Which of the following statements regarding gymnosperms are correct?
I. Ovules are naked - not enclosed by any ovary wall before fertilisation but seeds that develop after fertilisation are covered.
II. In all living Gymnosperms, sporophyte is dominant over the gametophyte.
III. They are hetrosporous.
IV. The male and female gametophytes do not have an independent existence.
1. I, II and III
2. I, III and IV
3. II, III and IV
4. I, II, III and IV
Which of the following algae is likely to be found in the deepest waters?
(d) All are found at equal depths
Which pair[s] is/are in incorrectly matched?
I. Phaeophyceae - Algin in cell wall
II. Chlorophyceae - Laminarin is stored food
III. Rhodophyceae - 2, unequal, lateral flagella
(1) Only II
(2) Only III
(3) I and II only
(4) II and III only
The gemmae produced by some liverworts function as:
(1) A water gathering structure
(2) A light capturing structure
(3) A sexual structure
(4) An asexual structure
All the following differentiate gymnosperms from the higher cryptogams except:
(1) Presence of an independent green gametophyte
(2) development of an ovule
(3) Formation of the pollen tube
(4) Presence of cambium
Heterosporous ferns include both:
(1) Lycopodium and Equisetum
(2) Selaginella and Salvinia
(3) Psilotum and Phylloglossum
(4) Selaginella and Equisetum
The life cycle is not haplo-diplontic in:
Asexaul reproduction by pear shaped biflagellate zoospores is seen in most:
1. Green algae
2. Brown algae
3. Red algae
4. Both (2) and (3)
All the following pteriodophytes belong to the Class Pteropsida except:
Sexual reproduction by non-flagellated but similar in size gametes is seen in: