Chart & Stethoscope

BIOLOGY NEET - 2020
SOLUTIONS

Q1. Which of the following is not an attribute of a population?

1. Sex ratio

2. Natality

3. Mortality

4. Species interaction

4. Species interaction

Q2. The process of growth is maximum during

1. Log phase

2. Lag phase

3. Senescence

4. Dormancy

1. Log phase

Q3. The roots that originate from the base of the stem are

1. Fibrous roots

2. Primary roots

3. Prop roots

4. Lateral roots

1. Fibrous roots

Q4. Match the following diseases with the causative organism and select the correct option.
Column-I
a. Typhoid
b. Pneumonia
c. Filariasis
d. Malaria

Column-II
i. Wuchereria
ii. Plasmodium
iii. Salmonella
iv. Haemophila

1. a (i) b (iii) c (ii) d (iv)

2. a (iii) b (iv) c (i) d (ii)

3. a (ii) b (i) c (iii) d (iv)

4. a (iv) b (i) c (ii) d (iii)

2. a (iii) b (iv) c (i) d (ii)

Q5. In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?

1. ZIFT and IUT

2. GIFT and ZIFT

3. ICSI and ZIFT

4. GIFT and ICSI

1. ZIFT and IUT

Q6. Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.

1. The gene (I) has three alleles

2. A person will have only two of the three alleles

3. When IA and IB are present together, they express same type of sugar.

4. Allele ‘i’ does not produce any sugar.

3. When IA and IB are present together, they express same type of sugar.

Q7. Choose the correct pair from the following

1. Ligases - Join the two DNA molecules

2. Polymerases - Break the DNA into fragments

3. Nucleases - Separate the two strands of DNA

4. Exonucleases - Make cuts at specific positions within DNA

1. Ligases - Join the two DNA molecules

Q8. Select the correct match

1. Haemophilia – Y linked

2. Phenylketonuria – Autosomal dominant trait

3. Sickle cell anaemia – Autosomal recessive trait, chromosome-11

4. Thalassemia – X linked

3. Sickle cell anaemia – Autosomal recessive trait, chromosome-11

Q9. Match the following columns and select the correct option.

Column-I
a. Gregarious, polyphagous pest
b. Adult with radial symmetry and larva with bilateral symmetry
c. Book lungs
d. Bioluminescence

Column-II
i. Asterias
ii. Scorpion
iii. Ctenoplana
iv. Locusta

1. a (i) b (iii) c (ii) d (iv)

2. a (iv) b (i) c (ii) d (iii)

3. a (iii) b (ii) c (i) d (iv)

4. a (ii) b (i) c (iii) d (iv)

2. a (iv) b (i) c (ii) d (iii)

Q10. The infectious stage of Plasmodium that enters the human body is

1. Trophozoites

2. Sporozoites

3. Female gametocytes

4. Male gametocytes

2. Sporozoites

Q11. Identify the substances having glycosidic bond and peptide bond, respectively in their structure

1. Chitin, cholesterol

2. Glycerol, trypsin

3. Cellulose, lecithin

4. Inulin, insulin

4. Inulin, insulin

Q12. The plant parts which consist of two generations - one within the other
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule

1. (a) only

2. (a), (b) and (c)

3. (c) and (d)

4. (a) and (d)

4. (a) and (d)

Q13. The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are

1. Ammonia alone

2. Nitrate alone

3. Ammonia and Oxygen

4. Ammonia and Hydrogen

4. Ammonia and Hydrogen

Q14. Identify the correct statement with regard to G1 phase (Gap 1) of interphase.

1. DNA synthesis or replication takes place.

2. Reorganization of all cell components takes place.

3. Cell is metabolically active, grows but does not replicate its DNA.

4. Nuclear Division takes place.

3. Cell is metabolically active, grows but does not replicate its DNA.

Q15. Cuboidal epithelium with brush border of microvilli is found in

1. Lining of intestine

2. Ducts of salivary gland

3. Proximal convoluted tubule of nephron

4. Eustachian tube

3. Proximal convoluted tubule of nephron

Q16. Which of the following statements about inclusion bodies is incorrect?

1. They are not bound by any membrane

2. These are involved in ingestion of food particles

3. They lie free in the cytoplasm

4. These represent reserve material in cytoplasm

2. These are involved in ingestion of food particles

Q17. Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells?

1 Endoplasmic reticulum

2. Peroxisomes

3. Golgi bodies

4. Polysomes

3. Golgi bodies

Q18. In gel electrophoresis, separated DNA fragments can be visualized with the help of

1. Acetocarmine in bright blue light

2. Ethidium bromide in UV radiation

3. Acetocarmine in UV radiation

4. Ethidium bromide in infrared radiation

2. Ethidium bromide in UV radiation

Q19. Identify the wrong statement with reference to transport of oxygen

1. Binding of oxygen with haemoglobin is mainly related to partial pressure of O2

2. Partial pressure of CO2 can interfere with O2 binding with haemoglobin

3. Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin

4. Low pCO2 in alveoli favours the formation of oxyhaemoglobin

3. Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin

Q20. Ray florets have

1. Inferior ovary

2. Superior ovary

3. Hypogynous ovary

4. Half inferior ovary

1. Inferior ovary

Q21. The specific palindromic sequence which is recognized by EcoRI is

1. 5' - GAATTC - 3'
3' - CTTAAG - 5'

2. 5' - GGAACC - 3'
3' - CCTTGG - 5'

3. 5' - CTTAAG - 3'
3' - GAATTC - 5'

4. 5' - GGATCC - 3'
3' - CCTAGG - 5'

1.
5' - GAATTC - 3'
3' - CTTAAG - 5'

Q22. Identify the wrong statement with regard to Restriction Enzymes.

1. Each restriction enzyme functions by inspecting the length of a DNA sequence.

2. They cut the strand of DNA at palindromic sites.

3. They are useful in genetic engineering.

4. Sticky ends can be joined by using DNA ligases.

4. Sticky ends can be joined by using DNA ligases.

Q23. Which of the following is put into Anaerobic sludge digester for further sewage treatment?

1. Primary sludge

2. Floating debris

3. Effluents of primary treatment

4. Activated sludge

4. Activated sludge

Q24. Select the correct events that occur during inspiration.
a. Contraction of diaphragm
b. Contraction of external inter-costal muscles
c. Pulmonary volume decreases
d. Intra pulmonary pressure increases

1. (a) and (b)

2. (c) and (d)

3. (a), (b) and (d)

4. only (d)

1. (a) and (b)

Q25. If the head of cockroach is removed, it may live for few days because

1. The supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen

2. The cockroach does not have nervous system.

3. The head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body

4. The head holds a 1/3rd of a nervous system while the rest is situated along the dorsal part of its body.