Forestry

The purpose of acid scarification is to modify hard

Or impermedable seed coverings

Both (a) & (b)

None of these

1871

1872

1873

1874

A basic functional ecology unit including both biotic

Abiotic component mutually adjusting with each other for the maintendance of life

Both (a) & (b)

None of these

Bates

Darwin

Lamark

Darlington

Abundant air spaces and air chambers

Plentiful xylem and sclerenchyma

Leaves having stomata only on the upper side or none

Poor development of roots

Future increment of even aged crop can be from valid yield table

Under stocked stands tend to approach fully stocked stands with increase in age, though more rapid growth than the latter

Both (a) & (b)

None of these

15%

20%

25%

30%

Mimic only

Model only

Both (a) & (b)

Either of these

The pith borer of poplars

Mostly found in KPK, Azad Kashmir and Lahore

The eggs are laid in eye-shaped slits made in young branches by ovipositing adult

All of the above

Natural

Self-pruning

Both (a) & (b)

None of these