Question

Apply the characters of Deuterostomes and relate the characters with their nature and form a complete paragraph.

Deuterostomes:

1). Cleavage of the zygote is___i___ and intermediate.

2). During embryonic development, the other opening of the digestive system is

formed first into and the mouth is formed later, anterior to the

blastopore and blastopore into___ii___.

3). Coelom is developed as an ___iii___of archenterons.

4). Mesoderm is derived from wall of developing ___iv___.

5). Nerve cord is ___v___ in position

6). Cell fate is determined at a very ___vi___ stage

• A. i - radial, ii - anus, iii - dorsal, iv - gut, v - outpouching, vi - last.
• B. i - radial, ii - anus, iii - dorsal, iv - outpouching, v - gut, vi - last.
• C. i - gut, ii - anus, iii - dorsal, iv - radial, v - outpouching, vi - last.
• D. i - gut, ii - anus, iii - dorsal, iv - outpouching, v - radial, vi - last.

Answer 1

The correct option is A

i - radial, ii - anus, iii - dorsal, iv - gut, v - outpouching, vi - last.

Deuterostomes:

Cleavage of the zygote is radial and intermediate. During embryonic development, the other opening of the digestive system is formed first, and then mouth is formed, anterior to the blastopore and blastopore into anus. Coelom is developed as an outpouching of archenterons. Mesoderm is derived from wall of developing gut. Nerve cord is dorsal in position. Cell fate is determined at a very last stage.

Hence : A = i - radial, ii - anus, iii - dorsal, iv - gut, v - outpouching, vi - last.