Biology

Which statement is incorrect for cloning?

Options:

• A. The nucleus of a fertilized egg is replaced by the nucleus from the cell of a fully developed individual
• B. Division of a single egg into one or more separate embryos.
• C. The individual is the mirror image of the parent organism
• D. It involve methods of sexual reproduction

View Answer

D. It involve methods of sexual reproduction

Number of chromosomes in E.coli ?

Options:

• A. 1
• B. 2
• C. 4
• D. 6

View Answer

A. 1

True roots absent in_____________?

Options:

• A. ferns
• B. bryophytes
• C. gymnosperms
• D. angiosperms

View Answer

B. bryophytes

___________ are needed as a source of energy for the vital activities of the body?

Options:

• A. Calcium
• B. Iron
• C. Water
• D. Carbohydrates

View Answer

D. Carbohydrates

It is possible to date the rocks by comparing the amount of specific radioactive isotopes they contain. Which of the statement is correct in this respect?

Options:

• A. Older sediment layers have equal amount of these radioactive isotopes as that of the young ones
• B. Older sediment layers have less amount of these radioactive isotopes as that of the young ones.
• C. Older sediment layers have greater amount of these radioactive isotopes as that of the young ones.
• D. Older sediment layers did not have these radioactive isotopes

View Answer

B. Older sediment layers have less amount of these radioactive isotopes as that of the young ones.

Oxygen accounts for ____ % of totals human body mass?

Options:

• A. 65%
• B. 18%
• C. 10%
• D. 3%

View Answer

A. 65%

Sodium ions are

Options:

• A. Diffusion
• B. Passive transport
• C. Osmosis
• D. Active transport

View Answer

D. Active transport

The atoms of different elements combine with each other through ionic or covalent bonding to produce compounds this stable form is called:

Options:

• A. An organ
• B. A molecule
• C. Tissue
• D. Both a and c

View Answer

B. A molecule

An unbroken series of species arranged in ancestors to descendent sequence with each later species having evolved from one that immediately preceded it is called?

Options:

• A. Biome
• B. Phyletic lineage
• C. Community
• D. Population

View Answer

B. Phyletic lineage

Which one of them is a micro-molecule?

Options:

• A. Polysaccharide
• B. Protein
• C. Hemoglobin
• D. ATP

View Answer

D. ATP