1. Fill in the blanks:- (a) New cells are formed from pre-existing cells. (b) Movement of water molecules from their higher concentration to their lower concentration through a semi- permeable membrane is called Osmosis. (c) The functional components of cell are plasma membrane, cytoplasm & nucleus. (d) Protoplasm has two parts- cytoplasm & nucleoplasm. (e) Nucleus, mitochondria & plastids have their own DNA & ribosomes. (f) The shrinkage or contraction of the contents of the cell away from the cell wall is known as plasmolysis. (g) The process by which Amoeba can engulf a food particle is endocytosis. (h) Biogenesis is the manufacture of lipids required for making cell membrane. (i) A cell that lacks nuclear membrane is called a prokaryotic cell & the nuclear region is called nucleoid. (j) Movement of materials in & out of the cell takes place by diffusion & osmosis. 2. What is the advantage of multicellularity over unicellularity? Ans- Division of labour. 3. What are the chromosomes made up of? Ans- DNA & proteins 4. A cell placed in a solution swells up. What kind of solution is it? Why does it happen? Ans- It is a hypotonic sol ution & water enters the cell by endosmosis causing the cell to swell up. 5. Why are lysosomes known as “suicidal bags”? Ans- They secrete powerful digestive enzymes to digest the worn out and damaged cell organelles as well as the cell itself when it loses its functional ability. 6.Why is the nucleus so significant in a cell? Ans- Nucleus has the following important functions- (i) It controls all cell activities (ii) It contains hereditary material that transmits hereditary information from one generation to the next (iii) It helps in cell division 7. Differentiate between plant and animal cells. 1. PLANT CELL 1- Surrounded by two membranes- cell wall & cell membrane. 2- Possess three types of plastids chloroplasts, chromoplasts, leucoplasts. 3- Do not possess lysosomes. 4- Nucleus is towards the periphery. 5- Centrioles are absent ANIMAL CELL 1- Surrounded only by cell / plasma membrane. 2-Do not possess plastids. 3-Possess lysosomes4-Nucleus is in the center .. 5-Centrioles present & help in cell division. 8. Give the major functions of the following cell organelles- (a) Endoplasmic reticulum RER-- Synthesis of proteins as it has ribosomes attached to it SER- Synthesis of lipids required for making cell membrane (b) Golgi apparatus-----------Storage & packaging of various products. (c) Mitochondria------Production of ATP(Adenosine Triphosphate) which is a source of energy. (d) Ribosomes ---Protein synthesis (e) Golgi ApparatusStorage & packaging of various products. f) LysosomesDigestion of worn out & damaged organelles You may also like :
Chapter : The Fundamental Unit of Life IX Biology SA_1 Chapter : Tissues IX Biology : Improvement in Food Resources CBSE BIOLOGY TERM-1 Guess Paper -1 Download CBSE BIOLOGY TERM-1 Guess Paper -2 Download
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CBSE SOLVED TEST PAPERS CLASS - IX Science (Is matter around us pure)
Q. What is distillation? Ans: Distillation is a method of separating mixtures based on differences in their boiling points. The compound which have higher boiling point will distillate later while the compound which have lowest boiling point will distillate out first. Q. How is blood a heterogeneous substance? Ans: Blood is a heterogeneous mixture because it a mixture of plasma, blood cells, glucose, proteins, mineral ions, hormones and many different salts dissolved in it. Thus the dispersed phase and dispersed medium are in different physical state and hence a heterogeneous mixture Q. Calculate the mass of sodium sulphate required to prepare its 20% ( mass percent ) solution in 100g of water? Ans: Mass % of Sodium sulphate in the solution = 20% If the total mass of the solution = 100g Then mass of sodium sulphate = (20/100)x100 = 20 g Mass of water = 100-20 = 80 g. Q. Arun has prepared 0.01% ( by mass ) solution of sodium chloride in water, calculate the composition of soltution. How do you do it ? Ans: Mass % of solute = 0.01 % of NaCl in water Mass % of solute = [Mass of solute in grams / Mass of solution in grams] x 100. Let us suppose that mass of the solution is 100 g. Therefore mass of NaCl = 0.01 g Mass of water = 100-0.01 = 99.99 g. Q. How to separate components from mixture containing sulphur, charcol , pottasium nitrate? Ans: The mixture containing sulphur, charcoal and potassium nitrate can be separated by following technique: A. Add water to the mixture. Potassium nitrate will dissolve in water. Filter the solution. B. Filterate is solution of potassium nitrate and residue contains sulphur and charcoal. C. Evaporate the filterate, water will vapourize leaving behind potassium nitrate. D. To the residue containing sulphur and charcoal add carbon disulphide, this will dissolve sulphur. E. Filter this solution. F. The filtrate will contain sulphur dissolved in carbon disulphide and residue will be charcoal. G. Evaporate the filtrate, to obtain crystals of Sulphur. Q. Acetone evaporates in normal room temp. Why do we have to heat it to its boiling point? Ans: At room temperature the rate of evaporation of acetone is slow, to speed up the process to evaporate all the acetone in the mixture, we supply heat. You may also try: 10th Science Sample Paper SA -1 -2012 Download File 10th Science Sample Paper SA -1 -2012 Download File 10th Science Sample Paper SA -1 -2012 Download File For more papers Visit page SAMPLE PAPER 9th Maths Sample Paper SA-1-2012 Download File 9th Maths Sample Paper SA-1-2012 Download File For more papers Visit page SAMPLE PAPER X Triangles :Criteria for Similarity of Triangles Solved:
The surroundings where organisms live naturally are called its habitat.
Plants and animals have special features that help them to survive in their own habitat Habitat can be terrestrial or aquatic. Terrestrial habitat: the land where all plants and animals survive is called territorial habitat .For example: deserts, forests and grasslands, as well as coastal and mountain regions. Camels and cactus plants live in deserts only. Aquatic habitat: The water where plants and animals survive is known as aquatic habitat like rivers, ponds, lakes, ocean and swamps. For example, fish live in water. Adaptation: Plants and animals develop certain habits that help them survive in their surroundings, and this is known as adaption. Acclimatization: The small adjustments by the body to overcome small changes in the surrounding atmosphere for a short period of time are called acclimatization. Biotic and Abiotic components: These are living and non living components of a habitat . Biotic components include all the livings organisms in a habitat like plants and animals .it is further classified into producers ,consumers , scavengers’ and decompose Abiotic components include all the non-living things in a habitat like air, water, soil, sunlight and heat. Q. What is the name for food producer? Ans: Autotrophs. Q. Is desert habitat terrestrial or aquatic? Ans: terrestrial Q. What is the term used to describe the response of plant and animals to light? Ans: Photo tropism Q. What we name the Plants growing in dry desert area ? Ans: Xerophytes Q. What is decomposer? Ans: Organism that feed on the dead and decay remains of plants and animal is called decomposer. Eg. Microorganism like bacteria and fungi. Q. How are decomposes helpful to us? Ans: Decomposer help to break down dead plants and animal into organic matter that increase fertility of soil . Q. What are scavengers? Ans: Living organism feed on dead animals helps to clean environment are called scavengers like vulture, crow , jackal etc. Q. What type of consumer are carnivores? Ans: Secondary consumer as the feed indirectly on plants for example tiger , lions, wolves etc Q. State any two flight adaptation seen in areal animals? Ans: Two flight adaptations seen in areal animals are: (a) Body modified like boat to minimize air resistance (b) The limbs are modified into wings Q. Define: (a) Epiphytes (b) Pneumatic bones (c) Nictitating membrane Ans: (a) Roots of some plants like Spanish moss and some fern grow on other plants or tree to get sunlight is known as Epiphytes. (b)The animals that can fly have hollow bones that are called Pneumatic bones. Like bones of birds (c) The membrane that protect eyes of fish under water is called Pneumatic bones Q. What are the adoptation seen in desert plants? Ans: The adaptations seen in desert animals are: (a) Store extra water in their body (b) Lives in deep borrow (c) Try to avoid body contact with hot ground (d) Having long eye lash to protect eyes from sand Q. How does temperature affect plants and animals? Ans: Temperature affects the structure of leaves and stem of plants. Temperature affects the colouration of some birds and animals. Temperature also affects the size and body parts of animals. Q. Biotic and abiotic component are dependants on each other Explain? Ans: Animals depends on plants for food. Plants depend on light, air, soil and water for preparation of food. Therefore, biotic components directly or indirectly depend on abiotic components. Decomposers break down dead biotic components into organic matter that enrich soil. Photosynthesis help to maintain balance of gases in air and water in nature. Q.What we call the plants that grow in moist habitat? Ans: Mesophytes Q. what is the meaning of oviparous and viviparous Ans: Oviparous are those animals which lay eggs example- crow, lizard where as viviparous are those animals which do not lay eggs and give birth to young ones for example- lion, dog. Q. How is a cactus adapted to survive in a desert? Ans: Cactus has a waxy surface with lots of water in it. it also has thorns to prevent loss of water. This is how it lives in the desert. it also lives just because of its thick fleshy stem. Q. What is acclimisation? Ans: The small problems some time occur in the body of organism over short period , The process of overcoming small changes in the surroundings is called acclimisation. Q. How do plants and animals adapt themselves? Ans: Plants and animals adapt themselves to different surroundings with the help of adaptive features they have. For Example: Presence of wings, flight muscles and a stream-lined body helps birds in flight. Birds also have hallow bones that make their body light. Presence of fur on the body of the polar bear which protects it from the cold temperature. Q. Write two adaptive features in frog which help them to stay both of them water and land. Ans: Frogs have moist skin for exchange of gases in water and they have lungs to breath in air Q. Give reasons: (a) Why are deep sea worms blind? (b) Why are some marine creatures living in the deep sea give out light of there of own? (c) Why the upper surface of the leaves of lotus have a thick cuticle ? Ans: a. As we move deep into seas and oceans the amount of light or the visibility decreases. Deep sea worms are blind because of the lack of requirement. Some worms have large eyes but those are not for the purpose of seeing. These worms have developed strong sense of smell to encounter these problems. b. Since there is lack of light in deep seas, some organisms can give out light to assist them in finding their way in the dark. This also helps them in finding prey to feed on and can also be used to find a mating partner. C. Lotus is an aquatic plant. The leaves of the lotus plant have a thick waxy cuticle that helps in repelling water and keeps the stomata open so that water transport occurs effectively in plant Q. why do cockroaches hide their face when sunlight falls on them? Ans: Cockroaches have some light receptors cells in their eyes which cannot tolerate the high intensity light. This is the reason why they run toward darker areas during sunlight. |
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