBSE CLASS X - Question Paper

I I : In case of a.c. both the value as well as the direction of the current modifications. 1
part B
17. Aerobic respiration/accumulation of lactic acid/non availability of oxygen. 1
18. Pancreas
Trypsin / Lipase / Amylase 1
19. Sulphur dioxide and Nitric oxide 1
20. The solar cooker with the glass slab; as the heat gets trapped within the cooker and
the temperature of the cooker rise. It rises more than the uncovered cooker / Green
house effect. 2
21. one - light energy.
2 - chemical energy. 2
22. (i) gorilla, fish, cockroach, mangotree.
(ii) gorilla 2
23. Snake :
Snake is a secondary consumer while hawk is a tertiary consumer. At every trophic
level a few energy is lost to the environment. Hawk is at the fourth trophic level and
the snake is at the third trophic level, so more energy will be available to the snake.
24. (i) xylem - water and minerals
(ii) phloem - sugar
(iii) pulmonary vein - Oxygenated blood 2
(iv) Vena Cava - Deoxygenated blood
25. Fossil.
315
All preserved traces of residing organisms are called fossils. The studies of extinct
species show the evidence of evolution. 3
26. (i) The nonrenewable resources are limited, so we should use them judiciously.
(ii) We should encourage the use of renewable resources.
(iii) Preserve the environment for future generations.
(iv) The benefits of the controlled exploitation should go to the local people
(any three) 3
27. (i) monohybrid cross.
(ii) red colour of flower dominant over white flower
(iii) RR, rr (b) Rr (c) RR, Rr and rr 5
OR
(i) herbivore
(ii) primary consumers
(iii) 10%
(iv) soil and sunlight
(v) solar energy. 5
316
X SCIENCE (THEORY)
BLUE PRINT II
VSA SA - I SA - II LA Total
Unit (1 Mark) (2 Marks) (3 Marks) (5 Marks)
Chemical Substances 3(3) 4(2) 6(2) 5(1) 18(8)
World of residing 2(2) 6(3) 3(1) 5(1) 16(7)

Earning:   Approval pending.