Bio Section B

17 flashcards · Other · by anshul srivastava

41) what is difference between voluntary action and in voluntary action?
Voluntary action vs Involuntary action 1)These action are under the control of our will. 1)These action are not under the control of will. 2)Initiated by some stimulus like touch, pain ,pressure, heat, light. 2)Initiated by a willing thought. 3) walking, eating 3)withdrawal of hands after touching hot things.
42)Which parts of plant produce gibberllins?state two functions of gibberlin.
Ans-The major sites of gibberllin production in plants are embryo, roots and young leaves near the shoot tip. The functions of Gibberllin are following: a)They are used in process of malting in brewing industry to speed up the process . b) It delay senescence in plants.
43) wrirte the importance of plasma protein.
Fibrinogen,globulin and albumins are major plasma proteins. Fibrinogen are needed for clotting or coagulation of blood. Globulin primary are involved in defence mechanism of the body and albumin help in osmotic balance.
44)Where do ultrafilteration, reabsorption and secretion occur in a nephron?
i) Ultrafilteration occurs in Bowman’s Capsule. ii) Reabsorption occurs in Proximal convoluted tubule(PCT) , Loop of Henle and Distal Convoluted Tubule. iii) secretion occurs in Proximal convoluted tubule, Loop of Henle and Distal Convoluted tubule.
45)what does nervous system consist of?
Ans-The nervous system consist of three parts. i)Central Nervous system-(CNS)- It comprises brain and spinal chord . It is a site of information processing ans control ii)Peripheral Nervous System-(PNS)- It comprises of of all the nerves of the body associated with Central Nervous system. iii)Autonomic Nervous system- (ANS)-it comprises parasympathetic and sympathetic nerves.
46) Give reasons. i) Smog formation occurs in cold weather.
Ans- The combustion of fossil fuels increases the amount of suspended particles such as unburnt carbons , smokes of industry, fire in the air.Water also condenses in cold weather .Presence of high pollutants level of pollutants in cold weather with condensation of water form Smog.
Give reasons. ii)Glucose is not found in the urine of a healthy person.
Ans-Glucose is reabsorbed in the blood stream in the proximal part of the nephron so it is so in normal healthy person glucose is not found in the urine.
Give reasons. iii) Tendril coil around when they come in contact with hard rough objects
Ans- The growth movement of tendril in response to unilateral stimulus if touch is called Thigmotropism. Tendril coil due to unequal growth of two sides of a tendril.The growth of the surface which comes in contact of a support is retarded while it remain normal on other side so it coils around a support.
Give reasons. iv) Root grow downward into the soil.
Ans- Root s are negatively phototropic and positively geotropi so they grow downward in the soil.
Give reasons. v) Injury to Medulla Oblongata results in the death.
Ans-Medulla oblongata controls heartbeat, respiration etc.Injury to it leads to sudden stop of these processes which results to death
47)write the functions of given structures. i) Phloem ii)Abscisic Acid iii) Lymph – iv)Nephron v)seminal vesicles
Ans- Phloem is a vascular tissue present in plants.It is mainly responsible for transport of organic and inorganic substances such as food from leaves to other parts of the plants. Ans-Abscisic acid is growth retarding hormone ABA is produced when a plant is exposed to stress. It is also called stress hormone. It causes stomata to close during stress condition.it causes abscission on leaves flower and bud.It causes auxillary bud to become dormant during winters. Ans- Lymph act as a important ca…
49) i)Write the summary of dark reaction by an eqution. ii)In which process ATP is formed? iii)How do the plant material reach the plant cell?
Ans-i) 6CO2 + 12NADPH +18 ATP → C6H12O6 +12 NADP + 18 ADP + 18Pi + 6H2O ii) In photophosphorylation, ATP is formed ADP +Pi → ATP 1.Aorta 2.Pulmonary Artery 3.SuperiorVenacav 4..L. Auricle a 5.Coronary Artery 6.inferiorVenaCava 7.Aorta iii)Water enters the leaf through midrib and veins from stem and roots . Carbon dioxide enters through stomata from the atmosphere.
50) Describe an experiment to test the presence of starch in leaf.
Ans-Pluck the leaf and boil it in water for a minute so that all trhe cells are killed. Remove the leaf from water and boil it in alcohol to remove its chlorophyll. This will make leaf little hard and brittle. Put the leaf again in hot water to soften it. Spread the leaf in petri dish and pour Iodine solution on it and dropwise with the help of dropper. The leaf shows a blue black colour which indicates the presence of starch in leaf.
51) In the given picture two stages of Human evolution are shown. Answer the given question from given picture. i)Identify Australopithecus and Neanderthal man from the above picture. ii)Mention two characteristics feature of each of them. iii) who proposed the theory of Natural Selection? vi) what are vestigial organs . name two vestigial organs in human being.
Ans- A is Neanderthal and B is Australopithecus Ans-Characters if Neandrethal- They walked upright with Bipedal movement. Their was deep with no chin and skull bones were thick. Charactreistics of Australopithecus.- Their height were 1.5m and had both apes and man characters. They had erect posture and had omnivorous diet. Charles R Darwin proposed the theory of ‘Natural selection’ Ans- The organs which have no longer have a function in our body are called vestigial organ. These organs have red…
Question 2. Given below is an experimental setup to demonstrate a particular tropic movement in germinating seeds. Study the diagram and answer the questions that follow : [5] (i) Label the parts 1 and 2. (ii) Name the tropic movement shown by part 1. (iii) Part 1 is affected by two stimuli. Name them. Which one of the two is stronger? (iv) What is Thigmotropism ? Give one example. (v) What is meant by ‘Positive’ and ‘Negative’ tropic movements in plants? (b) Mention the exact location of the f…
Answer: (i) 1 – Radicle 2 – Plumule (ii) Hydrotropism (iii) Gravity and Water – Water is stronger. (iv) Growth movement of plants in response to touch stimulus, e.g., Sweet Pea (v) Movement of parts of plant towards source of stimulus is positive and away from source of stimulus is negative. Answer: (i) Inside Scrotum (ii) Between malleus and stapes. (iii) In the stroma (matrix) of chloroplast (iv) Cavity between amnion and embryo (v) Between two cerebral hemispheres.
Question 3. (a) The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow : [5] (i) Name the factor studied in this experiment. (ii) What will you observe in the experimental leaf after the starch test? (iii) Explain the process of Photosynthesis. (iv) Give a balanced chemical equation to represent the process of photosynthesis. (v) Draw a neat, labelled diagram of an experimental setup to show that oxygen is release…
Answer : (i) Sunlight (ii) The exposed parts will turn blue-black with iodine solution while the part covered with black paper strip turns brown. (iii) The process by which green plants containing chlorophyll produce food (glucose) from carbon dioxide and water by using light energy. (iv) (v) ICSE 2019 Biology Question Paper Solved for Class 10 January 31, 2020 by Prasanna ICSE Biology Previous year Question Paper 2019 Solved for Class 10 ICSE 2019 Biology Board Question Paper Solved General In…