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- Question
What is plant cell wall mainly composed of?
Options- A. Lipids
- B. Vitamin
- C. Cellulose
- D. Protein
- Correct Answer
- Lipids
- 1. 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
- 2. Both food and air travel through the
Options- A. pharynx
- B. trachea
- C. larynx
- D. alveolus Discuss
- 3. Which parts of the heart receive blood from the lungs?
Options- A. Right ventricle
- B. Left Atrium
- C. Left Ventricle
- D. Right ATrium Discuss
- 4. Goosebumps are caused by contractions of the
Options- A. Muscles
- B. Nerves
- C. Bones
- D. All of the above Discuss
- 5. Which process requires cellular energy?
Options- A. Passive transport
- B. Active transport
- C. Both A & B
- D. None of the above Discuss
- The Sodium-Potassium pump,
- Exocytosis, and
- Endocytosis.
- 6. A pair of contrasting characters controlling the same trait is called
Options- A. factors
- B. loci
- C. allele
- D. lineage Discuss
- 7. 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
- 8. The major centre to receive, analyze and integrate information in body is
Options- A. Heart
- B. Kidney
- C. Pituitary
- D. Brain Discuss
- 9. Green pigment is called
Options- A. Chlorophyll
- B. Xanthophyll
- C. Carotene
- D. Phycobillin Discuss
- 10. How many pints of blood in the human body?
Options- A. 6 - 8
- B. 10 - 12
- C. 8 - 10
- D. 5 - 7 Discuss
Biology problems
Search Results
Correct Answer: two homologous chromosomes, each consisting of two chromatids
Correct Answer: pharynx
Correct Answer: Left Atrium
Correct Answer: Muscles
Correct Answer: Active transport
Explanation:
Active transport is a method of transport of ions or molecules along the cell membrane in the cell from lower to higher concentration region and which needs cellular energy.
There are three main types of Active Transport. They are:
Correct Answer: allele
Correct Answer: Obesity
Correct Answer: Brain
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.
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