Question

1. Circulatory system in Cephalochordates is:
a) Well developed, closed, with a heart &
lacks a respiratory pigment
b) Poorly developed, open, with a heart
& lacks a respiratory pigment
c) Well developed, open, with a heart
and lacks a respiratory pigment
d) Weil developed, closed, without a heart
and lacks a respiratory pigment
2. Integumentary gland secreting tears is:
a) Mammary glands
b) Sebaceous glands
c) Lacrymal glands
d) Uropygeal gland
3.which of the following layer is formed at last during gastrulation?
a)ectoderm
b)mesoderm
c)endoderm
d)trophoblast​

Answer 1

Circulatory System: Tunicates have an open circulatory system. Blood flows through large tissue spaces or blood channels in the tissues. ... Lancelets have a closed circulatory system that resembles one of a primitive fish. There is no heart, blood cells, or hemoglobin.

tunicates have a well-developed heart and circulatory system. The heart is a double U-shaped tube situated just below the gut. The blood vessels are simple connective tissue tubes, and their blood has several types of corpuscle. The blood may appear pale green, but this is not due to any respiratory pigments, and oxygen is transported dissolved in the plasma. Exact details of the circulatory system are unclear, but the gut, pharynx, gills, gonads, and nervous system seem to be arranged in series rather than in parallel, as happens in most other animals. Every few minutes, the heart stops beating and then restarts, pumping fluid in the reverse direction.

5.0

Answer 2

Answer:

Explanation:

1. Circulatory system in cephalochordates is well developed, closed with a heart & lacks respiratory pigment

2.  Integumentary gland secreting tears is Lacrymal glands .

3. Ectoderm.