Class 9 Science Sample Paper (Term 1) - 3 (with solutions): Part - 2 | Extra Documents & Tests for Class 9 PDF Download

Ques 24: What are the functions of parenchyma, collenchyma and sclerenchyma?
Ans: Parenchyma Main function is storage. Some parenchyma cells contain chlorophyll and help in photosynthesis. Collenchyma It is mechanical tissue, provides mechanical support and elasticity. When they contain chlorophyll they help in photosynthesis.
Sclerenchyma It is mechanical tissue, gives support to the plant body. Shell of nuts are hard due to presence of this tissue.

Ques 25: (a) What is cork? Mention its uses.
(b) How many types of elements are present in xylem?
Ans: (a) As root and stem grow older and increase in girth, peripheral tissue of root and stem become cork, cork cells are dead and do not have any intercellular spaces. Cork is protective in function. It is used for manufacture of sports goods, linoleum and for insulation.
(b) It consists of four types of elements:
(i) Tracheids
(ii) Vessels or Trachea
(iii) Xylem parenchyma
(iv) Xylem fibres

Ques 26: Satvik went on his bike from Delhi to Faridabad at 40 km/h and in the evening returned back at a speed of 60 km/h. What is his average speed for the entire journey? What is his average velocity?
Ans: The distance covered in forward journey from Delhi to Faridabad and back way journey from Faridabad to Delhi is exactly same i.e.,S₁ = S₂ = S (say) Again v₁ = 40kmh^-1 and v₂ = 60kmh^-1 Average speed 
 

Ques 27: (a) Distinguish between G and g.
(b) What is the effect of shape of earth on value of g?
Ans: (a) The differences between gravitational constant(G) and acceleration due to gravity (g) are 

(b) The earth is not a perfect sphere. The radius of earth increases from poles to the equator. Hence, as per relation  value of g i s greater at the poles and lesser at the equator.

Ques 28: Two friends were playing 'catch the ball' in a park. 'A' was able to catch the ball comfortably without hurting himself, while 'B' was hurt every time he caught a ball. Finally B asked A how he could catch the ball with ease. A explained the phenomena to B. B thanked him.
(a) Why was A not hurt while catching the ball?
(b) Compare and contrast the values of A and B.
Ans: (a) A would lower his hands while catching the ball. This increased time of momentum change and ball exerted less force on the hands of A.
(b) B is inquisitive, accommodating and a keen observer. A is scientifically tempered, logical and has applicative mind.

Ques 29: (a) How are new varieties of poultry birds with desired traits produced?
(b) Mention any four desirable traits for which new varieties are produced.
(c) List the management practices that are common between dairy and poultry farming.
Or
(a) Write a short note on marine fisheries.
(b) Which factors should be taken into consideration for fish culture?
Ans: (a) By cross breeding between Indian (Indigenous) and foreign (exotic) poultry birds, desired traits are produced.
(b) Following are the four desirable traits for which new varieties are produced
(i) Number and quality of chicks.
(ii) Dwarf broiler parent for commercial chick production.
(iii) Summer adaptation capacity.
(iv) Tolerance to high temperature.

(c) The management practices that common between dairy and poultry farming are
(i) Proper arrangement for housing.
(ii) Proper arrangement for light.
(iii) Proper arrangement of nutrition.

Or 
(a) India's marine fish area include 7500 km long coastline and deep sea beyond it. Marine fish are caught using many kinds of fishing nets from fishing boats. The yields are increased by locating large schools of fish, where large quantities of fishes can be found.
Popular marine fish varieties are pomphret, mackerel, tuna, sardines and Bombay duck.
Large schools are located by using satellites and echo sounders.
(b) The three important factors to be considered for fish culture are
(i) Topography, i.e., location of pond.
(ii) Water resources and their quality.
(iii) Soil quality.

Ques 30: Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving any solid.
(b) We can get the smell of perfume sitting several metres away.
(c) Water at room temperature is a liquid.
(d) An iron almirah is a solid at room temperature.
(e) Ice at 273 K is more effective in cooling than water at the same temperature.
Or
(a) Dry ice is compressed under high pressure. What happens to it when pressure is released?
(b) Define (i) Melting point (ii) Fusion (c) Osmosis is a special kind of diffusion, Comment.
Ans: (a) Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid togas takes place easily. Thus, naphthalene balls disappear with time without leaving any solid.
(b) Gaseous particles possess high speed and large spaces between them. Particles of perfume diffuse into these gaseous particles at a very fast rate and reach our nostrils. This enables us to smell the perfume from a distance.
(c) At room temperature (25°C), water is a liquid because it has the following characteristic properties of liquid (i) At room temperature, water has no shape but has a fixed volume that is, it occupies the shape of the container in which it is kept. (ii) At room temperature, water flows.
(d) An iron almirah is a solid at room temperature (25°C) because (i) it has a definite shape and volume like a solid at room temperature. (ii) it is rigid as solid at room temperature.
(e) At 273 K, when ice melts, it absorbs the energy equal to the latent heat of fusion from the surroundings, therefore causes cooling effect.

Or
(a) On releasing the pressure, dry ice sublimes to vapour state without undergoing to liquid state.
(b) (i) Melting point The definite temperature at which a solid starts melting is called the melting point of that solid, e.g., melting point of ice is 0°C or 273.16 K.
(ii) Fusion The process of conversion of a solid into liquid state on heating is called fusion or melting.
(c) Diffusion is the process in which molecules of a substance move from the place of (their) higher concentration to the place of lower concentration. But during osmosis, the water (or solvent) molecules move from  (their) higher concentration to the place of their lower concentration through a semipermeable membrane. Thus, osmosis is termed as a special kind of diffusion.

Ques 31: Name the tissue responsible for flexibility in plants. How would you differentiate it from other permanent tissues? Or Describe structure and function of different types of epithelial tissues.
Ans: The tissue responsible for flexibility in plants is collenchyma. The distinction of collenchyma from other permanent tissues is given below

Or 
The epithelial tissue are classified as follows
(i) Squamous epithelium: It consists of extremely thin and flat cells forming a delicate lining, e.g., the esophagus and lining of mouth. Skin epithelial cells arranged in many layers to prevent wear and tear, they are arranged in a pattern of layers, the epithelium called as stratified squamous epithelium.
(ii) Cuboidal epithelium: Cells are cube-like with rounded nuclei and form lining of kidney tubule and duct of salivary glands, where it provides mechanical support. It also helps in absorption, excretion and secretion.
(iii) Columnar epithelium: It consists of tall cells, which are pillar-like having elongated nuclei. It is found in inner lining of intestine and helps in absorption and secretion.
(iv) Ciliated columnar epithelium: The ciliated columnar epithelium tissue contains cilia in respiratory tract. The sec ilia move and their movement pushes the mucus forward to clear it. This type of epithelium is thus ciliated columnar epithelium.
(v) Glandular epithelium: Some-times epithelial cells acquire additional specializations as gland cells, which can secrete substances at epithelial surface. A portion of epithelial tissue folds in ward and multicellular gland is formed called glandular epithelium.