Which ofthe following is not true for a species?
Members of a species can interbreed
Variations occurs among members of a species
Each species is reproductively isolated from every other species
Gene flow does not occur between the populations of a species
D.
Gene flow does not occur between the populations of a species
Gene flow means the spread of genes through populations as affected by movements of
individual and their propagules e.g., spores, seeds etc. It ensures that all populations of a given species share a common gene pool i.e., it reduces difference between populations. The interruption of gene flow between populations is a pre-requisite for the formation of new species.
Match the following Columns.
Column I (Cell Organelle) | Column II (Discovered by) |
A. Ribosome | 1. Fontana |
B. Nucleolus | 2. Tolbert and Yamazaki |
C. Glyoxysome | 3. Palade |
D. Peroxisome | 4. Beevers |
A – 1; B – 4; C – 2; D – 3
A – 3; B – 4; C – 1; D – 2
A – 1; B – 3; C – 2; D – 4
A – 3; B – 1; C – 4; D – 2
Match items in Column- I with those in Column- II
Column- I | Column- II |
A. Peritrichous flagellation | 1. Ginkgo |
B. Living fossil | 2. Macrocystes |
C. Rhizophore | 3. Escherichia coli |
D. Smallest flowering plant | 4. Selaginella |
E. Largest perennial alga | 5.Wolffia |
Select the correct answer from the following
A B C D E
2 1 3 4 5
A B C D E
5 3 2 5 1
A B C D E
1 2 5 3 2
A B C D E
3 1 4 5 2
Calyptra develops from
Venter wall of archegonium
Outgrowth of gametophyte
Neck wall of archegonium
Paraphysis of the archegonial branch
Indian rhinoceros are protected in
Gir forest
Kaziranga National Park
Bandipur National Park
Ranthambore National Park