Reproduction in Gymnosperms

Q. Which of the following gymnosperm has unbranched stem?

1. Cycas
2. Pinus
3. Gingko
4. Cedrus

Q. Endosperm is of what ploidy in gymnosperms and why??

Q. Pollen grain of gymnosperms has 16 chromosomes. How many chromosomes will the endosperm of the gymnosperms have?

1. 32
2. 16
3. 64
4. 8

Q. Select the correct pattern of arrangement of reproductive structures for gymnosperms.

1. Spores → Sporophylls → Sporangia → Strobili
2. Spores → Sporangia → Sporophylls → Strobili
3. Sporangia → Sporophylls → Spores → Strobili
4. Spores → Sporangia → Strobili → Sporophylls

Q.

Difference between homosporous and heterosporous.

Q. _____________ is formed before fertilization in gymnosperms.

1. Seed
2. Embryo
3. Cotyledon
4. Endosperm

Q.

The outermost layer of maize endosperm is known as

1. Endothecium

2. Tapetum

3. Aleurone

4. Perisperm

Q.

What is required for transport of male gametes in bryophyte and pteridophyte?

1. Wind

2. Insects

3. Bird

4. Water

Q.

What is meant by heterosporous?

Q. The heart shaped form of prothallus in homosporous species of pteridophytes represents

1. dioecious gametophyte stage
2. monoecious sporophyte stage
3. monoecious gametophyte stage
4. dioecious sporophyte stage

Q. The neck canal cells are absent in the archegonia of:

1. Cycas
2. Bryophytes
3. Funaria
4. Pteridophytes

Q. In gymnosperms, the female gametophyte bears how many archegonium / archegonia ?

1. One
2. 1 or 2
3. Two or more
4. None of the above

Q. Diploid egg can directly develop into embryo without fertilisation commonly in all the following plants except

1. Rubus
2. Poa
3. Citrus
4. Apple

Q. Which among the following is the correct statement?

1. All gymnosperms are homosporous
2. Mostly all gymnosperms are heterosporous and only few are homosporous
3. All gymnosperms and all pteridophytes are heterosporous
4. All gymnosperms are heterosporous

Q.

What is the ploidy of gametophyte in gymnosperms ?

Q. Which of the following is haploid in gymnosperms?

1. Microspore mother cell
2. Endosperm
3. Megaspore mother cell
4. Nucellus

Q. How many chromosomes are present in gymnospermic endosperm if a leaf has 12 chromosomes ?

1. 24
2. 6
3. 12
4. 18

Q. Which is the dominant phase of pteridophytes?

1. Capsule
2. Gametophyte
3. Sporophyte
4. Embryo

Q. The megaspore of gymnosperm divides by mitosis to produce a

1. multicellular embryo
2. needle-like leaf
3. female gametophyte
4. pollen grain

Q. The female gametophyte is multicellular in gymnosperms.

1. True
2. False

Q. Caruncle is found in

1. calotropis
2. castor
3. litchi
4. black pepper

Q. What is a sporophyte and gametophyte

Q. Why is Euglena called a plant-animal?

Q. Chooose the correct statements.

1. Gymnosperms are heterosporous
2. Cones with megasporophylls are called female strobili
3. Megasporangium develops into a unicellular female gametophyte
4. Archegonia are male sex organs

Q.

why are tapetal cells bi-nucleate?

Q. Pollen grain of gymnosperms has 16 chromosomes. How many chromosomes will the endosperm of the gymnosperms have?

1. 32
2. 16
3. 8
4. 64

Q. Which one of the following pair of plant structures have haploid number of chromosomes?

1. Megaspore mother cell and antipodal cells
2. Egg cell and antipodal cell
3. Nucellus and antipodal cells
4. Egg nucleus and secondary nucleus

Q.

What are the functions of the outer layers of microsporangium?

Q. The number of free nuclear mitotic divisions that occur during the formation of $7-celled,8-nucleated$$ embryosac from a single functional megaspore __________________.

1. $3$
2. $8$
3. $7$
4. $4$

Q. Select the correct pattern of arrangement of reproductive structures for gymnosperms.

1. Spores $\to$ Sporophylls $\to$ Sporangia$\to$ Strobili
2. Spores $\to$ Sporangia $\to$ Sporophylls $\to$ Strobili
3. Sporangia $\to$ Sporophylls $\to$ Spores $\to$ Strobili
4. Spores $\to$ Sporangia $\to$ Strobili $\to$ Sporophylls