Class 12th Biology 2014 Set3 Delhi Board Paper Solution
Question 22
(a) Name the tropical sugar cane variety grown in South India. How has it helped in improving the sugar cane quality grown in North India?
(b) Identify 'a', 'b' and 'c' in the following table:
| No | Crop | Variety | Insect Pests |
| 1 | Brassica | Pusa Gaurav | (a) |
| 2 | Flat bean | Pusa Sem 2 Pusa sem 3 |
(b) |
| 3 | (c) | Pusa Sawani Pusa A-4 |
Shoot and fruit borer |
Answer
(i) The tropical sugarcane variety grown in Southern India is Saccharum officinarum which has a thicker stem and high sugar content; however, it cannot grow in Northern India. Saccharum barberi is a natively grown in Northern India.
These two varieties were crossed to get the desirable qualities of both (higher sugar content, thicker stem and the ability to grow in Northern India).
(ii)
| No | Crop | Variety | Insect Pests |
| 1 | Brassica | Pusa Gaurav | Aphids |
| 2 | Flat bean | Pusa Sem 2 Pusa sem 3 |
Jassids and fruit borer |
| 3 | Okra (Bhindi) | Pusa Sawani Pusa A-4 |
Shoot and fruit borer |
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:- Describe the structure of a seminiferous tubule.
- Q:- What is oogenesis? Give a brief account of oogenesis.
- 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:- Draw a labeled diagram of male reproductive system.
- Q:- What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.
- Q:- What is oogenesis? Give a brief account of oogenesis.
- Q:- Identify each part in a flowering plant and write whether it is haploid (n) or diploid (2n).
(a) Ovary _______________
(b) Anther _______________
(c) Egg _________________
(d) Pollen__________________
(e) Male gamete _______________
(f ) Zygote ___________________ - 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:- Is sex education necessary in schools? Why?
- Q:- The species diversity of plants (22 per cent) is much less than that of animals (72 per cent). What could be the explanations to how animals achieved greater diversification?
- Q:- What are sacred groves? What is their role in conservation?
- Q:- How is biodiversity important for ecosystem functioning?
- Q:- Can you think of a situation where we deliberately want to make a species extinct? How would you justify it?