1. primary spermatocytes
2. secondary spermatocytes
3. spermatids
4. spermatogonia
1. | The total amount of purine nucleotides and pyrimidine nucleotides is not always equal |
2. | There are two strands, which run parallel in the 5' → 3’ direction |
3. | The proportion of adenine in relation to thymine varies with the organism |
4. | There are two strands, which run antiparallel - one in 5' → 3’ direction and the other in 3’→ 5’ |
Consider the following four measures (A.D) that could be taken to successfully grow chickpeas in an area where bacterial blight disease is common:
(A) | spray with Bordeaux mixture |
(B) | control of the insect vector of the disease pathogen |
(C) | use of only disease-free seeds |
(D) | use of varieties resistant to the disease |
Which two of the above measures can control the disease?
1. B and C
2. A and B
3. C and D
4. A and D
1. lignified thick walls
2. cohesion and adhesion
3. weak gravitational pull
4. transpiration pull
1. parathormone
2. thyroxine
3. calcitonin
4. Both 1 and 3
1. | grasslands | 2. | agro-ecosystems |
3. | oceans | 4. | forests |
1. Dryopteris
2. Salvinia
3. Adiantum
4. Equisetum
1. Chorion
2. Allantois
3. Yolk sac
4. Amnion