List of top Biology Questions asked in Maharashtra Class XII

Describe mutualism.

Identify and define ‘A’ and ‘B’ in relation to the uptake of water by the root: 

What are the significances of double fertilization?

Define the following terms: 
(a) Gene Flow 
(b) Chromosomal Aberrations

Enlist the uses of gene therapy.
Distinguish between human sperm and ovum.

Observe the graph and select the correct option: 

What are the reasons for the success of Mendel?
Give the name of the microbial source of the antibiotic chloromycetin.
What is the full form of IAA?
Identify the appropriate term for the number of births under ideal conditions:
Which one of the following does not evolve further?
Which of the following types require pollinator but result is genetically similar to autogamy?

Recognition sequences of restriction enzymes are generally ___________ nucleotides long. 
 

Which of the following is caused by an unsterilized needle?
Which of the following divides the nasal cavity?

In absence of fertilization, corpus luteum degenerates into __________. 
 

Which one of the following is not a part of lac operon?
Identify the growth hormone in plants which causes inhibitory effect.
What is blood pressure?
Give the name of the instrument which is used to measure the blood pressure.
Differentiate between an artery and a vein with reference to lumen and thickness of wall.

Complete the following chart regarding population interaction and re-write:

Sr. No.Name of InteractionInteraction Between
1ParasitismPlasmodium and Man
2CompetitionLeopard and Lion
3CommensalismClown Fish and Sea-anemone

 

Define – Incomplete dominance.
If a red flowered Mirabilis jalapa plant is crossed with a white flowered plant, what will be the phenotypic ratio in F2 generation? Show it by a chart.
Differentiate between X-chromosome and Y-chromosome with reference to –
length of non-homologous regions
type as per position of centromere.

Complete the following chart regarding energy flow in an Ecosystem and re-write:

CategoryExamples
Primary ConsumerHerbivores
Primary ProducerGreen Plants / Phytoplankton
Tertiary ConsumerMan, Lion
Secondary ConsumerFrog, Small Fish

 

Distinguish between heterochromatin and euchromatin with reference to staining property and activity.