What is the most common shape and size of pollen grain in angiosperms plants?

1. Spindle-shaped, 25-50 $\mathrm{\mu m}$

2. Spherical, 2-5 $\mathrm{\mu m}$

3. Spherical, 25-50 $\mathrm{\mu m}$

4. Spindle-shaped, 2-5 $\mathrm{\mu m}$

In flowering plants, endosperm

1. Is pre-fertilizing tissue

2. Development rarely involves free nuclear divisions

3. Development precedes embryo development

4. Is triploid tissue always

What is the possible advantage if hybrids are made into apomicts?

1. Segregation of characters in the hybrid progeny

2. Farmers can keep on using the hybrid seeds to raise new crop in first year only

3. Absence of segregation in the hybrid progeny

4. More than one option is correct 

During the development of typical embryo sac from the functional megaspore

1. The free nuclear division takes places

2. Cytokinesis is present after each karyokinesis

3. Nuclear divisions are followed immediately by cell wall formation

4. Cell walls are laid down after the 4-nucleated stage

In a typical dicotyledonous embryo, the cylindrical portion below the level of cotyledons is _________ that terminates at its lower and in the ____________

1. Epicotyl, plumule

2. Epicotyl, radicle

3. Hypocotyl, radicle

4. Hypocotyl, plumule

Pollination by water is

1. Limited to about 30 families of dicots

2. Very common in  flowering plants

3. More common in monocots than dicots

4. More common abiotic method of pollination

The lower end of the embryonal axis in maize has the radicle and root cap enclosed in

1. An extension of scutellum

2. A structure called coleoptile

3. A differentiated sheath

4. A structure called coleorrhiza

Mark the incorrect statement

1. Hybrid seeds have to be produced every year

2. Production of hybrid seeds is costly

3. If the seeds collected from hybrids are sown, the progeny do not maintain hybrid characters

4. Cultivation of hybrids has decreased productivity

Male and female plants are not separate in case of

1. Papaya and date-palm

2. Mulberry and papaya

3. Date-palm and mulberry

4. Castor and maize

In Polygonum type of embryo sac, polar nuclei

1. Are haploid

2. Can serve as a precursor of PEN

3. Occur in the large central cell

4. More than one option is correct