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- Question
The major centre to receive, analyze and integrate information in body is
Options- A. Heart
- B. Kidney
- C. Pituitary
- D. Brain
- Correct Answer
- Brain
- 1. When more than 20% of the body weight is due to fat, the person is suffering from
Options- A. Marasmus
- B. Kwashiorkor
- C. Scurvy
- D. Obesity Discuss
- 2. A pair of contrasting characters controlling the same trait is called
Options- A. factors
- B. loci
- C. allele
- D. lineage Discuss
- 3. What is plant cell wall mainly composed of?
Options- A. Lipids
- B. Vitamin
- C. Cellulose
- D. Protein Discuss
- 4. A tetrad is made up of
Options- A. four homologous pairs of chromosomes
- B. two homologous chromosomes, each consisting of two chromatids
- C. four non-homologous chromosomes
- D. two homologous pairs of chromosomes Discuss
- 5. Both food and air travel through the
Options- A. pharynx
- B. trachea
- C. larynx
- D. alveolus Discuss
- 6. Green pigment is called
Options- A. Chlorophyll
- B. Xanthophyll
- C. Carotene
- D. Phycobillin Discuss
- 7. How many pints of blood in the human body?
Options- A. 6 - 8
- B. 10 - 12
- C. 8 - 10
- D. 5 - 7 Discuss
- 8. Biological control is to check growth of
Options- A. plants
- B. animals
- C. weeds
- D. one pest by another Discuss
- 9. AIDS is caused by the organisms which are
Options- A. bacteria
- B. fungi
- C. viruses (HTLV III)
- D. ProtoZoa Discuss
- 10. Oparin is known for his hypothesis on
Options- A. origin of species
- B. origin of life
- C. one germ one disease
- D. one gene one enzyme Discuss
Biology problems
Search Results
Correct Answer: Obesity
Correct Answer: allele
Correct Answer: Lipids
Correct Answer: two homologous chromosomes, each consisting of two chromatids
Correct Answer: pharynx
Correct Answer: Chlorophyll
Correct Answer: 10 - 12
Explanation:
Scientists estimate the volume of blood in a human body to be approximately 7 percent of body weight. An average adult body with a weight of 150 to 180 pounds will contain approximately 4.7 to 5.5 liters of blood. An average child with a body weight of 80 pounds will have approximately half the amount of blood as an adult.
The amount of blood in a human body varies, depending on factors such as age, sex, overall health and even where a person lives. For example, men tend to have more blood than women of comparable size and weight.
Interestingly, people who live at high altitudes may have up to two liters of extra blood compared to those who live at lower altitudes. Because the air at higher altitudes has less oxygen, people who live at high altitudes need extra blood to deliver the right amount of oxygen to their lungs.
We know that 1 Pint = 0.473 liters
Hence, an average amount of blood in the human body = 4.7 - 5.5 lit = 10 - 12 pints.
Correct Answer: one pest by another
Explanation:
Biological Control: This method is very effective. One pest is destroyed by another organism. For example the aphids are killed by lady beetle. The prickly pear is eradicted by cochineal insect. Here the advantage is, one does not use harmful chemicals which may get into the host plants.
Correct Answer: viruses (HTLV III)
Explanation:
AIDS: The term means Acquired Immunity Deficiency Synodrome. The virus attacks the T cells of the (white corpuscle type) blood and destroys them.
Correct Answer: origin of life
Explanation:
A. J . Oparin was the first to propose the origin of life from inorganic chemical atoms like Oxygen, Hydrogen, Nitrogen and Carbon.
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