BIOLOGY 1 Marks Question

1. Monocotyledon, 2. Dicotyledon.

1. Food, 2. Medicines.

The maximum height of Eucalyptus tree is more than 100 meters.

In angiosperms, pollen grains and ovules develop as a special structure, which is called a flower

1. Cycas, 2. Pinus.

Two types of spores are formed in Salvinia- 1. Macro (large), 2. Micro (small).

From the point of view of evolution, the first plants to grow on land are ferns in which vascular tissue- xylem and phloem are found.

The sporophyte is differentiated into a foot, seta and capsule.

Asexual reproduction in liverworts takes place by fragmentation of thalli, or by the formation of specialised structures called gemmae.

(i) It is used as fuel. (ii) It is used in packing.

Some species of Sphagnum provide peat.

The male reproductive organ is called Antheridium and the female reproductive organ is called Archegonium.

Bryophytes are also called amphibians of the plant kingdom.

Asexual reproduction takes place by pear-shaped zoospores with two flagella.

Brown algae are mainly found in marine habitats.

Due to the effectiveness of chlorophyll a and b. their colour is like green grass.

Members of Chlorophyceae are often called green algae.

Chlorella algae are used as food by astronauts.

Chlorella and Spirulina algae contain abundant amounts of protein.

Agar obtained from Geladium and Gracilaria is used in culture of microorganisms and in making ice cream.

Porphyra, Laminaria and Sargassum species are used as food.

Algae fix about half of the total CO₂ during photosynthesis on Earth.

An example of anisogamous reproduction is Eudorina.

Kelp is a giant algae.

In algae, vegetative reproduction takes place through fragmentation.

He suggested natural classification. This classification was suggested on the basis of natural relationships among organisms and external properties as well as internal properties, such as structure, body, embryology and phytochemistry.

Linnaeus gave artificial classification. In artificial classification, physical and sexual characteristics were given equal recognition. But this is not right. This classification was based on fewer characteristics; they separated very closely related species.

Plantae include algae, bryophyte, pteridophyte, gymnosperm and angiosperm plant groups.