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Fundamental unit of life : Assignments SA-1–IX Biology Q1 Write the main function of leucoplast. Q2 What is the function of SER in liver cells of vertebrates? Q3 Why the RER appears rough? Q4 Why viruses are not supposed to be living? Q5 What is a nucleoid? Q6 Why dry raisins placed in water swell up? Q7 In which part of a plant chromoplasts are found? Q8 Where are genes located? Q9 What will happen if we keep a plant cell or animal cell in a (i) Hypotonic solution (ii) Hypertonic solution iii) Isotonic solution. Q10 Explain the importance of osmosis for living beings? Q11 Give the historical development of cell theory. Q12 Who coined the term “cell “ and how? Q13 Write the contribution of (a) Robert Hooke, (b) Leeuwenhoek (c) Robert Brown Q14 Draw a large diagram of an animal cell as seen through aan electron microscope. Label...

Fundamental Unit Of Life :  Class IX Biology : Fill in the Blanks 1. A -------------is the basic structural and functional unit of all life forms. Ans: cell 2. Study of structure and composition of cell is called as ------------ Ans: “Cytology”. 3. Cell was first observed by “Robert Hooke” in a dead cork slice in the year 1665. He described about this in his book ----------------- Ans: “Micrographic”. 3. The word cell was derived from a Greek word  ----------  which means small room. Ans: “Cellulae” 4. First living cell was discovered by ------------- Ans: A.V. Leeuwenhoek 5.  The term protoplasm was coined  ---------- in 1839. Ans: by purkinje 6.  Protoplasm was discovered by     ------------ and named as sarcode. Ans: “Felix Dujardin” 7.   --------- is an aggregate of various chemicals such as water, ions, salts and other organic molecules like proteins, carbohydrates, fats, nuclei...

Knowledge B inder A. Very short answer questions: Q1. Define the following terms: a) Photoperiod   b) green manure   c) organic farming d) concentrates e) roughage Q2. Mention one advantage and one disadvantage of green revolution. Q3. What nutrients do we get from: cereals and pulses? Q4. How many nutrients are required in lesser quantities and what are they commonly called? Q5. Why even excess application of manure does not cause pollution? Q6. Give one disadvantage of fertilizer. Q7. Name one crop which can tolerate water logging in field and one which cannot? Q8. What happens when a matured wheat crop is irrigated? Q9. A farmer grows gram crop between two cereal crops. What agricultural practice is being followed? Q10. Give one word: 1) A toxic substance effective against insects. 2) A fungal disease of wheat crop      3) A common weed 4) A weedicide     5) On...

Q1. Which tissue protects the entire body? Answer: Epithelial tissue Q2.Give one example each of:  Answer 1. Squamous epithelium (simple) - cheek cells 2. Columnar epithelium - intestine Q3.Give one example of connective tissue in which matrix is solid? Answer : Bone  Q4. Name the following:  Ans: 1. Multinucleate muscle fibre: - skeletal muscle fibre 2. Spindle shaped muscle fibre: - smooth muscle fibre 3. Tissue which stores fats: - adipose 4. Process of neuron, which carries impulse: -axon Q5.Name one structure in your body, which bears ciliated epithelium. Answer: Respiratory tract Q6.What is aerenchyma? Ans: It is a specialized parenchyma found in aquatic plants which consists of network of small cells that enclose air cavities. Q7.What is the difference between simple plant tissue and simple animal tissue? Ans: SIMPLE PLANT TISSUE         SIMPLE ANIMAL TISSUE 1. Consists of same t...