1. N2 –fixation
2. Absorption
3. Transpiration
4. Fixation
N2 –fixation
1. Sessile, straight, oval
2. Sessile, straight, linear-lanceolate
3. Sessile, straight, spiny
4. Sessile, smooth, twisted
Sessile, straight, linear-lanceolate
1. Haploid
2. Diploid
3. Triploid
4. Tetraploid
Haploid
1. Rhizopus, Triticum
2. Ginkgo, Pisum
3. Acacia, Sugarcane
4. Pinus, Cycas
Ginkgo, Pisum
1. Cycas
2. Pinus
3. Pteris
4. Selaginella
Pinus
1. Normal root of Cycas
2. Coralloid root of Cycas
3. Normal root of Pinus
4. Stem of Cycas
Coralloid root of Cycas
1. There is no fruit
2. There is no ovule
3. There is no fertilization
4. There is no ovary and fruit
There is no fruit
1. Cadmium
2. Lead
3. Arsenic
4. Mercury
Mercury
1. Stamed
2. Sepal
3. Petal
4. Carpel
Carpel
1. 1982
2. 1984
3. 1986
4. 1988
1984