12
Q:

Deficiency of which minerals causes goiter?

A) Magnesium B) Calcium
C) Iodine D) Sulphur

Answer:   C) Iodine



Explanation:

Deficiency of Iodine cause Goiter also called Enlarged Thyroid. It doesn't give any pain but difficult to swallow and breath are its causes.

Subject: Biology
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Q:

Which of the following transports water from the roots of the plant to its leaves?

A) Xylem B) Phloem
C) Both xylem and phloem D) Cortex
 
Answer & Explanation Answer: C) Both xylem and phloem

Explanation:
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Q:

Which of the following disease is caused by female Anopheles mosquito?

A) Chicken Pox B) Malaria
C) Black Fever D) Cholera
 
Answer & Explanation Answer: C) Black Fever

Explanation:
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Q:

Which one of the following statements is correct?

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
 
Answer & Explanation Answer: A) 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.

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Q:

Which one of the following statements regarding haemoglobin is correct?

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.
 
Answer & Explanation Answer: B) 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.

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Q:

Which one of the following has a bilateral symmetry in its body organization?

A) Asterias B) Sea anemone
C) Nereis D) Euchinus
 
Answer & Explanation Answer: A) Asterias

Explanation:

Asterias 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.

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Q:

Which one of the following organisms is dependent on saprophytic mode of nutrition?

 

A) Agaricus B) Ulothrix
C) Riccia D) Cladophora
 
Answer & Explanation Answer: A) 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.

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Q:

Which one of the following tissues is responsible for increase of girth in the stem of a plant?

A) Tracheid B) Pericycle
C) Intercalary meristem D) Lateral meristem
 
Answer & Explanation Answer: D) 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.

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Q:

Which one of the following functions is not carried out by smooth endoplasmic reticulum?

A) Transport of materials B) Synthesis of lipid
C) Synthesis of protein D) Synthesis of steroid hormone
 
Answer & Explanation Answer: C) 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.

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