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Class 12 Biology Mcqs

Q:

Sexual reproduction is better than asexual reproduction.

A) False B) True
 
Answer & Explanation Answer: B) True

Explanation: Sexual reproduction is better than asexual reproduction. This is mostly because sexual reproduction brings about variation in the offspring which brings about mutations and helps it adapt to the changes in the environment. On the other hand, asexual reproduction is a fast process but the offspring that is produced has no variation which makes it difficult for it to adapt to even small changes.

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Sub Category: Class 12 Biology Mcqs

82
Q:

How does Bryophyllum reproduce?

A) Leaves B) Stem
C) Roots D) Nodes
 
Answer & Explanation Answer: A) Leaves

Explanation: Adventitious buds arise from the margin of the leaves in Bryophyllum. Those buds give rise to new plants that fall of when they are capable enough to grow on their own. This unique ability has been exploited by the gardeners and farmers.

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93
Q:

From where do rhizomes arise?

A) Roots B) Leaves
C) Buds D) Nodes
 
Answer & Explanation Answer: D) Nodes

Explanation: The site of origin in rhizomes is from nodes present in modified stems. Examples of plants that give rise to new plantlets from nodes: potatoes (the nodes on potatoes are also called nodes) and ginger.

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24
Q:

Which plant is the “terror of Bengal”?

A) Cereus B) Corpse plant
C) Water hyacinth D) Cactus
 
Answer & Explanation Answer: C) Water hyacinth

Explanation: Water hyacinth is a water weed that grows on still water. It drains out all the oxygen from the water bodies which is extremely fatal for the marine organisms. It is very difficult to get rid of them because even if leaves behind a single bud, it will start multiplying at a great speed.

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58
Q:

What is the term used to describe genetic and morphologic similarities between different individuals?

A) Offspring B) Clone
C) Gamete D) Cell
 
Answer & Explanation Answer: B) Clone

Explanation: Clones are organisms with the same genetic and morphological similarities. It can be carried out naturally and artificially. Asexual reproduction is an example of natural cloning. Artificial cloning is carried out in labs. In biotechnology cloning can refer to DNA fragments or cell copies.

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40
Q:

Reproduction is defined as a biological process of organisms giving rise to young ones or offspring.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: Reproduction is a biological process carried out by organisms in order to keep their species alive. It is a process carried out generation after generation. There are many ways of reproducing. They are divided into sexual and asexual reproduction.

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Sub Category: Class 12 Biology Mcqs

84
Q:

What is the period from birth to natural death of an organism known as?

A) Life span B) Senescence
C) Age D) Life cycle
 
Answer & Explanation Answer: A) Life span

Explanation: The period from birth to natural death of an organism is known as its life span. It varies from few years to thousand years, depending on the organism.

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