Human Reproduction — BIOLOGY STD 12 Science — Question

Differentiate between albuminous and non-albuminous seeds, with an example for each.

Name the type of immunity that is present at the time of birth in humans. Explain any two ways by which it is accomplished.

Complete the following table using alphabets (a to k)

DNA triplet 3’ → 5’	mRNA codon 5’ → 3’	Anticodon	Amino acid
a	b	UAC	c
d	UGG	e	Tryptophan
AAG	f	g	h
i	j	GAC	k

State the difference between simple stirred-tank bioreactor and sparged stirred-tank bioreactor. What are the advantages of these bioreactors?

Why are cyanobacteria considered useful in paddy fields?

What are the major causes of species losses in a geographical region ?

Unsing a Punnett Square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.

Explain mechanism of pollination by water in marine water plants.###Explain - mechanism of pollination by water in Zostera###Explain mechanism of pollination by water in Sea-grasses.

Why does ‘Swiss cheese’ have big holes?

Identify the odd one out in each of the following sets:

1. Rete testis, vas deferens, isthmus, epididymis.
2. Seminal vesicles, ampulla, prostate, bulbourethral glands.