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- Question
Which one of the following has a bilateral symmetry in its body organization?
Options- A. Asterias
- B. Sea anemone
- C. Nereis
- D. Euchinus
- Correct Answer
- Asterias
ExplanationAsterias has bilateral symmetry only at larval stagebut fivefold symmetry (pentamerism, a special type of radial symmetry) as adults.
Nereis do not possess any symmetry elements in their body organisation.
- 1. Which one of the following organisms is dependent on saprophytic mode of nutrition?
Options- A. Agaricus
- B. Ulothrix
- C. Riccia
- D. Cladophora Discuss
- 2. Which one of the following tissues is responsible for increase of girth in the stem of a plant?
Options- A. Tracheid
- B. Pericycle
- C. Intercalary meristem
- D. Lateral meristem Discuss
- 3. Which one of the following functions is not carried out by smooth endoplasmic reticulum?
Options- A. Transport of materials
- B. Synthesis of lipid
- C. Synthesis of protein
- D. Synthesis of steroid hormone Discuss
- 4. Synapse gap is present between which of the following?
Options- A. Two neurons
- B. Brain and Spinal Cord
- C. Two Kidneys
- D. None of these Discuss
- 5. Biological catalysts are protein molecules which 1. speed up a chemical reaction 2. remain unchanged after reaction 3. function optimally at 37 deg C. 4. do not have an enzymatic activity Select the correct answer using the code given below.
Options- A. 1 only
- B. 1, 2 and 3
- C. 2 and 3 only
- D. 1, 3 and 4 Discuss
- 6. Which one of the following statements regarding haemoglobin is correct?
Options- A. Haemoglobin present in RBC can carry only oxygen but not carbon dioxide
- B. Haemoglobin of RBC can carry both oxygen and carbon dioxide
- C. Haemoglobin of RBC can carry only carbon dioxide
- D. Haemoglobin is only used for blood clotting and not for carrying gases. Discuss
- 7. Which one of the following statements is correct?
Options- A. Urea is produced in liver
- B. Urea is produced in blood
- C. Urea is produced from digestion of starch
- D. Urea is produced in lung and kidney Discuss
- 8. Which of the following disease is caused by female Anopheles mosquito?
Options- A. Chicken Pox
- B. Malaria
- C. Black Fever
- D. Cholera Discuss
- 9. Which of the following transports water from the roots of the plant to its leaves?
Options- A. Xylem
- B. Phloem
- C. Both xylem and phloem
- D. Cortex Discuss
- 10. Kyoto Protocol is associated with
Options- A. Species conservation
- B. Climate change
- C. Wetland Conservation
- D. Medicinal plants Discuss
Biology problems
Search Results
Correct Answer: Agaricus
Explanation:
Saprophytic fungi feed on dead plant and animal remains. Many are extremely beneficial, breaking down this organic material into humus, minerals and nutrients that can be utilised by plants. Agaricus is one among them.
Correct Answer: Lateral meristem
Explanation:
In vascular plants, the lateral meristem is one of two meristems in which growth occurs in order to increase stem girth. A meristem is the region of plant tissue found on the tips of roots and shoots. It is where cell division occurs to produce new growth.
Correct Answer: Synthesis of protein
Explanation:
Smooth Endoplasmic Reticulumdoes not contain ribosomes on its surface for which it is regarded as smooth. So, proteins cannotbe synthesised by SER provided protein synthesis is the primary task of ribosomes.
Correct Answer: Two neurons
Correct Answer: 1, 2 and 3
Explanation:
Enzymes are biological catalysts. Enzymes are the catalysts involved in biological chemical reactions.
A fundamental task of proteins is to act as enzymes?catalysts that increase the rate of virtually all the chemical reactions within cells.
A catalyst remains chemically unchanged itself at the end of a reaction.
Each enzyme has a temperature that it works optimally in, which in humans is around 98.6 degrees Fahrenheit, 37 degrees Celsius ?the normal body temperature for humans.
Correct Answer: Haemoglobin of RBC can carry both oxygen and carbon dioxide
Explanation:
During respiration, about 97% of oxygen is transported by Red Blood Cells in blood and the remaining 3% gets dissolved in the plasma.Around 20-25% of carbon dioxide is carried by haemoglobin as carbamino-haemoglobin.
Oxygen enters the blood from the lungs and carbon dioxide is expelled out of the blood into the lungs. The blood serves to transport both gases. Oxygen is carried to the cells. Carbon dioxide is carried away from the cells.
Correct Answer: Urea is produced in liver
Explanation:
Urea is produced in the liver and is a metabolite (breakdown product) of amino acids. Ammonium ions are formed in the breakdown of amino acids. Some are used in the biosynthesis of nitrogen compounds. Excess ammonium ions are converted to urea.
Correct Answer: Black Fever
Correct Answer: Both xylem and phloem
Correct Answer: Climate change
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