Fill in the blanks

The arrangement of leaves on stem is called

Plants which flower irrespective of the day length are called plants.

Select the correct answer (word)

Ethylene/Cytokinin is used for ripening of fruits.

The wall around the synergids is incomplete/complete.

State whether the following statements are True or False

Anomalous secondary growth in species of Chenopodium results from accessory cambium.

Aril is also known as the third integument.

2. Define any five of the following technical terms

Senescence

Incompatibility

Phototropism

Cleistogamy

Totipotency

Albuminous seed

Double fertilization

3. Write short notes on any two of the following:

Secondary growth

Applications of tissue culture technique

Seed appendages

Root apex

With the help of labelled diagrams describe the development of male or female gametophyte.

What are the two types of branching and what are the advantages of each?

OR

What is dormancy Which two parts of a plant exhibit dormancy What are the advantages of dormancy?

What is meant by durability of wood? What characteristics determine the durability of wood Do monocots also show secondary growth?

In what ways is the endosperm of gymnosperms different from that of the angiosperms?

OR

Describe the types of endosperm development in angiosperms.

There are two tea plants. If you cut off the apical buds of one of them, what difference will you observe in the growth of the two
plants, and why?

Mention any four techniques which have been responsible for revealing the fine structural details of reproductive structures of plants.

Draw a labelled diagram to show the parts of a typical dicotyledonous seed.

Name and describe the structure of tissues which provide nourishment to the following:

microspores

megaspore

embryo

Define anyone of the following:

Primary Embryonic Induction in case of amphibians

Neoteny

Expand the following terms used in developmental biology

PTG

ZPA

ICM

TSH

Differentiate between any two of the following:

Invagination and Involution

Holoblastic and Meroblastic cleavage

Totipotency and Pleuropotency

9. Discuss the three different phases of spermatogenesis

10. What are fate maps? How are they prepared?

11. Diagrammatically explain the movements involved in the formation of an amphibian gastrula.

12. What do you understand by the term regeneration Briefly explain the different types of regeneration.

13. Explain the complete metamorphosis in endopterygote insect.

14. Write short notes on any two of the following:

Stages of carcinogenesis

Implantation in humans

Functions of extra-embryonic membranes of humans

Primary egg envelope of mammals