CBSE Class 11 Biology Plant Growth And Development Worksheet Set 02

Plant Growth And Development MCQ Questions with Answers Class 11 Biology

Question. Examples of lateral meristems are

(1) Phellogen and collenchyma

(2) Vascular cambium and phellem

(3) Vascular cambium and cork cambium

(4) Xylem and cork cambium

Answer (3)

These are structures which appear later in the life of a plant.

Question. Which parameter is used to measure the growth in flat organs like leaves?

(1) Increase in dry weight

(2) Increase in cell size

(3) Increase in surface area

(4) Increase in length

Answer (3)

The parameter is used for measuring growth in flat organs like leaves are surface area.

Question. Which phase of a sigmoid curve explains the initial phase of growth when growth rate is very slow?

(1) Log phase

(2) Lag phase

(3) Stationary phase

(4) Maturation phase

Answer (2)

Starting or initial phase.

Question. ______ curve is obtained for cells in culture.

(1) J-shaped

(2) Linear

(3) V-shaped

(4) S-shaped

Answer (4)

Question. Which of the following is difficult to measure directly?

(1) Increase in protoplasm content

(2) Increase in surface area

(3) Increase in dry weight

(4) Increase in volume

Answer (1)

Increase in protoplasm content is difficult to measure, while surface area, volume and dry weight measurement are easy.

Question. Deposition of new materials inside the cell wall of cells starts in

(1) Meristematic phase

(2) Reproductive phase

(3) Maturation phase

(4) Elongation phase

Answer (4)

During this phase cell elongates due to deposition of new materials inside cell wall of cell.

Question. Plant growth is unique in being

(1) Closed

(2) Unlimited

(3) Diffuse

(4) Limited

Answer (2)

Plants show indeterminate or unlimited growth, throughout their, life. Hence, we say that plant growth is unique in being unlimited.

Question. Increase in the girth of plant is known as/done by

(1) Primary growth

(2) Apical meristem

(3) Intercalary meristem

(4) Secondary growth

Answer (4)

Increase in girth is secondary growth.
Increase in height is primary growth.

Question. Which of the following structures show unlimited growth in plants?

(1) Leaves

(2) Flowers

(3) Fruits

(4) Roots

Answer (4)

Roots, stems show continuous, indeterminate growth due to presence of apical meristem.Leaves, fruits, flowers show closed, determinate growth due to intercalary meristem.

Question. Growth of an organ is defined as

(1) Infinite increase in size

(2) Irreversible increase in size

(3) Reversible increase in size

(4) Infinite and reversible increase in size

Answer (2)

Organs show limited growth and growth is irreversible.

Question. Which type of cells have the capacity of self perpetuation?

(1) Meristematic cells

(2) Companion cells

(3) Sieve cells

(4) Parenchyma cells

Answer (1)

These cells are in state of continuous division i.e, they are capable of self perpetuation, have power to continue indefinitely through division.

Question. Tracheids do not collapse under extreme tension due to the presence of

(1) Strong, elastic lignocellulosic secondary cell wall

(2) Thick, cellulosic primary cell wall

(3) Thin, elastic, cellulosic primary cell wall

(4) Thick, hard suberised secondary cell wall

Answer (1)

Because tracheids have made themselves strong, elastic etc by process of differentiation i.e., specialised for particular function.

Question.  Which factor determines the direction of movement of main root and stem?

(1) Oxygen

(2) Gravity

(3) Temperature

(4) Nutrients

Answer (2)

Root is positive geotropic while stem is negative geotropic.

Question. A Leaf of 20 cm² grows 5 cm² per hour and B Leaf of 25 cm² grows 5 cm² per hour The relative growth rate of leaf A and B respectively is

(1) 25% and 20%

(2) 20% and 25%

(3) 50% and 100%

(4) 25% and 50%

Answer (1)

Question. What happens to the growth of roots during water logging conditions?

(1) Growth is accelerated

(2) Growth is inhibited

(3) Growth remains constant

(4) First growth is accelerated and then stops

Answer (2)

Oxygen deficiency occurs due to water logging, thus growth is inhibited.

Question.  Which of the following is not a function of water in plants?

(1) It is responsible for cell elongation

(2) It maintains the turgidity of cells

(3) It acts as a source of energy

(4) It provides medium for enzymatic activities

Answer (3)

It is not producing energy. It helps in maintaining turgidity, cell elongation and in enzymatic activities.

Question. Which abiotic factor is not essential for early growth of the plant but growth is sustained only in its presence?

(1) Water

(2) Oxygen

(3) Nutrients

(4) Light

Answer (4)

Abiotic means non-living. Light is not required for early growth but growth will continue only in its presence. Water, nutrients, oxygen are required for early growth.

Question. Cork, secondary cortex and secondary xylem are formed through

(1) Dedifferentiation

(2) Redifferentiation

(3) Differentiation

(4) Obliteration

Answer (2)

Cork, secondary cortex and secondary xylem all are secondary structure formed from dedifferentiated cell by redifferentiation and are responsible for secondary growth.

Question. Which of the following is formed after dedifferentiation?

(1) Secondary phloem

(2) Secondary cortex

(3) Parenchyma

(4) Interfascicular vascular cambium

Answer (4)

Question. Which type of phytohormone is made up of indole compounds?

(1) Zeatin

(2) ABA

(3) Auxin

(4) Gibberellins

Answer (3)

Indole 3-acetic acid - IAA
Indole butyric acid - IBA

Question. Two synthetic auxins are

(1) IAA and IBA

(2) 2, 4-D and NAA

(3) IAA and NAA

(4) 2, 4-D and IBA

 Answer (2)

2, 4-D i.e., 2, 4-Dichlorophenoxyacetic acid NAA i.e., Napthalene acetic acid are produced artificially.

Question. Plant growth regulators (PGRs) are

(1) Simple organic substances of different chemical composition

(2) Complex organic substances of different chemical composition

(3) Simple and complex organic substances of same chemical composition

(4) Small organic substances of same chemical composition

Answer (1)

PGRs are simple organic substances of different chemical composition.

Question. The ability of a plant to follow different pathways and produce different structures in response to environment is known as

(1) Heterophylly

(2) Plasticity

(3) Efficiency index

(4) Vernalisation

 Answer (2)

Question.  Heterophylly means

(1) The appearance of different forms of leaves on the same plant species

(2) The appearance of same form of leaves on different plants

(3) The appearance of same form of flowers on different plants

(4) The appearance of different forms of fruits on the same plant

Answer (1)

More Question

SECTION -A

Q1. Why is plant growth generally indeterminate?

Q2. Define growth rate.

Q3. A farmer grows cucumber plants in his field. He wants to increase the number of female flowers in them which plant growth regulator can be applied to achieve this?

Q4. What does an overripe apple release which affects all other apples in the basket?

Q5. What part of plant perceives low temperature for vernalisation?

SECTION-B

Q1. Explain different phases of growth with the help of a diagram.

Q2. What is meant by the term development? Give sequence of the development process in a plant cell.

Q3. What is plasticity? Explain with an example.

Q4. What are auxins? Give important applications of auxins.

Q5. What is bolting?

SECTION-C

Q1. Describe briefly:

   (i) Arithmetic growth

   (ii) Geometric growth

   (iii) Sigmoid growth

   (iv) Absolute and relative growth rates. 

Q2. What are gibberellins? Give their functions.

Q3. Explain what is meant by the terms differentiation, dedifferentiation and redifferentitation.

Q4. A Chrysanthemum plant with floral buds requires more than 12 hours of dark night-time to flower. If the night is interrupted by white light for duration of an hour, will the flowers bloom the following morning? Name the pigment that perceives the light stimulus for flowering. Where is the pigment present in that plant, and what are its two forms?

Q5. Why is the term ‘long day plants’ a misnomer? Explain briefly.

Q6. What do you understand by Vernalisation? Describe its significance.

Q7. Which one of the plant growth regulators would you use if you were asked to:

(a) Induce rooting in a twig.

(b) Quickly ripen a fruit.

(c) Delay leaf senescence.

(d) Induce growth in axillary buds.

(e) ‘bolt’ a rosette plant.

(f) Induce immediate stomatal closure in leaves.

SECTION-D

Q1. What is photoperiodism? How do you categorize the angiosperms on the basis of their flowering response to photoperiod?