Class 12th Biology 2012 Set3 Delhi Board Paper Solution
Question 21
Study a part of the life cycle of malarial parasite given below. Answer the questions that follow:
(a) Mention the roles of A in the life cycle of the malarial parasite.
(b) Name the event C and the organ where this event occurs.
(c) Identify the organ B and name the cells being released from it.
Study a part of the life cycle of malarial parasite given below. Answer the questions that follow:
(a) Mention the roles of A in the life cycle of the malarial parasite.
(b) Name the event C and the organ where this event occurs.
(c) Identify the organ B and name the cells being released from it.
Answer
(a) A in the image represents the female mosquito. The female mosquito takes up the gametocytes of the malarial parasite along with the blood meal when it bites an infected person.
(b) The event 'C' is the fertilization stage and it takes place in the intestine of the mosquito.
(c) The organ 'B' is the salivary gland of the mosquito and the sporozoites escape out of the mosquito's salivary gland.
Popular Questions of Class 12th biology
- Q:- What is spermatogenesis? Briefly describe the process of spermatogenesis.
- Q:- Why is reproduction essential for organisms? Answer
- Q:- Write a short note on
(a) Adaptations of desert plants and animals
(b) Adaptations of plants to water scarcity
(c) Behavioural adaptations in animals
(d) Importance of light to plants
(e) Effect of temperature or water scarcity and the adaptations of animals. - Q:- With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.
- Q:- What is DNA fingerprinting? Mention its application.
- Q:- What is oogenesis? Give a brief account of oogenesis.
- Q:- Describe the structure of a seminiferous tubule.
- Q:- What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.
- Q:- With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
- Q:- Explain the Law of Dominance using a monohybrid cross.
Recently Viewed Questions of Class 12th biology
- Q:- Arrange the following terms in the correct developmental sequence:
- Q:- List two essential roles of ribosome during translation.
- Q:- Who had proposed the chromosomal theory of inheritance?
- Q:- What is spermatogenesis? Briefly describe the process of spermatogenesis.
- Q:- Draw a labeled diagram of a Graafian Follicle?
- Q:-
Explain the following terms with example
(a) Co-dominance
(b) Incomplete dominance - Q:- Briefly describe the following:
(a) Transcription
(b) Polymorphism
(c) Translation
(d) Bioinformatics - Q:- Distinguish between
(a) Grazing food chain and detritus food chain
(b) Production and decomposition
(c) Upright and inverted pyramid
(d) Food chain and Food web
(e) Litter and detritus
(f) Primary and secondary productivity - Q:- Depending upon the chemical nature of the template (DNA or RNA) and the nature of nucleic acids synthesised from it (DNA or RNA), list the types of nucleic acid polymerases.
- Q:- Define ecological pyramids and describe with examples, pyramids of number and biomass.