From the statements given below choose the option that is true for a typical female gametophyte.
i. | It is eight-nucleate and seven-celled at maturity. |
ii. | It is free-nuclear during the development. |
iii. | It is situated inside the integument, but outside the nucellus. |
iv. | It has an egg apparatus situated at the chalazal end. |
1. (i) and (iv)
2. (ii) and (iii)
3. (i) and (ii)
4. (ii) and (iv)
Match Column I with Column II and select the correct option using the codes given below:
Column I |
|
Column II |
|
A. |
Pistils fused together |
1. |
Gametogenesis |
B. |
Formation of gametes |
2. |
Pistillate |
C. |
Hyphae of higher ascomycetes |
3. |
Syncarpous |
D. |
Unisexual female flower |
4. |
Dikaryotic |
Codes:
A |
B |
C |
D |
|
1. |
4 |
3 |
2 |
1 |
2. |
2 |
1 |
4 |
3 |
3. |
1 |
2 |
4 |
3 |
4. |
3 |
1 |
4 |
2 |
स्तंभ II के साथ स्तंभ I का मिलान करें और नीचे दिए गए संकेतों का उपयोग करके सही विकल्प चुनें:
स्तंभ I |
|
स्तंभ II |
|
A. |
स्त्रीकेसर एक साथ संगलित |
1. |
युग्मकजनन |
B. |
युग्मकों का गठन |
2. |
स्त्रीकेसरी |
C. |
उच्च एस्कोमाइसिटीज के कवक तंतु |
3. |
युक्तांडपी |
D. |
उभयलिंगी मादा पुष्प |
4. |
द्विकेंद्रकी |
Codes:
A |
B |
C |
D |
|
(1) |
4 |
3 |
2 |
1 |
(2) |
2 |
1 |
4 |
3 |
(3) |
1 |
2 |
4 |
3 |
(4) |
3 |
1 |
4 |
2 |
Match the two columns that represent plant organs (I) and parts within these organs (II).
Column I | Column II |
A. Carpel | (i) calyx, corolla |
B. Perianth | (ii) Vegetative cell, generative cell |
C. Microsporocyte | (iii) Stigma, style, ovary |
D. Megasporocyte | (iv) Antipodal cells, polar nuclei, synergid cell |
1. A-(i); B-(iii); C-(ii); D-(iv)
2. A-(iii); B-(iv); C-(i); D-(ii)
3. A-(i); B-(iii); C-(iv); D-(ii)
4. A-(iii); B-(i); C-(ii); D-(iv)
Identify two correct characteristic features of (P) Autogamy and (Q) Allogamy from the following statements
1. Plant species usually does not depend on external agents
2. Plant species usually depends on external agents
3. Plant species normally produces progeny that are healthier and better adapted in nature
4. Plant species normally produces weaker progeny in several generations
1. P-1,3; Q-2,4
2. P-2,4; Q-1,3
3. P-1,4; Q-2,3
4. P-2,3; Q-1,4
Match the following :
Column I | Column I | ||
(I) | External fertilization | (i) | pollen grain |
(II) | Androecium | (ii) | anther wall |
(III) | Male gametophyte | (iii) | algae |
(IV) | Primary parietal layer | (iv) | stamens |
1. I-iv; II-i; III-ii; IV-iii
2. I-iii; II-iv; III-i; IV-ii
3. I-iii; II-iv; III-ii; IV-i
4. I-iii; II-i; III-iv; IV-ii
Which process is matched with a valid example?
Process | Example |
1. seed dispersal | a stamen explodes in the wind |
2. fertilization | a nucleus from the pollen grain fuses with a nucleus in the ovule |
3. fertilization | a bee carries pollen from flower to flower |
4. pollination | seeds are blown from a flower onto another one by the wind |
Assertion : Cleistogamy is advantageous to the plants.
Reason : It results in the assured seed formation even in the absence of pollinators.
1. If both Assertion & Reason are true and the Reason is the correct explanation of the Assertion.
2. If both Assertion & Reason are true but the Reason is not the correct explanation of the Assertion
3. If Assertion is a true statement but Reason is false.
4. If both Assertion and Reason are false.
A typical anther shows
a. Two lobes with two theca each
b. Each lode as dithecous
c. All cells in a given microsporangium as potential PMC
d. Thousands of micropores per microsporangium
Out of these statements
1. b is incorrect
2. a and b are correct
3. c and d are incorrect
4. a, b, c and d are correct
Choose the correct match with respect to ploidy level in angiosperms :
1. Synergids - Triploid (3n)
2. Antipodal cells - Triploid (3n
3. Secondary nucleus- Diploid (2n)
4. Egg cell - Diploid (2n)
Read the two statements A & B given below and select the correct option :
A- Embryo sac of angiosperms is a 7 celled structure.
B – Embryo sac has three synergid cells.
1. Both A and B are correct
2. Both A and B are incorrect
3. Only A is correct
4. Only B is correct