1250+ Interesting Biology Questions Answers MCQ

Q:

Amarbel is an example of

A) parasite	B) host
C) autotroph	D) saprotroph

Answer & Explanation Answer: A) parasite

Explanation:

Amarbel is an example of parasite.

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Q:

What is the structural unit of compact bone?

A) Osteon	B) Spongy bone
C) Lamellae	D) Periosteum

Answer & Explanation Answer: A) Osteon

Explanation:

what_is_the_structural_unit_of_compact_bone1536568861.jpg image

The structural unit of compact bone is Osteons or Haverisan systems.

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Q:

Statement which is true about bacteria ?

A) All bacteria are autotrophs	B) Most of them are heterotrophs but some are autotrophs
C) All bacteria heterophs	D) All bacteria are photosynthetic

Answer & Explanation Answer: B) Most of them are heterotrophs but some are autotrophs

Explanation:

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Q:

Source of infection in diseases like Tuberculosis, Mumps and Whooping cough is

A) Direct contact	B) Droplets of saliva
C) Carrier organism	D) A vector

Answer & Explanation Answer: B) Droplets of saliva

Explanation:

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Q:

DNA can be found in what Organelles?

A) Chloroplasts and Mitichondria	B) Nucleus and Ribosomes
C) Ribosomes and Mitochondria	D) Endoplasmic Reticulum and Nucleus

Answer & Explanation Answer: A) Chloroplasts and Mitichondria

Explanation:

DNA can be found in 3 Organelles namely Nucleus, Mitochondria in animals and Chloroplasts in plants.

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Q:

A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc x AaBbCc, the phenotypic ratio of the offsprings was observed as 1 : 6 : m : 20 : m : 6 : 1. What is the value of m?

A) 10	B) 15
C) 18	D) 24

Answer & Explanation Answer: B) 15

Explanation:

Here crossing is AaBbCc x AaBbCc

As it is trihybrid cross,

we know, Number of zygotes formed = $4^{n}, where n = 3$

$4^{3} = 64$

Given ratio of offsprings = 1 : 6 : m : 20 : m : 6 : 1

Now, 1 + 6 + m + 20 + m + 6 + 1 = 64

34 + 2m = 64

2m = 30

=> m = 15.

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Q:

Succus Entericus is the name given to

A) Intestinal juice	B) Appendix
C) A junction b/w ileum and large intestine	D) None of the above

Answer & Explanation Answer: A) Intestinal juice

Explanation:

Succus Entericus is the other name for the for the digestive intestinal juice secreted by the duodenum.

Succus_Entericus_is_the_name_given_to1558073828.png image

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Q:

Vitamin present in guava fruits

A) Vitamin - A	B) Vitamin - B
C) Vitamin - C	D) Vitamin - D

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