Test Code: LCH Paper- I (Science) Test
No. 2018-001
Date: 07/01/2018 Duration:
60 min
Class: X Marks:
25
Note: attempt all question,
questions are dived into two sections, section A and Section B, both sections
are compulsory
Section
- A
Q 1. What is DNA? 1
Q 2. a) how is brain protected from injury and shock?
b)
name two main parts of hind brain and state the functions of each. 1
Q 3. The genotype of green-stemmed
tomato plants is denoted by GG and that of purple -stemmed tomato plants as gg.
When these two plants are crossed 3
x 1 = 3
1.
What
color of stem would you expect in their F1 progeny
2.
Give
the percentage of purple – stemmed plant if F1 plants are self-pollinated
3.
In
what ratio would you find the green and purple color in the F1
progeny?
Q 4. The chromosome number of the
sexually reproducing parents and their offspring is the same. “justify this
statement 1
Q5. 1
x 3 = 3
b) what is pollination? Explain its
significance
c)
explain the process of fertilisation in flowers. Name the parts of the flower
that develop after fertilisation into
i) seed ii) fruit
Q6.
There are two different types of organs, homologous and analogous.
Differentiate between them by giving three points 3
Section B
Q 7.
What is synapse? In a neuron cell how is an electrical impulse created and what
is the role of synapse in this context? 3
Q 8.
Draw a diagram of human excretory system and label renal artery and urethra.
And state in brief the function of 2.5
x 2 = 5
a.
Renal
artery
b.
Kidney
c.
Ureter
d.
Urinary
bladder
Q9.
a) list the three events that occur during the process of photosynthesis.
Explain the role of stomata in this process. 2.5
b) describe an experiment to
show that “sunlight is essential for photosynthesis” 2.5
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