EasyBiologyHigh School (11–12)Diversity of Living Organisms › Gymnosperms and AngiospermsConceptualBoard Exam
Arjun grows three seedlings. Seedling A comes up with two seed leaves and later grows leaves with a…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Arjun grows three seedlings. Seedling A comes up with two seed leaves and later grows leaves with a network of veins. Seedling B comes up with one seed leaf and has a tuft of fibrous roots. Seedling C has leaves with parallel veins. Classify each one.
Need a reminder? The key ideaShow
In angiosperms, ovules lie inside an ovary. The embryo sac has 7 cells and 8 nuclei: the egg, 2 synergids, 3 antipodals and the central cell with 2 polar nuclei. One pollen tube brings two male gametes. Syngamy (gamete and egg) gives the zygote, . Triple fusion (gamete and two polar nuclei) gives the primary endosperm nucleus, .
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Seedling A. Two cotyledons and net veins: a dicotyledon.
Step 2. Seedling B. One cotyledon and fibrous roots: a monocotyledon.
Step 3. Seedling C. Parallel veins are a feature of monocotyledons, so C is very likely a monocotyledon.
Answer: A is a dicotyledon; B and C are monocotyledons.
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