Content: 31 pages with 60 questions and answers.

(a) Prostista have photosynthetic and heterotrophic modes of nutrition (b) Some fungi are edible (c) Nuclear membrane is present Monera (d) Cell wall is absent in Animalia. Square Describe the route taken by water from the soil up to the evaporating surface of a plant, Water is drawn into the root hair cells by osmosis; due to the presence of dissolved substances in the cell sap of root hairs, the concentration of cell sap is greater than that of the surrounding solution in the soil/concentration gradient; this exerts a higher osmotic pressure, thus drawing the water molecules across the cell wall and cell membrane into the root hair cells; more water drawn into the root hair cells dilutes the cell sap; making it less concentrated than that in the adjacent cortex cell of the root; due to osmotic gradient, water moves from the adjacent cells to the next by osmosis; until it enters the xylem vessels located in the center of the root; the xylem vessels of the root then conduct the water up into the xylem vessels in the stem into the leaves; there is a force in the roots which pushes water up the stem; this force is known as root pressure; and can be considerably high in some plants; energy from the endodermal cells of the root is responsible for driving this force; in the xylem vessels, water would rise up by capillarity; to some extent because the vessels are narrower and there is  a high attractive force between the water molecules and the cell walls; the cohesive; and adhesive forces are important in the maintenance of a continuous and uninterrupted water column in the xylem vessels up the tree to the leaves; water vaporizes from the spongy mesophyll cells; their cell sap becomes concentrated than the adjacent cells. Answer: Three – Chlorophyta, Phaeophyta, Rhodophyta. Answer: A. 2) Nomenclature is governed by certain universal rules. 1) Give an example of seedless vascular plants: 2)  Nomenclature is governed by certain universal rules.

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5) What do you know about the leaves of ferns? 20 mks.

36) Who first proposed that life originated from non-living substances through chemical processes? Use the links below. This category contains 60 biology essays, questions and answers to help with your high school revision. (a) Sargassum (b) Ectocarpus (c) Ulothrix (d) Spirogyra. About this resource.

31) Differentiate between sporophyte and gametophyte: Answer: Sporophyte is diploid, Gametophyte is haploid. 30) The motile bacteria are able to move by: (a) Fimbriae (b) Flagella (c) Cilia (d) Pili.

They are totally genuine essay questions which have been sent to us by students to help out others who are struggling deciding on their own essay question. 10) Five kingdom system of classification suggested by R.H. Whittaker is not based on: (a) Presence or absence of a well-defined nucleus. Loading... Save for later. A pack of essay questions to help student revise for exams and develop QWC skills. 20 mks, Q14.

20 mks, Q2.

A Level Biology Essay Questions.

Created: Apr 2, 2017. This force, known as transpiration pull; helps in maintaining a continuous column of water from the roots to the leaves; water flows from the midrib into leaf veins from where it enters leaf cells; from the mesophyll cells, it enters the airspaces; then the substomatal air chambers; from where it evaporates through the stomata; to the atmosphere; Max. 94) Which one of the following is wrong about Chara? Q7. Required in the dark stage of photosynthesis; it combines with the hydrogen ion from the light stage; to form glucose, proteins and lipids; low concentrations reduces the rate of production of energy and food; while high concentrations leads to an increase in the amount of energy and food formed; It is used to break down water molecules (through photolysis); into hydrogen ions, oxygen and energy; the energy and hydrogen ions formed are used in the dark stage; Green pigment that traps light energy from the sun; that is used in photolysis of water molecules; Temperature affects the enzymes involved in photosynthesis; suitable/optimum temperatures activate enzymes; for maximum production of food; while extremely low temperatures inactivate enzymes; leading to less or no production of food; high temperatures denature enzymes; stopping the process of photosynthesis; photosynthetic enzymes work well in low pH; so the rate is high; while higher pH reduces enzyme activity; lowering the rate of photosynthesis; Forms a medium for the chemical reactions; it is split to yield hydrogen ions, oxygen and energy for use in the dark stage; solvent for the materials used in photosynthesis; Max. 27) How do the conifers reduce the rate of transpiration? How is the mammalian heart adapted to its functions? How are the small intestines in mammals adapted to their functions?

28) Who first put forward the nebular hypothesis of the origin of the solar system? London WC1R 4HQ. Read: Chemistry Questions and Answers – Basic Chemistry, Check General Knowledge Questions and General Knowledge Quiz Questions and Answers.

Online Biology Questions and Answers – Basic Biology Part 2 (26-50) 26) Viruses have: (a) DNA enclosed in a protein coat (b) Prokaryotic nucleus (c) Single chromosome (d) Both DNA and RNA. This website works best with JavaScript switched on.

20 mks, Q16. Top Marks A-Level Biology essay - The Importance of Movement in Living Organisms, Top Mark A-Level Biology essay - The membranes of different types of cells & their functions, Top Mark A-Level Biology essay - The importance of DNA in science and technology, SAVE 60% Concise A* Complete A Level Biology AQA Spec & Mark Scheme Based Revision Notes / Summary (topic 1-8) and required practical workbook, The Importance of movement in living organisms, Explain the importance of shapes fitting together in cells and organisms. Answer: Highly evolved brain, skilled hand.

Start studying A LEVEL BIOLOGY: 25 Mark essays. 77) Where did the multicellular plant life originate? Content: 31 pages with 60 questions and answers.

20 mks, Q6. 20 mks. 1.1 | Development of Practical Skills (Part 1) Question Paper Mark Scheme; 1.1 | Development of Practical Skills (Part 2) Question Paper Mark Scheme; 2. 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.

A collection of high mark, sample essays for A-Level Biology, providing helpful revision content and examples of logical structuring. Heart is enclosed in a pericardial membrane/pericardium; that produces a fluid; to lubricate it; the membrane also keeps the heart in position; It is covered in a fatty layer; that acts as a shock absorber; made up of cardiac muscles; which are interconnected/interacted hence contract and relax without fatigue or nervous stimulation/myogenic; for continuous pumping of blood throughout the lifespan of the animal; the muscles are supplied by nutrients and oxygen; by the coronary arteries; and the coronary veins take away wastes and carbon (IV) oxide; heart is divided into 4 chambers; for efficient double circulation/ avoid mixing of oxygenated and deoxygenated blood/carry large volume of blood; has interventricular septum; to separate oxygenated and deoxygenated blood; ventricles are thick/muscular; to generate high pressure to pump blood out of the heart; left ventricle has thick muscles/more muscular; to pump blood to all body tissues; heart has bicuspid; and tricuspid valves; to prevent back flow of blood to left auricle; and right auricle respectively; valves have tendinous cords/valve tendons; to prevent them from turning inside out; semi lunar valves located at the beginning of major arteries; prevent backflow of blood into the ventricles; has sino-artrio node located in the muscles of the right auricle; to initiate heart beat/contractions of heart muscles/cardiac muscles, rate of heart beat is controlled by nerves; vagus nerve; slows down heartbeat; while sympathetic nerve; speeds up the heartbeat; has aorta; to transport oxygenated blood to all body parts; has pulmonary artery; that transports deoxygenated blood from right ventricles to lungs for oxygenation; has pulmonary vein; that transports oxygenated blood from lungs to the left ventricles; for distribution to all body parts; has the venacava; that  receives deoxygenated blood from all body parts to right ventricles; Max.

Secreted by the (posterior lobe/end) pituitary gland; in response to an increase in the osmotic pressure of blood; the hormone stimulates the distal convoluted tubules and the collecting ducts; to increase their permeability to water; this increases the reabsorption of water into the bloodstream; concentrated and less urine is excreted; when the osmotic pressure decreases, less or no hormone is produced; hence the tubules become impermeable to water; less water is reabsorbed into the bloodstream; hence more dilute urine is excreted; fluctuations in the osmotic pressure is detected by the hypothalamus; Secreted by the pancrease; in response to a rise in blood sugar level; it stimulates liver cells to convert the excess glucose into glycogen and fats for storage in the liver and muscle cells; increases the oxidation of glucose in respiration to yield water energy and carbon (IV) oxide/increases metabolism in the body; this leads to a fall in blood glucose to normal level; Secreted by the pancrease; in response to a decline in blood glucose level; it stimulates liver cells to convert the stored glycogen and fats back to glucose; stimulates the conversion of amino acids to glucose; and stops the oxidation of glucose in the body cells; the glucose formed is released to the bloodsteream causing a rise of blood glucose level to normal; Max.

1) Give an example of seedless vascular plants: Answer: Ferns.