Class 12th Biology 2016 Set2 Delhi Board Paper Solution
Differentiate between somaclones and somatic hybrids. Give one example of each.
Somaclones: These are produced through micro-propagation or tissue culture. They are genetically identical to the parent plant, e.g., apple, tomato or banana.
Somatic hybrids: These are produced by fusion of protoplast of two different plants. They are genetically dissimilar e.g., Pomato (hybrid of potato and tomato).
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(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.
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Recently Viewed Questions of Class 12th biology
- Q:-
Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of male and female gametes is called _____________.
(i) Fertilisation takes place in _____________.
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides vascular connection between fetus and uterus is called ____________. - Q:- If the sequence of the coding strand in a transcription unit is written as follows:
5-ATGCATGCATGCATGCATGCATGCATGC-3
Write down the sequence of mRNA. - Q:- Using various resources such as your school library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal say horse.
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(a) Amoebiasis
(b) Malaria
(c) Ascariasis
(d) Pneumonia - Q:-
What is meant by monosporic development of female gametophyte?
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