5. A net like nervous system is present in A) Planaria B) Hydra Sponge ) Eanworm

Question

5. A net like nervous system is present in A) Planaria B) Hydra Sponge ) Eanworm 6. Malpighian tubules are excretory organs present in A) annelids B) insects C) flat worms D) echinoderms 7. An interspecific interaction neutral to one and useful to other species A) competition B) predation C) commensalism D) mutualism 8. The hollow ball of cells with inner mass is A) Blastula B) blastocyst eastrulaD morula 9. Sewage and fertilizer runoffs result in rapid growth of cyanobacteria and alge called A) symblosits B) eutrophication ) stratification D) biomagnification A) symbiosis B) eutrophication )stratification D) biomagnification 10. Increase of DDT in great lakes food web is 11. Fertilization takes place in Almra

Explanation / Answer

5) The correct option is B. Hydra.

The nervous system of Hydra is a nerve net. It connects sensory photoreceptors and touch-sensitive nerve cells, which are present in the body wall and tentacles.

6) The correct option is B. Insects.

Malpighian tubule is a unique excretory organ of insects. It removes nitrogenous wastes from the hemolymph. It also plays a role in the process of osmoregulation.

7) The correct option is C. Commensalism.

It is an interaction between two organisms in which one benefits and the other is neutral or neither benefit nor harm.

8) The correct option is B. Blastocyst.

The blastocyst is a structure, which is formed during early development. It possesses an inner cell mass and later it forms the embryo.

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