What are benign and malignant tumours ?

Difference between:Benign Tumour and Malignant Tumour.

Assertion : Benign tumours are called neoplastic cells. Reason : Malignant tumour remain in place to form a compact mass by a process known as metastasis.

Which one of the following statements is correct ? (a) Benign tumours spread to distant sites. (b) Heroin accelerates body functions. (c) Malignant tumours exhibit metastasis. (d) Patients who have undergone surgery are given cannabinoids to relieve pain.

Read the following statements carefully. (i) Cancer causing viruses have genes called viral oncogenes. (ii) Malignant tumors remain confined to their original location. (iii) Cancer cells do not exhibit contact inhibition. (iv) X-rays and UV rays are not potent carcinogens. (v) Cancer detection is based on biopsy. Which of the above statements are not correct regarding cancer ?

Read the following statements and select the correct option. Statement 1 : Malignant tumors normally remain confined to their original location, do not spread to other body parts and cause less damage. Statement 2 : Cancer arising from epithelial tissues of internal organs and glands is referred to as sarcoma e.g., breast cancer, cervical cancer etc.

What are sigma and pi-bond's ? What is the bond angle and shape of the methane molecule ?