The earliest land plants lacked true roots. What may have enabled them the most to colonize land?

Plants of this group are diploid and well adapted to extreme conditions. They grow bearing sporophylls in compact structures called cones. The group in reference is

The giant Redwood tree (Sequoia sempervirens) is a/an

Which of the following Greek root word means "naked" and hence gives name to plants like cycas and pines?

The term ‘strobilus’ in a gymnosperm defines a:
1. collection of megasporophylls
2. collection of microsporophylls
3. site of sporangial development
4. collection of megasporophylls, microsporophylls and/or a site of sporangial development

Female sex organs of gymnosperms are called:

Unlike bryophytes and pteridophytes, in gymnosperms:
1. the male and female gametophytes do not have an independent existence
2. the vascular tissue is poorly developed
3. the reproduction is dependent on water in most cases
4. the plants bodies are clearly differentiated into root, stem and leaves

Which of the following regarding Cycas is incorrect?
1. Pinnate leaves persist for a few years
2. Male and female cones are born on different plants
3. Coralloid roots are in association with cynobacteria
4. Homosporous gymnosperm

In gymnosperms, the ovules are:

Coralloid roots in Cycas are associated with nitrogen fixing: