Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What happens to the larvae of Cyclostomes after metamorphosis?
The NCERT states, Their larvae, after metamorphosis, return to the ocean.
The body of Cyclostomes is described as:
The NCERT text specifies, They have an elongated body bearing 6-15 pairs of gill slits for respiration. Cyclostomes have a sucking and circular mouth without jaws. Their body is devoid of scales and paired fins.
Which of the following is a common feature shared by Cyclostomata and Chondrichthyes, based on the provided text?
For Cyclostomata, the NCERT states, Cranium and vertebral column are cartilaginous. For Chondrichthyes, it says, They are marine animals with streamlined body and have cartilaginous endoskeleton. Therefore, a cartilaginous endoskeleton is a shared feature. Placoid scales, ventrally located mouth, and operculum are characteristic of Chondrichthyes, not Cyclostomata.
Consider the following statements about Cyclostomata: I. They completely lack a notochord in the adult stage. II. They possess a true bony vertebral column as adults. III. They are considered the most primitive chordates. Which of the above statements is/are correct?
The NCERT states, 'The members of subphylum Vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.' While it doesn't explicitly state the notochord's persistence in Cyclostomata adults, it does specify their vertebral column is cartilaginous, not bony. More importantly, the summary states, 'Agnatha is represented by the class, Cyclostomata. They are the most primitive chordates.' This makes statement III correct. Statements I and II are incorrect as the vertebral column is cartilaginous and chordates (which vertebrates are) have a notochord during embryonic development, which is then replaced by a vertebral column (cartilaginous in cyclostomes).
Which of the following describes the primary goal of gene therapy?
Gene therapy is defined as the insertion of genes into an individual’s cells and tissues to treat diseases, especially hereditary diseases, by replacing a defective mutant allele with a functional one or through gene targeting. (NCERT, Biotechnology and its Applications)
Which type of diseases are primary targets for gene therapy according to the provided text?
Gene therapy is the insertion of genes into an individual’s cells and tissues to treat diseases especially hereditary diseases. (NCERT, Biotechnology and its Applications)
How does gene therapy primarily achieve its therapeutic effect?
Gene therapy does so by replacing a defective mutant allele with a functional one or gene targeting which involves gene amplification. (NCERT, Biotechnology and its Applications)
What common biological entities are frequently utilized as vectors to transfer healthy genes in gene therapy?
Viruses that attack their hosts and introduce their genetic material into the host cell as part of their replication cycle are used as vectors to transfer healthy genes or more recently portions of genes. (NCERT, Biotechnology and its Applications)
The manipulation of microbes, plants, and animals through biotechnology has primarily raised concerns in which area?
The current interest in the manipulation of microbes, plants, and animals has raised serious ethical questions. (NCERT, Biotechnology and its Applications)
Which of the following is NOT listed as a human disease for which transgenic models exist to aid in understanding and treatment development?
Transgenic models exist for many human diseases such as cancer, cystic fibrosis, rheumatoid arthritis and Alzheimer’s. Diabetes mellitus is mentioned in the context of insulin production but not explicitly as a disease with existent transgenic models for understanding its development. (NCERT, Biotechnology and its Applications)
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