Question

Give reasons for the following:-

(i) Animals like sponges and hydra do not have circulatory system

(ii) Most of the fruit plants are grown by grafting

(iii) Humans are ureotelic in nature.​

Answer 1

Answer:

1...Question.... Animals like sponges and hydra do not have circulatory system??

Answer....Animals such as sponges and Hydra do not posses any circulatory system. The water in which they live brings food and oxygen as it enters their bodies. The water carries away waste materials and carbon dioxide as it moves out. Thus, these animals do not need a circulatory fluid like the blood.

2... Question....Most of the fruit plants are grown by grafting??

Answer....The most common method of propagating fruit trees, suitable for nearly all species, is grafting onto rootstocks. This in essence involves physically joining part of a shoot of a hybrid cultivar onto the roots of a different but closely related species or cultivar, so that the two parts grow together as one plant.

Answer 2

Answer:

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