Read the following passage and answer the questions that follow:
“Mosquitoes are drastically affecting human health in almost all developing tropical countries. Different species of mosquitoes cause fatal diseases, leading to loss of life or reduced productivity. Consequently, the health index of these countries suffers.”
(a) Name the form in which Plasmodium gains entry into (1) human body (2) the female {Anopheles} body.
Read the following passage and answer the questions that follow:
“Mosquitoes are drastically affecting human health in almost all developing tropical countries. Different species of mosquitoes cause fatal diseases, leading to loss of life or reduced productivity. Consequently, the health index of these countries suffers.”
(a) Name the form in which Plasmodium gains entry into (1) human body (2) the female {Anopheles} body.
Show Hint
Solution and Explanation
(1) Sporozoite – The infective stage that enters the human body.
(2) Gametocytes – The stage that enters the mosquito during a blood meal.
Top Questions on Structure and Development of Seed and Fruit
- Expression of different genes for different traits may show dominance, incomplete dominance, or co-dominance. Write about expression of such genes with examples for one of the above modes.
[0.5cm]- CBSE CLASS XII - 2024
- Biology
- Structure and Development of Seed and Fruit
- (ii) State the role of ‘rop’ gene.
- CBSE CLASS XII - 2024
- Biology
- Structure and Development of Seed and Fruit
- (ii) Endosperm development precedes embryo development. Justify.
- CBSE CLASS XII - 2024
- Biology
- Structure and Development of Seed and Fruit
- (b) (i) With the help of a labeled diagram, show the different stages of embryo development in a dicot plant.
- CBSE CLASS XII - 2024
- Biology
- Structure and Development of Seed and Fruit
- (b) In a human female, probability of an ovum to get fertilized by more than one sperm is impossible. Give reason.
- CBSE CLASS XII - 2024
- Biology
- Structure and Development of Seed and Fruit
Questions Asked in CBSE CLASS XII exam
- A reaction is of second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is (i) doubled, (ii) reduced to half?
- CBSE CLASS XII - 2025
- Order of Reaction
Rupal, Shanu and Trisha were partners in a firm sharing profits and losses in the ratio of 4:3:1. Their Balance Sheet as at 31st March, 2024 was as follows:
(i) Trisha's share of profit was entirely taken by Shanu.
(ii) Fixed assets were found to be undervalued by Rs 2,40,000.
(iii) Stock was revalued at Rs 2,00,000.
(iv) Goodwill of the firm was valued at Rs 8,00,000 on Trisha's retirement.
(v) The total capital of the new firm was fixed at Rs 16,00,000 which was adjusted according to the new profit sharing ratio of the partners. For this necessary cash was paid off or brought in by the partners as the case may be.
Prepare Revaluation Account and Partners' Capital Accounts.- CBSE CLASS XII - 2025
- Partnership Accounts
- Explain giving three reasons why tropics show greatest levels of species diversity.
- CBSE CLASS XII - 2025
- Biodiversity
- The element of dilemma, between humanity and patriotism, elevates the character of Dr. Sadao in ‘The Enemy’. Support your answer with evidence from the text.
- CBSE CLASS XII - 2025
- Literature
- Find: \[ \frac{dy}{dx}, \quad \text{if} \quad y = x \tan x + \frac{\sqrt{x^2 + 1}}{2} \]
- CBSE CLASS XII - 2025
- Differentiation