Question

1-_____ are symbioses between roots and fungi that enhance nutrient uptake by plant roots. 
Mycorrhizae
Casparian strips
Root hairs
Endoderm cells
Root nodules

2- Which of the factors causes stomata in C3 & C4 plants to close?

 high leaf temperature
low CO₂ in the leaf
water loss
sunlight

3- Land plants are descended from: 
green algae.
cyanobacteria.
brown algae.
mosses.

4- Tracheids differ from vessels in that they: 
store water instead of transport water.
lack companion cells
lack pits.
are formed from a single cell.

Answer 1

1. Mycorrhizae

This is the association between plant roots and fungi. The association is symbiotic as both the plants and fungi derive benefit from this association.

2. Water loss

This causes stomata to  close in order to prevent further loss of water and withering of plants. All the other factors cause opening of stomata in order to cool the leaf temperature and promote photosynthesis.

3. Green algae

These are single celled autotrophs from which the present day complex multicellular plants are believed to be originated from.

4. are formed from single cells

All the other characters given are not differentiating features. These are formed from single cells whereas vessels are formed from multiple cells.

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