Q1. Describe double circulation in mammals, Deoxygenated blood from body tissues (except lungs); enters the heart via the right auricle; through the venacava; it flows to the right ventricle; via the tricuspid valve; the right ventricle contracts; pumping blood; via the semi lunar valves; through the pulmonary artery; to the lungs for oxygenation; the oxygenated blood from the lungs; flow through the pulmonary vein; to the left auricle; via the bicuspid valve; to the left ventricle; the left ventricle contracts; pumping blood via the semi lunar valves; through the aorta; to the rest of the body tissues; Max. Describe what happens to a meal of oily beans and maize from the time of ingestion up to the time of absorption, In the mouth; starch in maize; is digested by salivary amylase/ptyalin/diastase into maltose; food is chewed and mixed by teeth and the tongue; rolled into boluses by peristalsis; it enters into the stomach via the cardiac sphincter; in the stomach, gastric juice containing pepsinogen that is activated to pepsin; digests proteins in the beans; into shorter peptides; food is churned and allowed into the duodenum; via the pyloric sphincter muscle; in the duodenum; bile juice secreted by the gall bladder; emulsifies the oils in the beans into tiny oil droplets; pancreatic juice; secreted by the pancrease; contains pancreatic amylase; that digests starch to maltose; pancreatic lipase; that digests the oil in the beans to fatty acids and glycerol; trypsin; digests proteins into shorter peptides;  food enters into the ileum; where succus entericus is secreted; it contains maltase enzyme; that digests the maltose into glucose; that is absorbed; peptidase; digests peptides into amino acids; lipase digests the remaining lipids (oil) into fatty acids and glycerol; which is absorbed through the lacteals of the villi; Max. Q7. (c) Upper antheridium and lower oogonium. Answer: It is a fern in which stem is a aerial. A pack of essay questions to help student revise for exams and develop QWC skills. Please enable JavaScript. (a) Euglenoids (b) Dinoflagellates (c) Slime moulds (d) Chrysophytes. Essay-Questions . AS . 11) Which is the seed plant with fern-like leaves? Created: Apr 2, 2018| Updated: Sep 26, 2018. registered in England (Company No 02017289) with its registered office at 26 Red Lion 51) Which large, unicellular green algae is commonly called an umbrella plant? Click the button below to download the full KCSE-MOCKS Biology essays Questions and Answers … Full Marks A-Level Biology Essay - Carbon dioxide may affect organisms directly or indirectly. Progress tracking for Multiple choice questions, Designed for the CIE A Level Biology (9700) syllabus, for examinations from 2022, Model answers made by experienced teachers. Preview and details Files included (2) pdf, 48 KB. This increases the osmotic pressure of the spongy mesophyll cells; as a result of this, water flows into the cell from other surrounding cell, which in turn takes in water from xylem vessels within the leaf veins; this creates a pull/suction force that pulls a stream of water from xylem vessels in the stem and roots. 20 mks, Q14. Learn vocabulary, terms, and more with flashcards, games, and other study tools. 63) Write the scientific name of an algae with ribbon shaped chloroplasts: Answer: It lives for seventeen years but leads an active life of only five weeks. (d) Ustilago sp.

(b) smaller animals have a higher metabolic rate. 82) Which one of the following statements is wrong? How is the mammalian heart adapted to its functions? (Marks available: 25) ... Read the following passage and then answer the questions that follow. 100) Plants that grow in water are called hydrophytes. 2) Nomenclature is governed by certain universal rules. 3 mks, Heat/hot conditions: Increased sweating; to lose heat through latent heat of vaporization; dilation of arterioles under the skin; to bring more blood to the skin surface to lose heat to the atmosphere; decreased body metabolism; to reduce heat generation; erector pili muscles relax; making hair follicles to relax hence hair lies flat on skin, no air is trapped; to lose heat; slow/reduced muscular activity due to slow metabolism; to reduce heat production; panting to expose tongue and mouth; to release heat; moving to shades to avoid direct heat; aestivation; to escape the extreme heat; flapping of ears to create currents to carry away heat; Cold conditions: stamping of feet; to generate heat; basking in the sun to gain heat directly; less production of sweat; to reduce water loss through latent heat of vaporization; vasoconstriction of arterioles; hence less blood flow to the skin surface to reduce heat loss; increased metabolism through release of more thyroxine hormone; to generate heat; erector pili muscles contract; pulling hair follicles hence hair is raised; to trap a layer of moist air; to prevent heat loss; shivering/rapid contraction of muscles; to yield heat to warm body; Max.

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