Biology Questions

Q:

Antisnake venom is prepared by 

A) Pasteur institute B) Hoffkine's institute
C) Birla's Institute D) Indian science Institute
 
Answer & Explanation Answer: B) Hoffkine's institute

Explanation:

Antisnake venom: In the Hoffkine Institute at Bombay snake venom in mild dose is injected into horses and the horses are induced to produce anti-venom bodies. These are extracted and used in cases of snake bites.

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Q:

Select the correct statement contrasting gametophytes and sporophytes.

A) Sporophytes are diploid, whereas gametophytes are haploid. B) Sporophytes are vascular, whereas gametophytes are nonvascular.
C) Sporophytes are larger than gametophytes. D) All of the above
 
Answer & Explanation Answer: A) Sporophytes are diploid, whereas gametophytes are haploid.

Explanation:

Sexual reproduction results in gametes that combine two cells from different individuals. Meiosis also produces gametes. Haploids contain one set of chromosomes in each of their cells. Diploids cells contain two chromosome sets. For plants, haploid and diploid cells divide via mitosis. The plants’ haploid phase is called the gametophyte, and the diploid phase is called the sporophyte.

 

Sporophytes are diploid plants that use meiosis to produce spores. These spores are haploid cells that grow into haploid gametophytes. Megaspores grow into female gametophytes, and microspores grow into male gametophytes.

 

Gametophytes are haploid plants that use mitosis to make haploid gametes. These gametes are female in the form of an ovum (egg) or male in the form of sperm.

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2 3101
Q:

Closely stacked flattened sacs (plants only)

A) Vacuoles B) Lysosomes
C) Golgi apparatus D) None of the above
 
Answer & Explanation Answer: C) Golgi apparatus

Explanation:
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Q:

Melvin calvin got Noble Prize for his studies on

A) Light reaction B) Plant hormones
C) Carbon fixation D) Photons
 
Answer & Explanation Answer: C) Carbon fixation

Explanation:
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Q:

Bone strength in later life depends on

A) the formation of dense bones during youth B) the increased calcium absorption in the elderly
C) the increased production of estrogen after menopause D) reducing physical activity to protect bones
 
Answer & Explanation Answer: A) the formation of dense bones during youth

Explanation:
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1 3091
Q:

Which of the following is an Autoimmune disease?

A) Systematic lupus erythematosus B) Acute anaphylaxis
C) Farmer's lung D) A heart attack
 
Answer & Explanation Answer: A) Systematic lupus erythematosus

Explanation:

An autoimmune disease is a condition in which your immune system mistakenly attacks your body.

 

The immune system normally guards against germs like bacteria and viruses. When it senses these foreign invaders, it sends out an army of fighter cells to attack them. Normally, the immune system can tell the difference between foreign cells and your own cells.

 

In an autoimmune disease, the immune system mistakes part of your body — like your joints or skin — as foreign. It releases proteins called autoantibodies that attack healthy cells. Some autoimmune diseases target only one organ. Type 1 diabetes damages the pancreas. Other diseases, like lupus, affect the whole body.

 

Hence, Systematic lupus erythematosus is an autoimmune disease that affects multiple organs.

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3 3086
Q:

Organisms that feed on the excreta of other organisms are called 

A) autotrophs B) heterotrophs
C) coprophagous D) saprotrophs
 
Answer & Explanation Answer: C) coprophagous

Explanation:

The word coprodaeum refers to the last part of the elimentary canal.The excreta (undigested, matter) comes out of that part. So, the organisms that take in such materials are called coprophagous.

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Q:

Appetite is triggered by

A) stomach enzymes B) pancreatic enzymes
C) physiological drive D) environmental cues such as the smell or taste of food
 
Answer & Explanation Answer: D) environmental cues such as the smell or taste of food

Explanation:

Appetite is the desire to eat food, sometimes due to hunger. Appetite is triggered by environmental cues such as the smell or taste of food. Appealing foods can stimulate appetite even when hunger is absent.

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