Which of these gases was/were present in prebiotic atmosphere?
Ammonia
Methane
Oxygen
Hydrogen
A.
Ammonia
B.
Methane
D.
Hydrogen
Primitive atmosphere contained gases like CO2, CO, N, H2, NH3, etc. Water vapour and metallic carbites reacted to form CH4. There was no oxygen present at that time. With the addition of O2 in the atmosphere, it became oxidising in nature and CH4 and NH3 began to disappear as they got oxidised forming CO2 and N2 respectively.
An area is declared as 'Hot Spot' when
it has 1500 or more endemic species and 75% of its original habitat is lost
it has 1500 or more vertebrate species and 75% of its original habitat is lost
it has more than 2000 species of plants
most of the species inhabiting the area is facing the risk of extinction
Select the correct combination of statements for DNA fingerprinting,
I. It is ELISA based technique.
II. It is PCR based technique.
III. It is used by forensic scientists.
IV. It is based on the fingerprint of the individual.
V. It is a test for paternity
I, II and III
II, III and IV
I, IV and V
I, III and IV
Match the items in column I with those in column II and choose the correct answer.
Column I | Column II |
A. Klinefelter syndrome | 1. Mutation in autosomal gene |
B. Thalassaemia | 2. Mutation in sex chromosome linked gene |
C. Down syndrome | 3. Trisomy of autosome |
D. Colour blindness | 4. Trisomy of sex chromosme |
A- 1; B- 2; C- 3; D- 4
A- 2; B- 3; C- 4; D- 1
A- 3; B- 4; C- 1; D- 2
A- 4; B- 1; C- 3; D- 2
Select the correct combination (s) from the followings.
Encephalitis - Viral disease
Kala-azar - Phlebotomus
Rhabditiform larvae - Ascaris
Entamoeba - Sporogony
Select the non-degradable pollutant (s) from the followings
Plastic
Organochlorine pesticides
Heavy metals
Domestic sewage
Match the following column I with column II
Column I | Column II |
A. Cytology | 1. Study of fossils |
B. Entomology | 2. Study of cells |
C. Palaentology | 3. Study of birds |
D. Ornithology | 4. Study of insects |
A- 2; B- 3; C- 4; D- 1
A- 2; B- 4; C- 1; D- 3
A- 1; B- 2; C- 4; D- 3
A- 3; B- 2; C- 1; D- 4
Select the correct statement (s) pertaining to Chipko movement.
It was led by Sunderlal Bahuguna
It was a tree hugging movement
It commenced in the Tehri-Garhwal district.
It received global attention on environmental protection.
Select the correct combination of statements regarding Myasthenia gravis.
I. It is an autoimmune disorder.
II. It causes insufficient acetylcholine binding that affects muscular contraction.
III. Antibodies are developed against acetylcholine
IV. Antibodies are developed against acetylcholine receptors.
V. Antibodies are developed against acetylcholine esterase.
VI. It causes drooping of eyelids.
I, III, IV, VI
I, II, IV, VI
I, II, IV, VI
II, III, IV, V
Match the following column I with column II.
Column I | Column II |
A. Producer | 1. Herbivores |
B. Primary consumer | 2. Green plants |
C. Secondary consumers | 3. Saprotrophs |
D. Decomposer | 4. Carnivores |
A- 1; B- 2; C- 3; D- 4
A- 2; B- 1; C- 4; D- 3
A- 2; B- 4; C- 3; D- 1
A- 3; B- 2; C- 1; D- 4