10th Class Biology – Important Questions and Answers – 1 Mark Questions

Biology is highly scoring subject in 10th Class. The precise nature of the subject is helpful to the students to understand it easily and perform well in the public examinations. Following are some important 1 mark questions from Biology for the 10th Class students of Andhra Pradesh and Telangana States. These questions are also useful for students of other boards who have similar lessons in the syllabus.

Q: Why dark reaction is stated as light independent reaction?
A: Dark reaction does not require the presence of light. It occurs during the day time and night time also. So dark reaction is stated as light independent reaction.

Q: What is the role of acid in stomach?
A: Hydrochloric acid which is produced in the stomach kills the germs in our food. It also neutralizes the food which is alkaline in nature.

Also Read: 10th Class All Subjects Model Papers, Previous Papers and Questions and Answers

Q: How do non green plants such as fungi and bacteria obtain their nutrition?
A: Non green plants like fungi and bacteria break down the food materials from dead and decaying and then absorb them. This type of nutrition is called aprophytic nutrition.

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Q: What is emulsification?
A: Conversion of fats into small globule like forms in digestion by the help of bile juice secreted by liver is called emulsification.

Q: What is chime?
A: Food in the form of soft slimy substance where some proteins and carbohydrates have already been broken down is called chime.

Q: How can you say that carbohydrates are not digested in stomach?
A: No enzymes are produced in stomach which can digest carbohydrates. So I can say that carbohydrates are not digested in stomach.

Q: What do we call the natural movements of the protoplasm in unicellular animals?
A: Brownian movements.

Q: Imagine that what changes are done when the air passes through nasal cavities in inspiration?
A: Air is filtered in nasal cavities by mucous lining and the hairs growing from its sides remove tiny particles of dust. Air temperature is brought close to that of body.

Q: What is the main reason for feeling pain in muscles after strenuous exercises?
A: Due to anaerobic respiration in muscles, large amount of lactic acid is accumulated and this results in muscular pains.

Q: ”If there are no algae, there will be no fishes in the sea”. How do you justify?
A: Algae produce Oxygen as a result of photosynthesis. This oxygen is utilized by the fishes in the sea for respiration. If there is no oxygen fishes may die.

Q: Imagine what happens if waste materials are not sent out of the body from time to time?
A: The body becomes poisonous and death takes place in organisms.

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Q: What are the main parts in nephron that makes urine?
A: Bowman’s capsule and tubule.

Q: Write any two uses of Tannins.
A: Tannins are used in tanning of leathers and in medicines.

Q: When does kidney transplantation take place? From whom kidney is obtained?
A: Kidney transplantation is a permanent solution for renal failure patients. It is obtained preferably from close relatives.

Q: When plants are exposed to external stimuli, they respond. What do we call this type of response?
A: Nastic movements.

Q: How does anger occur? What is its effect?
A: Increased levels of Adrenaline are responsible for anger. Anger persists for longer period of time, regular metabolic activities are disturbed.

Q: Name the membranes that cover the embryo?
A: Chorion, Amnion and Allantois are the membranes that cover the embryo.

Q: Is it necessary for the replication of DNA in interphase of the cell division? Why?
A: Yes, it is necessary for the replication of DNA. If not, all the chromosomes will disappear from the cell after few cell divisions.

Q: Write the phenotype and genotype ratios by observing the following matrix.
A: Phenotype ratio = 3 : 1
Genotype ratio = 1 : 2 : 1

Q: What are the organ systems involved in digestion of food which we eat?
A: Digestive system, muscular system, nervous system, endocrine system, circulatory system, skeletal system and excretory system.

Q: Endocrine system also involved in the process of digestion. What are the hormones secreted in digestive system?
A: Ghrelin and leptin regulate hunger.
Secretin and cholecystokinin stimulate pancreas and liver.

Q: The dental formula of human is 2/2, 1/1, 2/2, 3/3.
a) How many incisors present in his mouth?
b) How many tearing teeth are present in his mouth?
A: a) 8 b) 4

Q: What is the usual range of pH of your mouth? And after eating?
A: Usual range is below 7 – Acidic in nature. After eating it is beyond 7 – Alkaline nature.

Q: Archaeopteryx is recognized as connecting link between aves and reptiles. Why?
A: Archaeopteryx has some avian characters and some reptilian characters. Hence it is called so.

Q: What is pyramid of biomass?
A: A graphical representation designed to show the quantity of living matter at each tropic level in a given ecosystem is called ‘pyramid of biomass’.

Q: What is sustainable development?
A: When we use the environment in ways that ensure we have resources for the future, it is called sustainable development.

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