OLER
ओ३म्
D. A. V. PUBLIC SCHOOL
Bihar Zone - F
Mid-Term Examination -2020
Time : 03 Hrs.
M. Marks : 80
: IX
Class
Subject : Science
ESTD. 15
General instructions:
1. Questions 1 to 5 are one marks. They are to be answered in one word or one/sentence.
2. Question 6 to 14 are two marks questions. They are to be answered in about 30 words.
3. Questions 15 to 23 are three marks questions. They are to be answered in 50 words
4. Questions 24 to 26 are five marks questions. They are to be answered in about 70 words.
5. Questions 27 to 37 are multiple choice based on activities. Each question is a one mark
6. Questions 38 to 39 are explanatory questions based on activities. Each question carry two mark
1 Name the smallest known atom in nature.
2. What does ATP stand for?
3 Which tissue makes up the husk of coconut?
4 Can a body have constant speed but variable velocity?
5 What happens to the force of gravitation between two bodies if the distance between the bodies is
tripled ?
6 Is sea water fit for washing and drinking ? Give reason ?
7 Name two elements which exist in liquid state at room temperature.
8 Write chemical formulae of (1) Hydrogen Sulphur (in) Iron (IT) chloride
9 Differentiate between Diffusion and Osmosis.
10 What is membrane biogenesis ? How plasma membrane is formed during this process?
11 How are simple tissues different from complex tissues in plant?
12 Why can a small mass such as a bullet kill a person when fired from a gun?
and 2
Answers
Answer:
1. hydrogen
2.Adenosine triphosphate
3.Sclerenchyma tissue
4.Yes, a body can have constant speed but variable velocity. For example, a body in uniform circular motion has constant speed but its velocity changes at every point during the course of motion.
5.If the mass of both of the objects is doubled, then the force of gravity between them is quadrupled; and so on. ... If the separation distance between any two objects is tripled (increased by a factor of 3), then the force of gravitational attraction is decreased by a factor of 9 (3 raised to the second power).
6.Sea water is not fit for drinking because it has many salts dissolved in it which is not good human body.
7.At this temperature and ordinary pressure, only two elements are liquids: Bromine. Mercury.
8. H2s , I, cl
9Osmosis: Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. ... Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.
10.The process of plasma membrane formation is called membrane biogenesis. The proteins and lipids are first synthesised in rough endoplasmic reticulum and the smooth endoplasmic reticulum, respectively. These are then transported to the Golgi complex for their modification
11.Simple Tissues
Complex Tissues
Nature of the Tissue
Homogenous Heterogenous
Example
Parenchyma, Collenchyma, Sclerenchyma Xylem, phloem
Function
Repair of tissue, food storage, secretion, and structural support Conduction of minerals and water to various parts of the plant body
Distribution
Located in every part of the plant Primarily located in the vascular regions
Cell Composition
Composed of a single type of cell/ all cells perform a similar function Composed of various types of cells that perform various functions
12.It is so because even if the mass of the bullet is small, it moves out of the gun with a very high velocity, due to which the momentum produced is high (p = mv). This high momentum of the bullet kills a person.
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