reproduction

Question 1

Basic event in reproduction

Answer 1

Creation of a DNA copy

Question 2

Are the cells on dividing absolutely identical to each other?

Answer 2

It depends on the accuracy of the copying reactions involved

Question 3

How does spirogyra reproduces?

Answer 3

Spirogyra breaks into smaller pieces upon maturation. The pieces or fragments grow into new individuals.

Question 4

Why cannot multicellular organisms divide cell-by-cell?

Answer 4

Complex multicellular organisms have a very high degree of organisation in their body.

Question 5

Define fragmentation

Answer 5

Fragmentation is the process of asexual reproduction in which the body of a simple multicellular organism breaks up into two or more pieces upon maturation, which subsequently grows to form completely new individual organisms.

Question 6

How does a hydra reproduce?

Answer 6

1) In hydra a bud develops as an outgrowth due to repeated cell division at one specific site.
2) The buds develop into tiny individuals and when fully mature, detach from the parent body and become new independent individuals.

Question 7

Advantages of vegetative propagation

Answer 7

1) Plants grown using this method can bear fruits and flowers earlier than those produced from seeds
2) Vegetative propagation also makes possible propagation of plants that have lost the capacity to produce seeds. E,g. banana, orange, rose,jasmine, etc,
3) All plants produced are genetically similar enough to the parent plant to have all its characteristics

Question 8

Two unisexual flowers

Answer 8

papaya and watermelon

Question 9

Two bisexual flowers

Answer 9

Mustard and Hibiscus

Question 10

Describe the parts of pistil in a flower

Answer 10

Pistil is present in the centre of flower. It is made up of three parts

1) The swollen bottom part is the ovary
2) Middle elongated part is the style
3) The terminal part which may be sticky is the stigma