Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

1. Match the microbes listed under Column-A with the products mentioned under Column-B.

	Column-A		Column-B
(a)	Penicillium notatum	(i)	Statin
(b)	Trichoderma polysporum	(ii)	Ethanol
(c)	Monascus purpurea	(iii)	Antibiotic
(d)	Saccharomyces cerevisiae	(iv)	Cyclosporin-A

2. Why does ‘Swiss Cheese’ develop large holes?

Define biodiversity Name the two most biodiversity rich zones of India.

Suggest and explain any three Assisted Reproductive Technologies (ART) to an infertile couple.

In a Mendelian monohybrid cross, the F₂ generation shows identical genotypic and phenotypic ratios. What does it tell us about the nature of alleles involved? Justify your answer.

What are the Assisted Reproductive Techniques practised to help infertile couples? Describe any three techniques.

Answer the following questions:
How do human males with ‘XXY’ abnormality suffer?

Can you suggest a method to remove oil (hydrocarbon) from seeds based on your understanding of rDNA technology and chemistry of oil?

Fill in the missing stages in the given primary hydrarch succession.
Phytoplankton → (a) → (b) → (c) → Submerged free-floating → (d) → Forest plant stage.
What is common between hydrarch and xerarch succession?

Rahul introduced Ronit to his uncle and told him that Ronit is pursuing a course in biotechnology in America.
His uncle had never heard of this term earlier and was curious to know about this term. Ronit pointed towards a big tree at the base of which were present numerous tumour-like structures and said that this is the example of natural biotechnology:

1. What is biotechnology?
2. How these crown gall tumours are formed?
3. What are the values shown by Rahul's uncle?