The type of life-cycle in which there is no free-living sporophytes and the dominant, photosynthetic phase in such plants is the free-living gametophyte. We are talking about

1.Haplontic life cycle shown in Volvox and some species of Chlamydomonas.

2.Diplontic life cycle as shown in seed-bearing plants.

3.Haplo-diplontic life cycle as shown in bryophytes and pteridophytes.

4.Haplo-diplontic life cycle as shown in Kelps.

 

Read the following statements :

A.     The male or female cones or strobili may be borne on same tree in Pinus.

B.     In Cycas male cones and megasporophylls are borne on different trees.

C.     Stem of Cycas is branched and of Pinus and Cedrus is unbranched.

D.     In gymnosperms generally tap roots are found.

Select the correct statements.

1. A, B   

2. A, B, D

3. A, B, C                                 

4. C, D

Prothallus is

1. A structure in pteridophytes formed befor4e the thallus develops.

2. A sporophytic inconspicuous free living structure formed in pteridophytes.

3. A gametophytic inconspicuous free living structure formed in pteridophytes.

4. A gametophytic conspicuous structure formed after fertilization in pteridophytes.

Leafy stage develops from the secondary protonema as a

1. Apical bud                           

2. Axillary bud

3.Lateral bud                            

4. Meristem

In Phaeophyceae, the spores (zoospores) are

1. Pyriform and bear 2 flagella (one longitudinal and other transverse).

2. Pear-shaped and bear 2 flagella that are laterally attached.

3. Pyriform and bear 2-8, equal and apial flagella.

4. Pear-shaped and bear 2-8, equal and apical flagella.

In chlorophyceae and phaeophyceae, the type of sexual reproduction is

1.Isogamous                             2.Anisogamous

3.Oogamous                             4. All of the above

Read the following statement and find out the incorrect statement.

1. Algae usually reproduce vegetatively by fragmentation, asexually by formation of different types of spores and sexually by formation of gametes.

2. Algae are classified into three classes, pteridophytes into four classes and antiosperms into two classes.

3. Algae are chlorophyll bearing simple, thalloid, autotrophic and largely aquatic organisms.

4. The plant body of algae is more differentiated than that of bryophytes.

Read the following statements (a-e) and answer question that follows them.

(a) In liverworts, mosses and ferns gametophytes are free-living.

(b) Gymnosperms and some ferns are heterosporous.

(c) Sexual reproduction in Fucus, Volvox and Albugo is oogamous.

(d) The sporophyte in liverworts in more elaborate than that in mosses.

(e) Both, Pinus and Marchantia are dioecious.

How many of the above statements are correct?

1. One     2. Two

3. Three   4. Four

Read the following statements.

(a) Gymnosperms are heterosporous.

(b) Bryophytes have well developed vessels and sieve tubes.

(c) Strobilus is found in the main plant body of Equisetum.

(d) Antheridia are absent but archegonia are present in female storobil of gymnosperms.

Choose the correct option.

1. All of these                           2. (a), (c) and (d)

3. Only (a)                                 4. (b) and (c)

Which one is correct about male and female gametophyte?

1. In bryophytes and pteridophytes, they have no independent free-living existence.

2. In bryophytes and angiosperms, they have free-living existence.

3. In gymnosperms and angiosperms, they have no independent free-living existence.

4. In bryophytes, pteridophytes and angiosperms, they have free-living existence.