Biology · Science General

Botany and Plant Science

4,989 Questions

Botany and plant science delve into the biological study of plant life, covering structural anatomy, physiological processes, and reproductive mechanisms. Key topics include inflorescence patterns, root modifications, and seed development, which are vital for biology sections in medical entrance exams. This collection of practice questions helps solidify understanding of complex plant functions.

Plant ReproductionPlant AnatomyRoot ModificationsInflorescence PatternsPlant Morphology

Botany and Plant Science Questions

Multiple choice botany stem - external morphology habit of plants plant classifications type of plants

Following are the comparisons between phylloclades and cladodes (cladophylls).

Phylloclade Cladode
(i) Both main stem and branches are modified to function like leaves. Only the branches are modified to take over the function of leaves.
(ii) Phylloclade has limited or definite growth. Cladode has unlimited or indefinite growth.
(iii) It consist of several nodes and internodes.  It is usually one internode long
(iv) True leaves are commonly caducous. True leaves are either reduced to scales or modified to spines.
(v) Example: Rescus aculeatus, Asparagus etc. Example:Opuntia, Euphorbia royleana etc.

Pick up the wrong difference and select the correct option.

  1. (i) and (ii)

  2. (ii) and (v)

  3. (iii) and (v)

  4. (ii) and (iv)

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The table provided contains errors regarding the growth patterns and examples of phylloclades and cladodes. Specifically, point (ii) and (v) are incorrectly swapped or described.

Multiple choice botany stem - external morphology habit of plants plant classifications type of plants

Choose the correct answers from the alternatives given.
Annual rings are the number of

  1. Rings of vascular bundles in a monocot stem

  2. Layers of secondary xylem in a stem

  3. Internodes in a stem

  4. Both (b) and (c)

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Each year, the tree forms new cells, arranged in concentric circles called annual rings or annual growth rings. These annual rings show the amount of wood produced during one growing season. As the stem grows, complete ring called the cambial ring is formed. Cambial ring leads to the formation of secondary xylem and secondary phloem. 

Hence, the correct answer is 'Layers of secondary xylem in a stem'.

Multiple choice botany stem - external morphology habit of plants plant classifications type of plants

Choose the correct answers from the alternatives given.
During the secondary growth in the dicotyledonous stems the cork cambium gives rise to

  1. Secondary xylem and secondary phloem

  2. Secondary cortex and cork

  3. Pith and medullary rays

  4. Multicellular hairs

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cork cambium is a tissue found in many vascular plants as part of the epidermis. The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems. It gives rise to cork outside and secondary cortex inside. 

Hence, the correct answer is 'Secondary cortex and cork'.

Multiple choice morphology of angiosperms introduction to angiosperms morphology of flowering plants plant kingdom biology

Significance of vernlization is/are

  1. Early flowering

  2. Prevention of precocious reproductive development

  3. Shortening the life span of plants

  4. All of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vernalization is the induction of a plant's flowering process by exposure to the prolonged cold of winter. Its primary agricultural significance is to promote early flowering in plants that would otherwise remain in a vegetative state for longer periods.

Multiple choice morphology of angiosperms introduction to angiosperms morphology of flowering plants plant kingdom biology

A graminaceous spikelet is surrounded by

  1. Two scales called glumes

  2. Two scales called lemma and pale

  3. Two scales called lodicules

  4. None of the above

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In graminaceous spikelet or spikelet inflorescence of Poaceae, there is a pair of sterile glumes at the base of the spikelet. The lower, outer glume is called the first glume and the upper, inner glume is called the second glume. Just above the glumes, spikelets are present which are partly enclosed by glumes. Spikelets are characteristic of the grass family.

So, the correct answer is 'Two scales called glumes'.

Multiple choice morphology of angiosperms introduction to angiosperms morphology of flowering plants plant kingdom biology

Peculiarity of pistil of Poaceae is

  1. Two stigmas borne directly over ovary

  2. Three stigmas borne over ovary directly

  3. One stigma borne directly over ovary

  4. Three styles borne over ovary

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A pistil may consist of carpels, ovary, style, stigma, carpels may join together with a single ovary. Poaceae is a large family of monocotyledonous flowering plants which are collectively referred to as grasses. In Poaceae, the stigmas are 2 which are usually feathery and they are borne directly over an ovary. This is the peculiar feature of the pistil in Poaceae.

So, the correct answer is 'Two stigmas borne directly over ovary'.

Multiple choice morphology of angiosperms introduction to angiosperms morphology of flowering plants plant kingdom biology

Stem is culm in

  1. Bamboo

  2. Grass

  3. Both A and B

  4. Sunflower

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A culm is the areal jointed stem (above ground) of grass or bamboo. Typically, the culms are hollow but some species of bamboo have solid culms. In members of Poaceae family, the stem is underground rhizome in all perennial grasses, cylindrical, culm with conspicuous nodes and internodes, internodes hollow, herbaceous or woody, glabrous or glaucous, vegetative shoots are arising from the base of aerial stem or from underground stems.

So, the correct answer is 'Both A and B'.

Multiple choice morphology of angiosperms introduction to angiosperms morphology of flowering plants plant kingdom biology

Gynoecium of Poaceae is

  1. Bicarpellary syncarpous

  2. Tricarpallary syncarpous

  3. Monocarpellary

  4. Tricarpellary apocarpous

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Poaceae or Gramineae is a large family of monocotyledonous flowering plants which are collectively referred to as grasses. In Poaceae, the gynoecium is monocarpellary, ovary superior, unilocular with a single ovule, basal placentation, style short, stigma (usually 2 )feathery, papillate or branched.

So, the correct answer is 'Monocarpellary'.