Practice paper

Casparian strips are the bands of thickenings present on ________ walls of endodermis

1. Aradial
2. Btangential
3. Ccentral
4. Dboth (a) & (b)

Where is jelly deposited as a covering on the egg of frog?

1. Ain the oviduct
2. Bin the water during fertilization
3. Cin the water after fertilization
4. Din the ovary

Select the incorrect pair

1. ACell wall - Structural support
2. BCentral vacuole - Storage
3. CAmyloplast - Starch storage
4. DPlasmodesmata - Protection

During karyokinesis, the spindle fibers get attached to condensing chromosome at a highly differentiated- region. This region is called as –

1. AChromomere
2. BChromocentre
3. CCentriole
4. DKinetochore

Low temperature treatment to speed up the process of flowing is referred to as –

1. APhotoperiodism
2. BVernalisation
3. CThermoperiodism
4. DHydroponics

The exchange of gases in the alveoli of the lungs takes place by

1. APassive transport
2. BActive transport
3. COsmosis
4. DSimple diffusion

Assertion (A) – The most widely used compound as source of ethylene is ethephon. Reason (R) – Ethephon hastens fruit ripening in tomatoes and apples and accelerates abscission in stems and leaves.

1. ABoth A and R are true, and R is the correct explanation of A.
2. BBoth A and R are true, and R is not the correct explanation of A.
3. CA is true, but R is false.
4. DA is False, but R is true.

Assertion (A) – Alveoli are the primary sites for exchange of gases. Reason (R) – All factors in our body are favorable for diffusion of O2 from alveoli to tissues and that of CO2 from tissues to alveoli.

1. ABoth A and R are true, and R is the correct explanation of A.
2. BBoth A and R are true, and R is not the correct explanation of A.
3. CA is true, but R is false.
4. DA is False, but R is true.