NEET UG Model Questions – Page 14

Following are model questions from Ecology and Genetics topics of Biological Sciences. These model questions will be useful for practice for EAMCET Medical and NEET – UG examinations.

1. Assertion (A): Exchange of gases in some hydrophytes takes place directly through the thin cell walls by the process of diffusion.
Reason (R): Stomata are totally absent in submerged hydrophytes like Salvinia and Ceratophyllum.

1) (A) and (R) are correct. (R) explains (A).
2) (A) and (R) are correct. (R) do not explains (A).
3) (A) is correct. (R) is false.
4) (A) is false. (R) is correct.

2. Select (one plant from each list) two plants belonging to the same habitat.
List – I List – II
A. Utricularia M. Ranunculus B. Wolffia N. Typha
C. Sagittaria O. Hydrilla D. Cyperus P. Vallisnaria E. Potamogeton Q. Salvinia

The correct pairs are:

1) A-N, B-Q, C-O, D-P, E-M
2) A-O, B-Q, C-M, D-N, E-P
3) A-P, B-M, C-O, D-Q, E-N
4) A-Q, B-N, C-P, D-M, E-O

3. Arrange the following statements or definitions in a sequence which are related to Warming, Reiter, Odum, Tansley.

A. The study of plants and animals in reciprocal relationship with their environment is called Ecology.
B. Structural and functional unit of nature.
C. The study of structure and function of nature is Ecology.
D. The study of organisms in relation to their environment is called Ecology.

1) C D B A 2) A D C B 3) B D C A 4) D A C B

4. Community is a group of organisms of –
1) different species of same characters
2) same species of different organisms living in same area
3) Different species occuring in the same area
4) Different characters of different species occuring in different areas

5. Assertion (A): Autogamy and Geitonogamy are not possible in submerged, fixed hydrophyte with long, ribbon shaped leaves.
Reason: (R): Sporophytes and gametophytes are dioecious in it.

1) (A) and (R) are correct. (R) explains (A).
2) (A) and (R) are correct. (R) do not explains (A).
3) (A) is correct. (R) is false.
4) (A) is false. (R) is correct.

6. One of the following character is not associated with rooted hydrophyte with floating simple largest leaves.
1) Long petioles 2) Epistomatic 3) Aerenchyma in leaves only 4) The stem is rhizome or reduced

7. Arrange the following hydrophytes in ascending order basing on the efficiency of root system.
A. Hydrilla B. Sagittaria C. Plant with dissected leaves D. Pistia E. Salvinia
1) EACDB 2) CAEBD 3) BAECD 4) CEADB

8. A hydrophyte with monarch condition do not bears the following character.
1) Green roots 2) Pulvinus petiole 3) Cuticle on the stem 4) Adventitious roots

9. Match the following
List – I : List – II

A. Xylem cavity I. A plant that shows superficial placentation
B. Submerged II. Hydrophyte with dissected leaves long, linear leaves
C. Rhizome III. Hydrilla stem
D. Non functional IV. Hydrophyte with stomata rosette leaves
V. Limnophila

Key: 1-3; 2-2; 3-4; 4-3; 5-1; 6-3; 7-4; 8-3; 9-2

Here are some model questions useful for EAMCET, NEET – UG and JEE Main Examinations. The questions are from Organic chemistry.

1. Where C is
1) Yellow dye 2) Orange dye 3) Green dye 4) Blue dye

2. Heating of 2 – Bromo pentane with alcoholic KOH, the major product formed is
1) 1 – pentene 2) 2 – pentene 3) n – pentane n 4) Iso – pentane

3. The correct order of decreasing SN2 reactivity is
1) R2CHX > R3CX > RCH2X 2) RCH2X > R3CX > R2CHX
3) RCH2X > R2CHX > R3CX 4) R3CX > R2CHX > RCH2X

4.major product + Minor product
The major product in this reaction is
1)- o – di chloro benzene o
2) p – di chloro benzene p
3) m – di chloro benzene m
4) both 1 and 2

5. The reaction between Ethanol and PCl5 gives C2H5Cl. The role of Ethanol in this reaction is
1) Electrophile 2) Nucleophile ) both 1 and 2 4) None

6. C2H5Cl on reaction with KCN gives C2H5CN, Where as with AgCN gives C2H5NC as chief products because
1) K and Cl forms ions readily 2) AgCN,KCN are ionic 3) AgCN, KCN are covalent 4) AgCN is covalent, KCN is ionic

7. The use of product formed when CHCl3 reacts with acetone in presence of KOH is
1) hypnotic 2) somnifacient 3) saporific 4) depressant

8. Which of the following gives positive Iodoform test upon reaction with I2 and Naoh?
1) C6H5CH2CH2OH 2) C2H5CHOHC2H5 3) (CH3)2CHCH2OH 4) ph CHOHCH3

9. The alcohol that gives blue colouration in victor meyer’s test is

10. The correct order of acidity
1) C6H5OH < H2O < C2H5OH 2) C6H5OH > C2H5OH > H2O
3) C6H5OH > H2O > C2H5OH
4) C6H5OH < C2H5OH < H2O 11. (CH3)3C - Br + CH3ONa ® Main product 1) (CH3)3C - OH 2) (CH3)2C = CH2 3) C3H7 OH 4) C4H9OH KEY: 1)2 2)2 3)3 4)2 5)1 6)4 7)1 8)4 9)1 10)3 11)2

EAMCET Medical – NEET UG Biology Model Questions

EAMCET Chemistry Model Bits – Useful for NEET and JEE Main