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From Guess Papers: Choose the correct answers from the following: 1. _________ described the circulation of blood in 13th century. (Bu Ali  Sina , Ali Bin Isa,  Ibn -Al  Nafees ) 2. Each fore limb of frog has _________ fingers. (4, 5, 6) 3. Fruit is formed by the enlargement of _________. (Stigma, Style, Ovary) 4. The earthworm belongs to the phylum _________. ( Nematoda ,  Annelida ,  Mollusca ) 5. The saliva contains an enzyme known as _________, which acts on carbohydrates. (Lipase,  Trypsin , Ptyalin) 6. _________ tissues specialize in contraction. (Connective, Muscle, Nervous) 7.  Goitre  is caused by the deficiency of _________. (Insulin, Glucagon, Iodine) 8. There are _________ chromosomes in each cell of a human being. (24, 32, 46) 9. “Al- Qanun   Fi-Tibb ” is written by _________. (Al- Tabra , Al- Farabi , Bu Ali  Sina ) 10. _________ is the sensory layer of the eye. (Sclerotic, Reti...

From Guess Papers: Complete the following sentences with appropriate answers: 1. Cell was discovered in 1665 by _________. 2. Fungi cannot make their own food because they lack _________. 3. The physical and chemical breakdown of food in humans first begins in the _________. 4. During respiration _________ is released from food. 5. The different parts of human body and their functions are described in the book _________ written by Abdul  Malik   Asmai . 6. The study of tissues is called _________. 7. The hormone insulin is secreted by _________. 8. Tape-worm belongs to the phylum _________. 9. The fourth whorl of a flower is known as _________. 10. Stem increases in thickness due to _________. 11. The distance between two nodes of a stem is called _________. 12. “Al- Mansoora ” is written by _________. 13. The third eyelid (transparent membrane) that protects the eye of frog in water is known as _________. 14. The organs of locomotion in _____...

From Guess Papers Rewrite the following sentences after correcting them: 1. Aristotle has been one of the most famous Roman philosophers and naturalists. 2. A typical animal cell consists of cell wall, cell membrane,  nucleus  and contains plastids, mitochondria, endoplasmic reticulum, Golgi,  ribosomes  and  centrosomes . 3.  Ribosomes  help in making  fibres , which help in movement of chromosomes during the cell division. 4. The hereditary material DNA is in the endoplasmic reticulum. 5. Photosynthesis is an example of  degradative  metabolism. 6. The typical number of chromosomes in a resting cell is ‘n’ chromosomes. 7. In a cell which is ready for mitotic division, the chromosomes and its DNA become half. 8. Penicillin is a bacterial product. 9. Ostrich is a  bitd  having very strong wing muscles. 10. Leaves of monocotyledons possess veins in the form of a network. 11. Proteins cannot be used by...

Respiration: The oxidation of the absorbed food material in order to obtain energy is called respiration. There are two types of Respiration in the organisms: 1. Anaerobic Respiration 2. Aerobic Respiration Aerobic Respiration: In most of the higher and larger organism, the glucose etc is oxidized by using molecular oxygen. This type of respiration is known as Aerobic Respiration. In aerobic respiration a mole of glucose is oxidized completely into carbon dioxide and water releasing enormous amount of energy. One glucose molecule in this respiration produces 686,000 calories of energy. Aerobic respiration thus produces 20 times more energy than the anaerobic respiration. In aerobic respiration food is oxidized in presence of molecular oxygen. Stages of Aerobic Respiration: There are two stages of Aerobic Respiration: (a) External Respiration In this stage, the organisms take the air (containing oxygen) into their bodies. This is called external respiration....