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- Question
Food wrapped in news paper is likely to get contaminated by
Options- A. Magnesium
- B. Alluminium
- C. Lead
- D. Copper
- Correct Answer
- Lead
ExplanationIt gets contaminated by lead
- 1. The rate of heartbeat is accelerated by the harmone
Options- A. adrenaline
- B. acetylcholine
- C. thyroxine
- D. pituitrin Discuss
- 2. The biogenetic law was proposed by
Options- A. Alfred Russel Wallace
- B. Charles Darwin
- C. Ernst von Haeckel
- D. Lamarck Discuss
- 3. Which of the following plays an important part in photosynthesis?
Options- A. Chloroplast
- B. Centrosome
- C. Tonoplast
- D. Nematoblast Discuss
- 4. Cretinism is due to the disorder of the glands
Options- A. Thymus
- B. Parathyroid
- C. Thyroid
- D. Adrenal Discuss
- 5. In electro - magnetic radiation, which of the following has greater wave - length than visible light
Options- A. Ultra -violet rays
- B. Infra - red rays
- C. Cosmic rays
- D. x-rays Discuss
- 6. In which of the following kind of organisms is the phenomenon found where in the female kills the male after copulation __________
Options- A. Drgonfly
- B. Honey bee
- C. Spider
- D. Pit viper Discuss
- 7. Which of the following is not an Endocrine Gland?
Options- A. Spleen
- B. Pituitary
- C. Thyroid
- D. Adrenal Discuss
- 8. What holds the sides of the DNA ladder together?
Options- A. Polar covalent bonds
- B. Ionic bonds
- C. Metallic bonds
- D. Covalent bonds Discuss
- 9. Which of the following statements best describes nutrient density?
Options- A. Consume a variety of foods from MyPyramid's ±ve major food groups every day.
- B. Consume foods that have the most nutrition for their kcalories
- C. Choose a number of diFerent foods within any given food group rather than the same old thing.
- D. All the above Discuss
- 10. Select the correct statement about the Heart Valves.
Options- A. Aortic and pulmonary valves control the flow of blood into the heart.
- B. The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
- C. The tricuspid valve divides the left atrium from the left ventricle.
- D. The mitral valve separates the right atrium from the right ventricle. Discuss
Biology problems
Search Results
Correct Answer: adrenaline
Explanation:
The hormone adrenaline also called epinephrine is known as a stress harmone. In emotional upset (like fear, anger etc.) this harmone is poured into the blood and it accelerates heart beat. The hormone acetylcholine decelerates heartbeat rate.
Correct Answer: Ernst von Haeckel
Explanation:
The biogenetic law states that ontogeny (study of development) repeats phylogeny (origin from previous group of racial history), The young one of the frog namely the tadpole is like a fish cosidered to be ancestral to frog.
Correct Answer: Chloroplast
Explanation:
The Chloroplast contains the wonder green pigment chlorophyll which is able to trap solar energy and use it for synthesis of food
Correct Answer: Thyroid
Explanation:
Cretinism is a disease caused by hypothyroidism (less thyroxine formation) . The symptoms of the disease are retardation of mental, physical and sexual developments. potbelly, protruding tongue, dry skin etc are also indicative of this disease.
Correct Answer: Infra - red rays
Correct Answer: Spider
Correct Answer: Spleen
Explanation:
Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct.
The major glands of the endocrine system include the
pineal gland,
pituitary gland,
pancreas,
ovaries,
testes,
thyroid gland,
parathyroid gland,
hypothalamus and
adrenal glands.
Correct Answer: Covalent bonds
Explanation:
Deoxyribose, which is a pentose, and a phosphate group are the two molecules together form the two sides of the DNA i.e, A sugar (deoxyribose) and a phosphate.
DNA is a double-stranded molecule twisted into a helix (think of a spiral staircase). Each spiraling strand, comprised of a sugar-phosphate backbone and attached bases, is connected to a complementary strand by non-covalent hydrogen bonding between paired bases. The bases are adenine (A), thymine (T), cytosine (C) and guanine (G). A and T are connected by two hydrogen bonds. G and C are connected by three hydrogen bonds.
Correct Answer: Consume foods that have the most nutrition for their kcalories
Explanation:
Consume foods that have the most nutrition for their kcalories describes the Nutrient Density.
Correct Answer: The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
Explanation:
The correct statement from the given options is
The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
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