Dorsiventral Leaf

Q.

Describe the internal structure of a dorsiventral leaf with the help of labelled diagrams.

Q. Study vertical sections of leaves, one of a C3 plant and the other of a C4 plant. Do you notice the difference? Do both have the same type of mesophylls?

Q. Why do cacti have so many thorns?

Q. Mesophyll tissue is not differentiated into palisade tissue and spongy tissue in:

1. Leaf of Eucalyptus
2. Leaf of Nerium
3. Leaf of maize
4. All of the above

Q.

Point out the differences in the anatomy of leaf of peepal (Ficus religiosa) and maize (Zea mays). Draw the diagrams and label the differences.

Q.

Describe the internal structure of a dorsiventral leaf with the help of labelled diagrams.

Q.

The leaves in dicot plants show ______.

Q. Read the assertion and reason carefully to mark the correct option in question.

Assertion: When the veins run parallel to each other within a lamina, the venation is termed as parallel which is the characteristic of most monocotyledons.

Reason: When the veinlet form a network, the venation is termed as reticulate which is generally found in dicotyledons.

1. If both assertion and reason are false.
   
2. If both assertion and reason are true and the reason is the correct explanation of the assertion.
3. If assertion is true but reason is false.
4. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Q. Kranz anatomy can be observed in leaves of

1. Spinach
2. Sorghum
3. Mustard
4. Tulip

Q. Swollen spongy petiole is present in

1. Hydrilla
2. Eichhornia
3. Ruppia
4. Pistia

Q. Adaxial epidermal cells along the veins of grasses gets modified into

1. bundle sheath cells
2. stele
3. sclereids
4. bulliform cells

Q. Kranz anatomy can be observed in leaves of ______________.

1. Sorghum
2. Spinach
3. Mustard
4. Tulip

Q. Coleorhiza and coleoptile are the protective sheaths covering _______ and ______ respectively.

1. Plumule, Hypocotyl
2. Radicle, Plumule
3. Plumule, Radicle
4. Epicotyle, Radicle

Q. The features of monocot leaves are
(a) Mesophyll is not differentiated
(b) Vascular bundles are conjoint and closed
(c) Stomach are present on both surfaces

1. only a and b
2. Only b and c
3. Only a and c
4. All a, b, and c

Q. Match the tissue or cell with its characteristic feature in a dorsiventral dicot leaf.

1. Arranged compactly
2. Abaxial location
3. Loosely arranged
4. Adaxial location

Q. Which of the following is capable of performing photosynthesis at high temperature i.e. at ${50}^{o}C$

1. Opuntia
2. Mango
3. Potato
4. None of the above

Q.

There is usually a large vascular bundle seen in dicot leaf and the other vascular bundles are smaller in size compared to it.

1. True

2. False

Q. Parenchyma with large air spaces are called as

1. Stellate parenchyma
2. Aerenchyma
3. Prosenchyma
   
4. None of the above

Q. How is monocot leaf similar to dicot leaf?

1. Absence of mesophyll
2. Arrangement of stomata
3. Presence of vascular bundles
4. Presence of stomata

Q. The given figure shows T.S. of Helianthus leaf with various parts labelled as A, B, C, D, E and F. Identify the parts and select the correct option.

1. A - Epidermis, B - Spongy parenchyma, C - Palisade parenchyma, D- Stomata, E - Phloem, F - Xylem
2. A - Epidermis, B - Palisade parenchyma, C - Spongy parenchyma, D- Stomata, E - Xylem, E - Phloem
3. A - Epidermis, B - Palisade parenchyma, C - Spongy parenchyma, D- Stomata, E - Endodermis, F - Xylem
4. A - Epidermis, B - Palisade parenchyma, C - Spongy parenchyma, D- Stomata, E - Phloem, F - Xylem

Q. Photorespiration is a characteristic feature of :

1. CAM plants
2. $C_3$ plants
3. $C_4$ plants
4. None of the above

Q.

How does the morphology of the leaf relate to its anatomy in dicots and monocots?

1. All the above

2. The venation of the leaf defines the arrangement of vascular tissue

3. The monocots leaves have similar type of epidermis on both sides due to their vertical structure

4. The horizontal leaf of dicots produce more energy by photosynthesis as compared to the vertical leaf of monocots.

Q. Unsunken stomata found in crypts belong to

1. Banyan
2. Mango
3. Nerium
4. Sunflower

Q. Differentiate between the anatomy of a dorsiventral leaf and that of an isobilateral leaf.

Q. Name the kind of tissue found:
In the walls of the veins of leaves

Q. Aerenchyma is found in

1. Hydrophytes
2. Lithophytes
3. Sciophytes
4. Xerophytes

Q. How is monocot leaf similar to dicot leaf?

1. Absence of mesophyll
2. Presence of vascular bundles
3. Arrangement of stomata
4. Presence of stomata

Q.

There is usually a large vascular bundle seen in dicot leaf and the other vascular bundles are smaller in size compared to it.

1. False

2. True

Q. Stomata remain open when relative humidity is :

1. Above 70%
2. 50-70%
3. 30-50%
4. Below 30%

Q. Stomata close at relative humidity of :

1. 60-70%
2. 50-60%
3. 50-70%
4. Less than 50%