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Questions in biology

[Terjawab] Photosynthesis is an example of A. an exothermic reaction. B. an endothermic reaction. C. a reaction that gives off heat. D. a reaction that emits energy.

[Terjawab] Fill in the missing words to complete the idea of the story. A. aorta B. inferior vena cava C. right atrium D. head E. heart F. pulmonary veins G. circulatory H. oxygen I. pulmonary arteries J. carbon dioxide K. lungs L. superior vena cava M. arteries N. left atrium O. right ventricle Hi, my name is Blad and I am a red blood cell. My buddies, the ______ and blood vessels, and I form the ______ system. Through this system I carry all sorts of nutrients and oxygen to the tissues of my town, the body, and remove ______ and other wastes from them. Inside me, there is a protein called Hemoglobin that contains iron, which is like a vehicle to transport oxygen and carbon dioxide everywhere. When I go through the ______, this protein attaches to me. With the help from my best friend the heart, I am pumped and carried all over the body through ______ to perform my duties. In a day I visit my best friend countless times and always leave through the ______, which is the main artery of the body. From the aorta I can either go north to the ______ or south to the legs, arms and other parts through arteries. As I travel through the body, the arteries become thinner and thinner and become smaller vessels called arterioles. The arterioles divide into even tinier vessels called capillaries. Since the capillaries are so tiny, it is very easy to exchange material with other cells. Through the wall of the capillaries many other nutrients can come in and go out, and I lose ______ and become blue. Through this journey around my town I see all kinds of wastes, and as I return to see my friend, the heart, I bring them with me so I can help get rid of them on my way. I always visit my friend, the brain, and my other friends around the body. When I visit my friend, the brain I return through the ______, which is the highway that returns blood from the head, neck and upper limbs. When I visit my friends from the south, I come back through the ______ highway, which returns blood from the lower parts of the body. When I arrive at the heart I go through the ______, the upper chamber of the heart. Because I am blue I have to go through the ______ after I go through the right atrium. The right ventricle pumps me to see one of my friends the lungs. To see my friend I go through ______. There my friend gives me oxygen and I become red again. Happily I go back to see my friend the heart through the ______. From there I am pumped to the left ventricle. After saying my goodbyes, I exit through the ______ aorta and I can either go to see my friends in the north or revisit my friends in the south. On my daily journey around my town called the body, I go through veins in the digestive system. As the food in breaking down into simpler proteins, carbohydrates and fats in the small intestines, they are absorbed into the blood vessels, and are pumped all over the body to spread nutrients and others.

[Terjawab] Some materials are given below: (i) Rubber (ii) Sugar (iii) Salt (iv) Cotton (v) Sponge (vi) Brick (vii) Talc powder (viii) Wood Identify the materials which are soft and insoluble in water. A. (i), (ii), (iii), (iv) and (vi) only B. (i), (iv), (v) and (vii) only C. (ii), (iii) and (viii) only D. (ii), (iii) and (vi) only

[Terjawab] Write True or False for the following statements: 1. Colourless and small petals are present in water pollinated plants. 2. Zygote is the fertilized female reproductive cell. 3. Parthenocarpic plants can produce fruits without seeds. 4. Sepals can perform photosynthesis.

[Terjawab] Why did Mendeleev reverse the order of the tellurium (Te) and iodine (I) elements?

[Terjawab] Each of the following is found in the A-band of striated muscle, except: A. Z disc B. thin filaments C. H zone D. thick filaments

[Terjawab] Which hormone triggers the kidneys to form more concentrated urine and prevent excess water loss? A. calcitonin B. oxytocin C. ADH D. PTH

[Terjawab] The shorter and longer arm of a submetacentric chromosome are referred to as ____. A. m-arm and n-arm respectively B. q-arm and p-arm respectively C. p-arm and q-arm respectively D. s-arm and l-arm respectively

[Terjawab] 1. Assertion (A): Rhododendrons found in the forests of Nilgiris have short height and small leaves. Reason (R): These adaptations help them to survive heavy winds on mountain tops. 2. Assertion (A): Cactus plants have thick and fleshy stems. Reason (R): Such adaptations help to maximise water loss. 3. Assertion (A): Cheetah reintroduction project was initiated in the year 1973. Reason (R): This project aimed to restore the declining population of cheetahs.

[Terjawab] Scientists plotted data for two animal populations on a scatterplot: Population A, which they graphed along the x-axis, and Population B, which they graphed along the y-axis. The data showed a strong negative correlation. Which of the following statements is justified? A) The rise in Population A caused the decline in Population B. B) The decline in Population B caused the rise in Population A. C) Because the correlation is negative, there cannot be causation between the two populations. D) The rise in Population A is correlated to the decline in Population B, but causation is unknown.