A Typical Flower

Q.

What is a flower? Describe the parts of a typical angiosperm flower?

Q. Select the correct option.
i) A typical flower only consists of fertile parts.
ii) Differentiation and further development of the floral primordium happens before several hormonal and structural changes are initiated.
iii) Floral buds are borne on the inflorescence axis.
iv) The distal end of the filament in a stamen is attached to the thalamus or petal.

1. i, ii and iii are correct
2. All are correct
3. i, ii and iv are incorrect
4. All are incorrect

Q. Assertion (A): The decision that the plant is going to flower is taken much before the actual flowering takes place.
Reason (R): Various hormonal and structural changes take place only after initiation of flowering.
Select the appropriate option:

1. Only assertion is correct
2. Both assertion and reason are incorrect
3. Both assertion and reason are correct statements and reason is the correct explanation of the assertion
4. Both assertion and reason are correct statements and reason is an incorrect explanation of the assertion

Q. Hibiscus flower is

1. Bisexual
2. Unisexual
3. Neuter
4. None of these

Q. Which of the following parts of the flower are regarded as sterile and fertile?

1. $\begin{array}{ccc}\text{Label}& \text{Sterile}& \text{Fertile}\\ \text{A}& \text{Pedicel}& -\\ \text{B}& \text{Calyx}& -\\ \text{C}& -& \text{Carpel}\\ \text{E}& -& \text{Stamen}\end{array}$
2. $\begin{array}{ccc}\text{Label}& \text{Sterile}& \text{Fertile}\\ \text{A}& \text{Receptacle}& -\\ \text{B}& -& \text{Corolla}\\ \text{D}& \text{Calyx}& -\\ \text{E}& -& \text{Stamen}\end{array}$
3. $\begin{array}{ccc}\text{Label}& \text{Sterile}& \text{Fertile}\\ \text{A}& \text{Thalamus}& -\\ \text{B}& -& \text{Corolla}\\ \text{C}& -& \text{Carpel}\\ \text{D}& \text{Calyx}& -\end{array}$
4. $\begin{array}{ccc}\text{Label}& \text{Sterile}& \text{Fertile}\\ \text{A}& \text{Pedicel}& -\\ \text{C}& -& \text{Carpel}\\ \text{D}& \text{Calyx}& -\\ \text{E}& -& \text{Stamen}\end{array}$

Q. Identify the incorrect statement.

1. Corolla, calyx, androecium and gynoecium are all fertile parts of the flower
2. A lot of hormonal and structural transformations occur prior to initiation of flowering
3. Reproductive meristem develops into inflorescence over which floral primordia grows
4. Primordia develops first into floral buds and then flowers

Q. Which of the following plant has epipetalous flower?

1. Brinjal
2. Lily
3. China rose
4. Pea

Q. In papaya, the flowers are

1. unisexual
2. bisexual
3. hermaphrodite
4. not formed

Q. Didynamous condition is related to:

1. Androecium
2. Inflorescence
3. Gynoecium
4. All

Q. "X" is the outermost whorl of the flower and contains "Y". Y is green, leaf like and protect the other whorls of the flower. Identify X and Y.

1. X - Androecium; Y - Ovary
2. X - Calyx; Y - Sepals
3. X - Corolla; Y - Petals
4. X - Gynoecium; Y - Fruit

Q. A student collected 15 stamens from various flowers of different plant species. She arranged them on a slide to observe them. Select the most probable observations.
i) All flowers had stamens of the same length.
ii) Different flowers had stamens of different shapes and lengths.
iii) All flowers had stamens attached to them in a similar fashion.

1. Only i is incorrect
2. Only ii is correct
3. All but iii are correct
4. Both ii and iii are incorrect

Q. In the following plants sepals remain attached to fruit even after fertilization.
I. Brinjal II. Tomato III. Mango

1. I, III
2. II, III
3. I, II
4. I, II, III

Q.

The differentiation and development of floral primordium depends on -

1. Both A and B

2. Hormones

3. Environmental factors

4. Nutrients

Q. In ________ type of inflorescence, main axis terminates in a flower, hence is limited in growth and flowers are born in _________ succession.

1. racemose, acropetal
2. racemose, basipetal
3. cymose, acropetal
4. cymose, basipetal

Q. In racemose inflorescence

1. the peduncle terminates into a flower
2. the old, mature flower is at the top of the main axis
3. the flowers are arranged in a basipetal order
4. the growth of peduncle is indefinite

Q. Assertion: Photomodulation of flowering plant is a phytochrome regulated process.
Reason: Active form of phytochrome (Pfr) directly induces floral induction in shoot buds.

1. Assertion is true but reason is false.
2. Both Assertion and reason are true and reason is the correct explanation for assertion.
3. Both Assertion and reason are true but reason is not the correct explanation for assertion.
4. Both assertion and reason are false.

Q.

Flowers arise from a modified stem called the -

1. Receptacle

2. Corolla

3. Calyx

4. Androecium

Q.

Regarding assertion and reason, select the right option.

Assertion (A): Androecium and gynoecium are called essential whorls.
Reason (R): The two important units of sexual reproduction namely male and female gametes are produced by androecium and gynoecium respectively.

1. Both A and R are correct and R explains A

2. Both A and R are incorrect

3. A is correct and R is incorrect

4. Both A and R are correct and R does not explain A

Q.

Essential organs in a typical flower are always protected by non-reproductive parts.

1. True

2. False

Q.

Monoecious, female, pedicel, sepals and petals, thalamus, torus, receptacle, male, unisexual, bisexual, dioecious.

Use the above phrases to fill in the blanks.
Flower is a condensed shoot which is specialized to carry out sexual reproduction. It is borne over a stalk called ........ (1) .............
There is a broad base called .........(2) ............
Thalamus bears four types of floral organs-sepals, petals, stamens and carpels. ................(3) ........................ have no direct function in sexual reproduction.
They are called accessory or non-essential floral organs.
Stamens and carpels are essential floral organs as they take part in sexual reproduction.
Stamens are .........(4) ........... reproductive organs while carpels are ......... (5) .......... reproductive organs.
Flowers are called ..........(6) ............. if they have either stamens (male or staminate) or carpels (female or pistillate), e.g., papaya, watermelon.
They are known as ..........(7)..........if the flowers possess both stamens and carpels, e.g., Mustard, Hibiscus. Plants with unisexual flowers are called .......... (8) .......... if both male and female flowers occur on the same individual (e.g., Maize, Watermelon).
They are called ........... (9) ........ if male and female flowers are found on different individuals (e.g., Papaya).

1. (I) Pedicel, (2) thalamus, (3) Sepals and petals, (4) male, (5) female, (6) unisexual, (7) bisexual, (8) monoecious, (9) dioecious
2. (I) Dioecious, (2) thalamus, (3) sepals and petals, (4) male, (5) female, (6) unisexual, (7) bisexual, (8) monoecious, (9) pedicel
3. (I) Dioecious, (2) thalamus, (3) sepals and petals, (4) male, (5) female, (6) bisexual, (7) unisexual, (8) monoecious, (9) pedicel
4. (I) Dioecious, (2) sepals and petals, (3) thalamus, (4) male , (5) female, (6) bisexual, (7) unisexual, (8) monoecious, (9) pedicel

Q. When a certain character is inherited only through the female parent, it probably represents the case of

1. Incomplete dominance
2. Cytoplasmic inheritance
3. Mendelian inheritance
4. Qualitative inheritance

Q. Define aestivation.

Q. Which of the following parts of the flower are regarded as sterile and fertile?

1. $\begin{array}{ccc}\text{Label}& \text{Sterile}& \text{Fertile}\\ \text{A}& \text{Thalamus}& -\\ \text{B}& -& \text{Corolla}\\ \text{C}& -& \text{Carpel}\\ \text{D}& \text{Calyx}& -\end{array}$
2. $\begin{array}{ccc}\text{Label}& \text{Sterile}& \text{Fertile}\\ \text{A}& \text{Receptacle}& -\\ \text{B}& -& \text{Corolla}\\ \text{D}& \text{Calyx}& -\\ \text{E}& -& \text{Stamen}\end{array}$
3. $\begin{array}{ccc}\text{Label}& \text{Sterile}& \text{Fertile}\\ \text{A}& \text{Pedicel}& -\\ \text{C}& -& \text{Carpel}\\ \text{D}& \text{Calyx}& -\\ \text{E}& -& \text{Stamen}\end{array}$
4. $\begin{array}{ccc}\text{Label}& \text{Sterile}& \text{Fertile}\\ \text{A}& \text{Pedicel}& -\\ \text{B}& \text{Calyx}& -\\ \text{C}& -& \text{Carpel}\\ \text{E}& -& \text{Stamen}\end{array}$

Q.

Select the mismatch from the following options.

1. Perianth - Essential whorl

2. Androecium - Male reproductive part

3. Gynoecium - Female reproductive part

4. Sepals and Petals - Non-essential part

Q. Select the correct option.
$\begin{array}{cccc}& \text{Symbol}& & \text{Feature}\\ \text{A.}& \text{Br}& \text{i.}& \text{Corolla}\\ \text{B.}& \text{K}& \text{ii.}& \text{Perianth}\\ \text{C.}& \text{C}& \text{iii.}& \text{Calyx}\\ \text{D.}& \text{P}& \text{iv.}& \text{Bracteate}\end{array}$

1. A (iv), B (ii), B (iii), D (i)
2. A (iv), B (i), B (iii), D (ii)
3. A (i), B (ii), B (iii), D (iv)
4. A (iv), B (iii), B (i), D (ii)

Q.

Match the following.
$\begin{array}{cc}Column-I& Column-II\\ \left(i\right).Calyx& 1.Whorlofcarpels\\ \left(ii\right).Corolla& 2.Whorlofstamens\\ \left(iii\right).Androecium& 3.Whorlofsepals\\ \left(iv\right).Gynoecium& 4.Whorlofpetals\end{array}$

1. (i) - 3, (ii) - 4, (iii) - 1, (iv) - 2

2. (i) - 3, (ii) - 4, (iii) - 2, (iv) - 1

3. (i) - 4, (ii) - 3, (iii) - 2, (iv) - 1

4. (i) - 1, (ii) - 2, (iii) - 3, (iv) - 4

Q. Select the correct option.
i) A typical flower only consists of fertile parts.
ii) Differentiation and further development of the floral primordium happens before several hormonal and structural changes are initiated.
iii) Floral buds are borne on the inflorescence axis.
iv) The distal end of the filament in a stamen is attached to the thalamus or petal.

1. All are incorrect
2. i, ii and iii are correct
3. All are correct
4. i, ii and iv are incorrect

Q. Flower is modified

1. Leaf
2. Root
3. Shoot
4. Leaf base

Q. Distinguish between structural gene, regulatory gene and operator gene.

Q. Assertion :Lac operon is a repressible operon. Reason: The product of gene activity stops the activity of the said gene.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect