AIIMS Botany Anatomy Of Flowering Plants Class 11 Questions

Hairy root disease of dicot plants is caused by-

The concept of quiescent centre was proposed by Clowes in 1961. On the basis of autoradiographic studies of DNA synthesis in the root tip of Zea, he found a reservoir of cells having low DNA, RNA and protein concentration. He called it quiescent center. They may or may not divide. It is resistant to damage.

Identify the labeled part in the given figure and select the correct option.

Pith cavity occurs in the stem of

Which of the following statement is true?

Refrigerated fruits maintain flavor and taste for longer period due to

In Krnaz anatomy, the bundle sheath cell have

What is the characteristic of tapetum?

Given figure shows

Assertion : In angiosperms, transport of food and water is more efficient than gymnosperms and pteridophytes. Reason : In angiosperms longitudinally arranged sieve elements and vessels with perforated end walls are present.

Why are vascular bundles closed in monocots?

Assertion : Cork prevents the loss of water by evaporation. Reason : Cork cells contain tannins.

Bark refers to

The branched sclereids present in hydrophytes are

Assertion (A) : In woody stems, the amount of heart wood continues to increase year after year. Reason (R) : The cambial activity continues uninterrupted.

Grafting is successful in dicots but not in monocots because the dicots have

Which one of the following statements pertaining to plant structure is correct?

The sugarcane plant has

In a plant organ which is covered by periderm and in which the stomata are absent, some gaseous exchange still takes place through

Companion cells in plants are associated with

Cork cambium results in the formation of cork which becomes impermeable to water due to the accumulation of

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

Passage cells are found in

Assertion : The collenchyma is thick walled living tissue. Reason : The collenchyma is thickened due to the deposition of pectin.

Porous wood contains:-

Coconut's Husk fibre coir of commerce is extracted from

Assertion : Stomata remain open during day. Reason : Stomata help in exchange of gases.

Assertion : Monocot stem bear collateral open vascular bundles. Reason : If cambium is absent such vascular bundles are called closed type.

A scientist wants to study the viral effects on plants. Which of the following part of the plant should he exclude?

Assertion: Vascular cambium is considered as lateral meristem. Reason: It gives rise to lateral shoots.