Among bitter gourd, mustard, brinjal, pumpkin, china rose, lupin, cucumber, sunn hemp, gram, guava, bean, chilli, plum, petunia, tomato, rose, Withania, potato, onion, aloe and tulip how many plants have hypogynous flower?

The complex formed by a pair of synapsed homologous chromosomes is called:

Which one of the following statements is correct?

1. Sporogenous tissue is haploid

2. Endothecium produces the microspores

3. Tapetum nourishes the developing pollen

4. Hard outer layer of pollen is called intine

A major site for synthesis of lipids is:
1. SER
2. Symplast
3. Nucleoplasm
4. RER

Select the correct statement with respect to locomotion in humans:

A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is:

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics: 

Which of the following are correctly matched with respect to their taxonomic classification?

Figure shows a schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function/s. 

The most abundant intracellular cation is:
1. Ca²⁺
2. H⁺
3. K⁺
4. Na⁺