Velamen is a specialized tissue found in

(1) aerial roots of orchids

(2) succulent leaves

(3) pneumatophores

(4) stilt roots

Coconut's husk fibre, coir of commerce is extracted from

1. epicarp

2. mesocarp

3.endocarp

4. all of these

When the filament runs throughout the length of anther, it is called

(1) adnate

(2) dorsi fixed

(3) versatile

(4) syngenesious

Which of the following is the largest root parasite?

(1) Rafflesia

(2) Areuthobium

(3) Monotrapa

(4) Pistia

The family containing mustard and its main characters are

(1) Brassicaceae - Tetramerous flowers, six stamens, bicarpellary gynoecium, siliqua type fruit.

(2) Brassicaceae - Pentamerous flowers, many stamens, pentacarpellary gynoecium, capsule type fruit

(3) Solanaceae - Pentamerous flowers, five stamens, bicarpellary gynoecium, berry type fruit

(4) Poaceae - Trimerous flowers, three stemens, monocarpellary gynoecium, caryopsis type of fruit

Velamen present in orchids helps in

(1) absorption of nutrients from host plant

(2) respiration

(3) absorption of moisture from air

(4) synthesising food

Which among the following is a rootless plant?

(1) Nymphaea

(2) Sagittaria

(3) Ceratophyllum

(4) Vallisneria

Composite fruit develops from

(1) single ovary

(2) inflorescence

(3) apocaropous ovary

(4) pericarp

Cocoa is the plant from which chocolate is made. Which part is used to extract it?

(1) Flower

(2) Fruit

(3) Seeds

(4) Bark

The cells of the quiescent centre are characterised by

(1) having dense cytoplasm and prominent nuclei

(2) having light cytoplasm and small nuclei

(3) dividing regularly to add to the corpus

(4) dividing regularly to add to tunica