Organizations in which a circulating body fluid is distinct from the fluid that

Question

Organizations in which a circulating body fluid is distinct from the fluid that directly surrounds the body's cells are likely to have a closed circulatory system branched tracheae hemolymph an open circulatory system. a gastrovascular cavity. The major branches of are the and the Bilateral. These names refer to what characteristic of these animals? embryonic cleavage types of appendages body symmetry presence or absence of a nucleus in their cells size Which structure is common to both gymnosperms and angiosperms? ovary carpel male strobilus

Explanation / Answer

6. Plants that have their flowering inhibited by being exposed to bright lights at night are short day plants. These plants require long periods of darkness with light period shorter than critical length. For example if the critical length is 11 hours , flowers will bloom only if the day length is lesser than 11 hours. Example of plants : Poinsettias, Christmas cactus.

7. Organisms with a circulating body fluid that is distinct from the fluid that directly surrounds the body’s cells are likely to have a closed circulatory system. Blood is pumped through vessels (arteries and veins) and does not fill body cavities.

8. The major branches of Eumetazoa are Radiata and Bilateria. These names refer to Body symmetry characteristic of these animals. Eumetazoans have true tissue. Animals belonging to Radiata are radially symmetrical. They can be dividend into multiple mirror images when divided through a central axis. They have a top and bottom. Bilateria are bilaterally symmetrical. They can be cut into a single plane and have a dorsal, ventral, anterior, posterior, right an dleft sides.

9. The structure common to both gymnosperms and angiosperms is ovule.

10. Calcitonin exerts an antagonistic action to PTH.

Both act to maintain the calcium levels in blood. PTH increases the calcium ion absorption in intestines and kidneys and stmulating its release from the bones while calcitonin inhibits breakdown of bone leading to decrease in calcium release in blood.

11. Except for a pseudocoelom , all the characteristics of phylum Cnidaria.

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