MOST IMPORTANT QUESTIONS ON SCIENCE SUBJECT
1.The small openings found at the lower surface of the leaves are called______
A. MicropyleB. Veins
C. Midrib
D. Stomata
2.Consider the following statements:
Assertion (A) - Food which contains proteins are called bodybuilding foods.
Reason (R) – Paneer or cheese is obtained from plants as a source of proteins.
Choose the correct option from the following:
A. Both A and R are true and R is the correct explanation for A
B. Both A and R is true but R is not the correct explanation of A
C. A is true but R is false.
D. R is true but A is false.
3.Iron, a biological nutrient found in which of the following?
A. BloodB. Hair
C. Bones
D. All of these
4.The yellow colour of urine is due to the presence of
A. bileB. lymph
C. cholesterol
D. urochrome
5.During sleep a man’s blood pressure
A. increasesB. decreases
C. remains constant
D. fluctuates
6.At a point inside a charged conductor, the
A. Potential is constantB. Electric field is zero
C. Both (A) and (B)
D. Electric field is constant
7.Why do you sprinkle the fine powder on the carrom board?
A. To remove the dryness of the boardB. To change the colour of carrom board coins
C. To reduce the friction between the coins and board
D. To shine the board
8.SONAR works on the principle of
A. Reflection of the soundB. Refraction of the sound
C. Total internal reflection of the sound
D. diffraction of the sound
9.Quinine, used to treat malaria is obtained from which part’s of the plant?
A. RootB. Leaf
C. Flower
D. Bark
10.Which gland has both exocrine and endocrine function?
A. LiverB. Thymus
C. Pancreas
D. Pituitary
###ANSWERS###
1. Ans. D. Stomata are the minute openings present on the underside of the leaves and takes part in the gaseous exchange during photosynthesis. They are surrounded by guard cells that help in the closing and opening of the stomatal pore. All other given options are inappropriate. So, the correct answer will be: The small openings found at the lower surface of the leaves are called stomata.
2. Ans. C. Paneer and cheese are dairy products obtained from the milk of cow or buffalo. They are a rich source of protein obtained from animals. They both have a fairly high level of protein and low level of lactose (the type of sugar found in milk). They supply amino acids to maintain the growth and repair of the body cells. All other given options are inappropriate.
3. Ans. A. The blood is the chief circulatory fluid in the human body. It contains an iron-containing red pigment known as haemoglobin. It is proteinaceous in nature and contains iron as an important nutrient to maintain its structure that helps in the transportation of oxygen in the human body.
4. Ans. D. Urobilin or urochrome is the chemical primarily responsible for the yellow colour of urine. It is a linear tetrapyrrole compound that, along with the related compound urobilinogen, are degradation products of the cyclic tetrapyrrole heme.
5. Ans. D. During sleep, a man’s blood pressure fluctuates. Blood pressure is normally lower at night while we are sleeping. Our blood pressure starts to rise a few hours before you wake up. Our blood pressure continues to rise during the day, usually peaking in the middle of the afternoon. Then in the late afternoon and evening, Our blood pressure begins dropping again.
6. Ans. C. In a charged conductor potential is constant and the electric field is zero.
7. Ans. C. Friction is caused by the irregularities on the two surfaces in contact. To reduce this friction between the carrom board and its coins we sprinkle the fine powder on the carrom board. It also helps to slip the coins easily onboard.
8. Ans. A. SONAR, sound navigation and ranging works in the principle of reflection of the sound.
9. Ans. D. Quinine was the first effective Western treatment for malaria caused by Plasmodium falciparum, appearing in therapeutics in the 17th century. Quinine occurs naturally in the bark of the cinchona tree, though it has also been synthesized in the laboratory.
10. Ans. C. The pancreas is a glandular organ in the upper abdomen, but really it serves as two glands in one: a digestive exocrine gland and a hormone-producing endocrine gland. Functioning as an exocrine gland, the pancreas excretes enzymes to break down the proteins, lipids, carbohydrates, and nucleic acids in food. Functioning as an endocrine gland, the pancreas secretes the hormones insulin and glucagon to control blood sugar levels throughout the day.
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