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Why is a person having blood group AB called universal recipient and a person with blood group O called a universal donor?
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Find the odd one out, giving reason.
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Name the main artery which carries blood to different parts of the body.
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How many litres of blood does an adult human body have?
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Write a short note on the human heart.
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What are seen as greenish blue lines in our hands and legs?
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Put a tick mark (✓) against the correct alternative in the following statement
Reproductive whorls of a flower are:
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Name the scientist who invented the first microscope.
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Match the columns :
| Column A | Column B |
| (a) Radicle | (i) Shoot |
| (b) Plumule | (ii) Store food material |
| (c) Cotyledon | (iii) Root |
| (d) Testa | (iv) Absorb water needed for germination |
| (e) Micropyle | (v) Protection of seed |
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Fill up the blank with the terms given below
The ____ is the structural unit of all living things
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Fill up the blank with the terms given below
All cells arise from ______ cells
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Try to find the names of four cell organells hidden in this maze, (hint: The hidden words can appear horizontally or vertically; forwards or backward or even mixed up). Write them in the lines provided. For example : “NUCLEUS” in the last row, seven backward letters.
| A | J | F | B | H | E | M | O | E | L | O | U | C | A | V |
| H | V | L | E | U | C | O | P | L | A | S | T | N | O | E |
| C | H | R | O | M | O | P | L | A | S | T | X | T | E | R |
| S | U | E | L | C | U | N | W | P | L | A | S | T | I | D |
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Fill in the blanks:
Organisms which are made up of a single cell are called ______ organisms.
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Match the name of the organelle given in Column A with its function given in Column B.
| Column A (Organelle) | Column B (Function) | ||
| 1 | leucoplast | a | help in cell division |
| 2 | nucleus | b | transport of material |
| 3 | ribosomes | c | making food |
| 4 | mitochondria | d | digesting foreign bodies |
| 5 | endoplasmic reticulum | e | storage of starch and proteins |
| 6 | golgi bodies | f | making the cell turgid |
| 7 | chloroplast | g | making proteins |
| 8 | centrosome | h | controlling all the vital activities of a cell |
| 9 | vacuole | i | releasing energy |
| 10 | lysosomes | j | synthesis of cell wall in a plant cell |
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Write true or false for each statement. Rewrite the false statements correctly:
The size of a cell is usually measured in centimetres
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Write true or false for each statement. Rewrite the false statements correctly:
Growth and reproduction are based on cell division
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Biting nails should be strictly avoided. Give reason.
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Regular exercise and proper rest is a must. Give reason
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Children eating more of fast food tend to suffer from obesity (overweight). Comment
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