Plants with ovaries having only one or a few ovules are generally pollinated by:
1. Butterflies
2. Birds
3. Wind
4. Bees
Consider the following four statements (I-IV) and select the option which includes all the correct ones only:
| I. | Single-cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins, etc. |
| II. | Body weight-wise, the microorganism Methylophilus methylotrophus may be able to produce several times more proteins than that produced by a cow per day through its milk. |
| III. | Common button mushrooms are a very rich source of vitamin C. |
| IV. | A rice variety has been developed which is very rich in calcium. |
1. Statements (I), (III), and (IV)
2. Statements (II), (III), and (IV)
3. Statements (I), (II)
4. Statements (III), (IV)
Which one of the following biomolecules is correctly characterised?
| 1. | Palmitic acid - an unsaturated fatty acid with 18 carbon atoms |
| 2. | Adenylic acid - adenosine with a glucose phosphate molecule |
| 3. | Alanine amino acid - Contains an amino group and an acidic group anywhere in the molecule |
| 4. | Lecithin - a phosphorylated glyceride found in the cell membrane |
For its action, nitrogenase requires:
1. Light
2. Mn2+
3. Super oxygen radicals
4. High input of energy
Tobacco plants resistant to a nematode have been developed by the introduction of DNA that produced (in the host cells):
1. A particular hormone
2. An antifeedant
3. A toxic protein
4. Both sense and anti-sense RNA
Where do certain symbiotic microorganisms typically occur in the human body?
1. Oral lining and tongue surface
2. Vermiform appendix and rectum
3. Duodenum
4. Caecum
Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres.
1. Metaphase-II
2. Anaphase-I
3. Anaphase-II
4. Metaphase-I
Which one of the following cellular parts is correctly described?
| 1. | Centrioles - sites for active RNA synthesis |
| 2. | Ribosomes - those on chloroplasts are larger (80s) while those in the cytoplasm are smaller (70s) |
| 3. | Lysosomes - optimally active at a pH of about 8.5 |
| 4. | Thylakoids - flattened membranous sacs forming the grana of chloroplasts |
The supportive skeletal structures in the human external ears and the nose tip are examples of:
1. Areolar tissue
2. Bone
3. Cartilage
4. Ligament
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