Biology Questions

Q:

Only movable bone in the skull

A) Occipital bone B) Frontal bone
C) Mandible D) Temporal bone
 
Answer & Explanation Answer: C) Mandible

Explanation:

The skul contains the bones like Occipital bone, Frontal bone, Mandible, Temporal bone, Parietal bone. The mandible, or jaw bone, is the only movable bone of the skull, forming the temporomandibular joint with the temporal bone. The lower teeth are rooted into the mandible while the upper teeth are rooted in the two maxillae.

 

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Q:

Agrostology is the study of

A) Seed of oil B) Crop
C) Grass D) Fruits
 
Answer & Explanation Answer: C) Grass

Explanation:
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Q:

Is a mushroom an autotroph?

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

Mushrooms are heterotrophs. They are not plants or autotrophs.


 


Every living thing that exists need energy in order to live. This energy ultimately comes from the sun, and only plants, or autotrophs, can directly use this energy to make food. Those organisms that cannot harness the sun's energy are known as heterotrophs.


 


Mushrooms belong to kingdom Fungi and are heterotrophs because they decompose and consume nutrients from the soil. They are not green so they cannot photosynthesize



For this reason, mushrooms and all other fungi are heterotrophs.

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Q:

Which of the following cells do not contain nucleus?

1. Root hair cells

2. Red blood cells

3. Platelets

4. Monocytes

Select the correct answer using the code given below.

A) 1 only B) 2 and 3 only
C) 1, 2 and 4 D) 2, 3 and 4
 
Answer & Explanation Answer: B) 2 and 3 only

Explanation:

The absence of a nucleus is an adaptation of the red blood cell for its role. It allows the red bloodcell to contain more haemoglobin and, therefore, carry more oxygen moleculesLike red cells, platelets (thrombocytes) have no nucleus.Monocytes have a small spherical nucleus and has abundant dark staining condensed chromatin.There are 5 organelles found in a root hair cell. They are the: nucleus, cytoplasm, cell membrane, cell wall and vacuole.

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Q:

Which part of Nervous system controls involuntary actions

A) Medulla oblongata B) Cerebellum
C) Hypothalamus D) Spinal cord
 
Answer & Explanation Answer: A) Medulla oblongata

Explanation:
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Q:

Which of the following is a mixed gland

A) Pituitary B) Adrenal
C) Pancreas D) Ovary
 
Answer & Explanation Answer: C) Pancreas

Explanation:
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Q:

Silviculture is the branch of botany in which we study about

A) Culture of algae B) Development of forest
C) Culture of fungi D) Silciphida plant
 
Answer & Explanation Answer: B) Development of forest

Explanation:
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Q:

The rate of heartbeat is accelerated by the hormone 

A) adrenaline B) acetylcholine
C) thyroxine D) pituitrin
 
Answer & Explanation Answer: A) adrenaline

Explanation:

The hormone adrenaline also called epinephrine is known as a stress hormone. In emotional upsets( like fear, anger etc.) this hormone is poured into the blood and it accelerates heart beat. The hormone acetylcholine decelerates heartbeat rate.

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