Which class of algae has a rigid cell wall made of an inner layer of cellulose and an outer layer of pectose?
Green algae (Chlorophyceae) usually have a rigid cell wall made of an inner layer of cellulose and an outer layer of pectose.
Question 42 of 100
📘 CLASS XI
Sporophylls in some pteridophytes may form distinct compact structures called:
In pteridophytes, the sporophytes bear sporangia that are subtended by leaf-like appendages called sporophylls. In some cases, sporophylls form distinct compact structures called strobili or cones (e.g., Selaginella, Equisetum).
Question 43 of 100
📘 CLASS XI
Which gymnosperm is considered one of the tallest tree species?
One of the gymnosperms, the giant redwood tree Sequoia, is one of the tallest tree species.
Question 44 of 100
📘 CLASS XI
After fertilization in gymnosperms, the zygote develops into a(n) ________ and the ovules into ________.
Following fertilization in gymnosperms, the zygote develops into an embryo and the ovules into seeds.
Question 45 of 100
📘 CLASS XI
At least half of the total carbon dioxide fixation on earth is carried out by:
Algae are useful to man in a variety of ways. At least half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis.
Question 46 of 100
📘 CLASS XI
Which group of plants lacks true roots, stems, or leaves, but possesses root-like, leaf-like, or stem-like structures?
The plant body of bryophytes is thallus-like and lacks true roots, stem or leaves, though they may possess root-like, leaf-like, or stem-like structures.
Question 47 of 100
📘 CLASS XI
In gymnosperms, the pollen tube discharges the male gametes near the mouth of the:
The pollen tube carrying the male gametes grows towards the archegonia in the ovules and discharges their contents near the mouth of the archegonia.
Question 48 of 100
📘 CLASS XI
In which type of plants are leaves classified into microphylls and macrophylls?
The leaves in pteridophyta are small (microphylls) as in Selaginella or large (macrophylls) as in ferns.
Question 49 of 100
📘 CLASS XI
The sporophyte of liverworts is differentiated into:
In liverworts, the sporophyte is differentiated into a foot, seta, and capsule.
Question 50 of 100
📘 CLASS XI
The male sex organ in bryophytes is called ________, which produces ________ antherozoids.
The male sex organ in bryophytes is called the antheridium, and they produce biflagellate antherozoids.
