NEET SOLVED PAPER 2020 | Question 1 to 10

Neet 2020 Paper with detail Solution

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1. Chromosomal theory of inheritance was proposed by

( a ) Watson and Crick        ( b ) Sutton and Boveri
( c ) Bateson and Punnet    ( d ) T.H. Morgan .

Solution - ( b ) : Chromosomal theory of inheritance was proposed by Sutton and Boveri independently in 1902. In 1993 , T.H. Morgan confirmed the findings of Sutton and Boveri .

2. Which of the following is incorrect about Cyanobacteria ?
( a ) They have chlorophyll a similar to green plants .
( b ) They are photoautotrophs .
( c ) They lack heterocysts .
( d ) They often form blooms in polluted water bodies .

Solution - ( c ) : Cyanobacteria or blue - green algae are Gram ( + ) photosynthetic prokaryotes which perform oxygenic photosynthesis . Photosynthetic pigments include chlorophyll a , carotenoids and phycobitins . Some cyanobacteria possess special type of cells called heterocysts to perform special functions . Heterocysts are usually large sized , rounded and thick - walled cells devoid of nucleoid .

3. The impact of immigration on population density is
( a ) positive                                  ( b ) negative
( c ) both positive and negative ( d ) neutralized by natality .

Solution ( a ) : Immigration is the number of individuals of the same species that have come into the habitat from else where during the time period .

4. Which of the following statements is incorrect ?
( a ) RuBisCO action requires ATP and NADPH .
( b ) RuBisCO is a bifunctional enzyme .
( c ) In C4 plants , the site of RuBisCO activity is mesophyll cell .
( d ) The substrate molecule for RuBisCO activity is a 5 - carbon compound .

Solution - ( c ) : In C4 plants , the site of RuBisCO activity is bundle sheath cells

5. Inclusion bodies of blue - green , purple and green photosynthetic bacteria are
( a ) microtubules ( b ) contractile vacuoles ( c ) gas vacuoles ( d ) centrioles .

Solution - ( c ) : Inclusion bodies are non - living structures present in the cytoplasm . Gas vacuoles are gas storing vacuoles found in cyanobacteria , purple and green bacteria and a few other planktonic forms . A gas vacuole is without any covering of its own . It consists of a variable number of hexagonal , hollow and cylindrical gas vesicles that are surrounded by a single non - unit , non - lipid protein membrane having ribs or folds

6. Which of the following is the correct floral formula of Liliaceae ?

Solution - ( d )

7. Male and female gametophytes do not have an independent free living existence in
( a ) bryophytes ( b ) pteridophytes ( c ) algae ( d ) angiosperms .

Solution - 7. ( d )

8. In the following in each set a conservation approach and an example of method of conservation are given
( A ) in - situ conservation - Biosphere Reserve
( B ) ex - situ conservation - Sacred groves
( C ) in - situ conservation - Seed bank
( D ) ex - situ conservation - Cryopreservation

Select the option with correct match of approach and method
( a ) ( A ) and ( B )  ( b ) ( A ) and ( C )  ( c ) ( A ) and ( D )  ( d ) ( B ) and ( D )

Solution - ( c ) : In situ conservation is conservation and protection of the whole ecosystem and its biodiversity at all levels in order to protect the threatened species , e.g. , hot spots , national parks , biosphere reserves , sacred groves . Ex situ conversation is conservation of selected rare plants / animals
in places outside their natural homes . It includes off site collections and gene banks .


9 . Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to
( a ) chilling conditions ( b ) gibberellic acid  ( c ) nitrate ( d ) ascorbic acid .

Solution 9. ( d ) : Effect of inhibitory substances in dormant seeds can be removed by subjecting the seeds to chilling conditions or by application of certain chemicals like gibberellic acid and nitrates . Changing the environmental conditions , such as light and temperature are other methods to overcome seed dormancy .

10. In some plants thalamus contributes to fruit formation . Such fruits are termed as 
( a ) parthenocarpic fruits ( b ) false fruits ( c ) aggregate fruits ( d ) true fruits .

Solution - 10. ( b )

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