91.

Plasmodesmata connections help in

• cytoplasmic streaming

• synchronous mitotic divisions

• locomotion of unicellular organism

• movement of substances between cells

The quiescent centre in root meristem serves as a

• site for storage of food which is utilized during maturation

• reservoir of growth hormones

• reserve for replenishment of damaged cells of the meristem

• region for absorption of water

Assertion : Water and mineral uptake by root hairs from the soil occurs through apoplast until it reaches endodermis.

Reason : Casparian strips in endodermis are suberized

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

• If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

In a dicotyledonous stem, the sequence of tissues from the outside to the inside is

• phellem - pericycle - endodermis - phloem

• phellem - phloem - endodermis - pericycle

• phellem - endodermis - pericycle - phloem

• pericycle - phellem - endodermis - phloem

Casparian strips are present in :

• cortex

• epidermis

• endodermis

When does a plant wilt?

• When phloem is blocked

• When xylem is blocked

• Pith is removed

• A few leaves are removed

In the following pairs, where do you get lignin in both the element?

• Tracheid and collenchyma

• Sclerenchyma and sieve tube

• Sclerenchyma and trachea

• Parenchyma and endodermis

One of the characteristic of sieve tube is

• it is a part of phloem

• function is transport of inorganic solutes

• it is dead cell

• sieve plate is not present

Pith is absent in

• protostele

• eustele

• amphiphloic stele

• ectophloic stele

Quiescent centre is found in plants at

• root tip

• cambium

• shoot tip

• leaf tip