Assertion: Hemichordata was earlier considered as subphylum under phylum chordata. But now it is placed as a separate phylum under non-chordata.
Reason: Hemichordates have open type of circulatory system and indirect development.

Hemichordata was carlier considered as a subphylum under phylum-Chordata. But now, it is placed as a separte phylum under

The phylum which was earlier considered as a subphylum under chordata but now placed as a separate phylum, in non-chordates is

The phylum which was earlier considered as a subphylum under chordata but now placed as a separate phylum, in non-chordates is

Phylum Hemichordata was considered as sub-Phyluym of Chordata. Give reason.

Which of the following statement is incorrect about the phylum Hemichordata ? (A) They are bilaterally symmetrical, triploblastic and coelomate animals. (B) Circulatory system is open type. (C) Excretory organ is proboscis gland (D) Fertilization is internal and development is indirect

Read the following passages carefully and answer the questions that follow. There was a time when the aged were revered in India as symbols of tradition, respect, wisdom and experience. They controlled and guided the destinies of all the members of joint families. Urbanisation and industrialisation has led to the breaking up of the joint family system. The disintegration of joint families has had an adverse impact on the elderly people. Many elderly people get neglected because of the nuclear set up of families. The aged are now viewed as a useless and non-productive entity. Modernisation has led to the degradation of their status and authority. Their existence as integral part of the family is now uprooted. With the decline in their functional position as the head of the family, they have lost their authority, respect and prestige they used to command earlier. The changing values and the dependence of the aged on their sons and daughter in-law has complicated the problems. The aged are marginalised, alienated and left out of mainstream, Neglect, lack of respect, verbal taunts, inter-actional stress and increasing gap in communication make the aged feel unwanted and unpleasant entities. The only peaceful place for these weak, sad and depressed people in the evening of their life are the homes of the aged. Under the existing circumstances, the need for old age homes has certainly increased and they have become a must for the elderly to lead a peaceful and happy life among those who share and care for them. The only peaceful place left for the aged is