Answer:
Type I survivorship curves:
Type I survivorship curves depicts the curves of the organisms that survive at middle and early stage but dies at later stage of life. Type I survivorship curve shows convex shape on graph. Example : Human.
Type II survivorship curves:
Type II survivorship curves depicts the curves of the organisms that has constant mortality rate throughout their life stages. Type II survivorship curve shows linear shape on graph. Example : Squirrel.
Type III survivorship curves:
Type III survivorship curves depicts the curves of the organism that contains the fewer individuals till adulthood. Type III survivorship curve shows concave shape on graph. Example : Fishes.
Answer:
The correct answer is both.
Explanation:
- Each chromosome is made up of a pair of sister chromatids which remain attached to each other at the centromere.
- During DNA replication the DNA duplicates, which means that if initially in the parent cell 'n' chromosomes were present then, after duplication, the number of chromosomes in the cell will be '2n'.
- As mentioned above, each chromosome has a pair of sister chromatids, that is, two chromatids per chromosome. So, 'n' chromosomes will have '2n' chromatids. Hence, '2n' chromosomes will have '4n' chromatids.
- In a parent cell,
- Before duplication, number of chromosome = n, number of chromatid = 2n.
- After duplication, number of chromosome = 2n, number of chromatid = 4n.
- The cell cycle proceeds as, G0, G1, S, G2, M.
- G0 represents the interphase. It occurs before replication or duplication of the chromosomes, which occurs in the S phase.
- So, in G0 phase, the chromosome number is 'n' and chromatid number is '2n'.
Answer:
a. Pathogen
Explanation:
A pathogen organism is the main cause of disease in another organism. In this example, beetles just carry the fungus, which is the real cause of the infection in the pines. So, beetles are vectors of the fungus. They also can be called "Reservoirs" or "hosts", and the fungus is the pathogen that produces the pine’s death.
Answer:
Because the surface of the leaf is nonpolar
Explanation:
