HOME WORK FOR SUMMER BREAK
SUBJECT- Science
class ix
Part-a
1-Organisms lacking true nucleus are called –
(a) Eukaryotes (b) prokaryotes (c) Haploids (d) Diploids
2-Plasmolysisin a plant cell is defined as –
(a) Break down (lysis) of plasma membrane in hypotonic medium
(b) Shrinkage of cytoplasm in hypertonic medium
(c) Shrinkage of nucleoplasm (d) None of these
3 -Which organelle is called ‘Power house’ of the cell
(a) ER (b) Mitochondrion (c) Golgi apparatus (d) nucleus
4 -The ‘Cell theory’ was proposed by –
(a) Mendal and Morgan
(b) Watson and crick
(c) Schleiden and Schwann
(d) Darwin and Wallace
5- What in protoplasm? Who gave the term protoplasm?
6- Differentiate between hypertonic and hypotonic solution.
7- Explain “A cell is a basic unit of an organism”.
8- Write function of plasma membrane
9- Write short notes on – mitochondrion, chloroplast
10-Name the cell organelle found in plant cells only. Write its types and
function.
11-Write the main function of each of the following.
(a) Plasma membrane (b) cell wall (c) Ribosome
(d) Lysosome (e) Nucleolus (f) Endoplasmic reticulum
12-What are different types of Endoplasmic reticulum
write their function
13-Draw a plant cell and label the parts
(a) Synthesize food
(b) produce energy
(c) Store house of organic substances like protein,organic acids
(d) Packages material coming from endoplasmic reticulum
(e) Determine function and development of the cell
Part-B
1-The only cell organelle seen in prokaryotic cellis –
(a) Mitochondrion (b) Ribosomes
(c) Plastids
(d) Lysosomes
2 ‘Ribosomes’ are associated with synthesis of
(a) Fats
(b) Protein
(c) Carbohydrates
(d) Vitamin
3 The membrane surrouding a vacuole in plant cell is known as –
(a) Plasma membrane (b) Nuclear membrane
(c) Tonoplast
(d) cell wall
4 Select the odd one out –
(a) The movement of water across a semi – permeable membrane is affected by
the amount of substances dissolved in it.
(b) Membrane are made up of organic moleculeslike proteins and lipids
(c) Molecules solublein organic solvent,can easily pass throug the membrane.
(d) Plasma membrane contain chitin and sugar in plants
5 What is the role of ribosmes and golgi body?
6 What is the importance of nucleus?
7 Write an activity showing osmosis.
8 What is ATP? Write its full form.
9 Why lysosomes are called ‘suicidal bags?
10.What is cell theory? Who formulated it?
11.Draw the structure of mitochondria.
12.What are cell organelles? Write the names of different cell organelles.
Part-c
1.Which macronutrient is required in largest quantityby plant?
(a) Nitrogen (b) Molybdenum (c) Potassium (d) Copper.
2.‘Blue Revolution’ refers to increase in –
(a) Milk Production
(b) Egg Production
(c) Grain Production (d) Fish production.
3.Which one of the following includes only Micronutrients–
(a) Iron, Copper, manganes
(b) Iron, Zinc, calcium.
(c) Boron, copper and potassium. (d) Molybdenum, Copper, Sulphur.
4.The enrichment of water bodies with nutrients leading to excessive growth of
phytoplankton is known as –
(a) Nitrification
(b) Ammonification
(c) Eutrophication (d) Phyto –enrichment.
5.What are weeds? Give two examples.
6.What is crop rotation?
7.What are drones?
8.What is pasturage and how is it important?
9.Define (a) Pisciculture (b) hatcheries (c) swarming
10.What is green manuring? Give examples of green manures.
11.Discuss the preventive measures for the storage of grains.
12.Name three basic scientific approaches for increasing yield of a crop.