Explain what is meant by metastasis.
Solution and Explanation
Top Questions on Human health and disease
- Transplantation of tissues/organs to some patients often fails due to rejection by the body of the patient. Which type of immune response is responsible for such rejections?
- CBSE CLASS XII - 2025
- Biology
- Human health and disease
Study a part of life cycle of Plasmodium given below:
Answer the following questions:
(a) Name the infective stage of Plasmodium that is stored in the female Anopheles mosquito.
(b) Where does fertilization and development of parasite take place?
(c) Identify labels P and Q in the given diagram.
(d) Asexual and sexual phase of the life cycle of the Plasmodium takes place in two different hosts. Write their names.- CBSE CLASS XII - 2025
- Biology
- Human health and disease
- (A) How are morphine and heroin related? Mention their effect on the human body.
- CBSE CLASS XII - 2025
- Biology
- Human health and disease
- If a person is positive in Widal test, then that person is infected by which pathogen?
- CBSE Compartment XII - 2025
- Biology
- Human health and disease
- In which of the following conditions/diseases is there a substantial increase in the activity of mast cells observed in the human body?
- CBSE Compartment XII - 2025
- Biology
- Human health and disease
Questions Asked in CBSE CLASS XII exam
- Two coils ‘1’ and ‘2’ are placed close to each other as shown in the figure. Find the direction of induced current in coil ‘1’ in each of the following situations, justifying your answers:
(a) Coil ‘2’ is moving towards coil ‘1’.
(b) Coil ‘2’ is moving away from coil ‘1’.
(c) The resistance connected with coil ‘2’ is increased keeping both the coils stationary.
- CBSE CLASS XII - 2025
- Electromagnetic induction
Bittu and Chintu were partners in a firm sharing profit and losses in the ratio of 4 : 3. Their Balance Sheet as at 31st March, 2024 was as follows:
On 1st April, 2024, Diya was admitted in the firm for \( \frac{1}{7} \)th share in the profits on the following terms:- (i) New profit sharing ratio between Bittu, Chintu and Diya was 3 : 3 : 1 .
- (ii) Fixed Assets were found to be overvalued by ₹ 1,40,000.
- (iii) Creditors were paid ₹ 4,20,000 in full settlement.
- (iv) Diya brought proportionate capital and ₹ 5,60,000 as her share of goodwill premium by cheque.
Prepare Revaluation Account and Partners' Capital Accounts.
- CBSE CLASS XII - 2025
- Partnership Accounts
- Pass the necessary journal entries for the following transactions on the dissolution of a partnership firm of Vibha and Ajit after various assets (other than cash) and external liabilities have been transferred to Realisation Account:}
Creditors worth ₹ 46,000 accepted ₹ 9,000 cash and furniture of ₹ 32,000 in full settlement of their claim.
The firm had stock of ₹ 20,000. Ajit took over 40% of the stock at a discount of 10% while the remaining stock was sold for ₹ 18,000.
Vibha was appointed to look after dissolution work for which she was allowed a remuneration of ₹ 16,000. Vibha agreed to bear the dissolution expenses. Actual dissolution expenses ₹ 15,000 were paid by Vibha.
Ajit’s loan of ₹ 45,000 was settled at ₹ 42,000.
A machine which was not recorded in the books was taken over by Vibha at ₹ 23,000, whereas its expected value was ₹ 28,000.
The firm had a debit balance of ₹ 20,000 in the Profit and Loss Account on the date of dissolution.- CBSE CLASS XII - 2025
- Dissolution of Partnership Firms
- How does the process of Natural Selection affect Hardy-Weinberg equilibrium? Explain with the help of graphs.
- CBSE CLASS XII - 2025
- evolution
- A battery of emf \( E \) and internal resistance \( r \) is connected to a rheostat. When a current of 2A is drawn from the battery, the potential difference across the rheostat is 5V. The potential difference becomes 4V when a current of 4A is drawn from the battery. Calculate the value of \( E \) and \( r \).
- CBSE CLASS XII - 2025
- Current electricity
Concepts Used:
Cancer
Cancer is a term used to derive the diseases caused due to cellular irregularities. The disease can begin in any of the trillion cells that form the human body. When these cells get old or damaged, then they die and are replaced by new cells. However, this process is deranged when cancer arises. When cells should die, they live on, and new cells grow when they aren't needed.
These excess cells can divide endlessly, potentially forming tumors. Changes in genes that hold how our cells function, particularly how they grow and split, cause cancer. Accelerating cell division rates or standing in normal control can result in gene mutations. The genes sometimes cause cancer we obtain from our parents.
Types of Cancer:
There are many types of cancer. They are named for the organs or tissues where cancer evolves. Here are some categories such as;
- Carcinoma
- Sarcoma
- Melanoma
- Lymphoma and Leukaemia