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

Following are the features of genetic codes. What does each one indicate?
Stop codon; Unambiguous codon; Degenerate codon; Universal codon.

Certain molecular processes are given in column (A). Provide the terms given to these processes in column (B), after selecting them from the terms:
Recombination, gene regulation, prokaryotic transcription, eukaryotic transcription, translation, replication, gene transfer, DNA fingerprinting

S.No.	Column A	Column B
(i)	DNA → DNA
(ii)	DNA → hRNA
(iii)	mRNA → Protein
(iv)	Repressor Protein + Operator → No  transcription

Female reproductive organs and associated functions are given below in column A and B. Fill in the blank boxes.

Column A	Column B
Ovaries	Ovulation
Oviduct	A
B	Pregnancy
Vagina	Birth

What are allergens? How do human beings respond to them?

Write short notes on :
(a) Innate immunity
(b) Allergy
(c) Carcinogenes
(d) Withdrawal syndrome
(e) Endoparasitic Protozoans

List the three parameters used for constructing ecological pyramids. Describe any one instance where the pyramid may look inverted.

Explain the Importance of microrganism in the production of enzymes and other bioactive molecules.

Banana is a parthenocarpic fruit, whereas oranges showpolyembryony. How are they different from each other with respect to seeds?

Distinguish between primary sludge and activated sludge.

Why are adolescents especially advised not to smoke? How does smoking affect the functioning of the body?