Question
Large, empty colourless cells of the adaxial epidermis along the veins of grass leaves are [NEET (Oct.) 2020]
(a) lenticels
(b) guard cells
(c) bundle sheath cells
(d) bulliform cells
Answer/Explanation
Ans. (d)
Grass leaves are isobilateral or typical monocot leaves. In such leaves, at places, the upper or adaxial epidermis contain groups of larger, thin-walled, colourless cells called bulliform cells. These cells are highly vacuolated and can store water, if available. However, these cells lose water and become flaccid in case of water deficiency.
Question
Which of the following shows whorled phyllotaxy? [NEET (Odisha) 2019]
(a) Mustard
(b) China rose
(c) Alstonia
(d) Calotropis
Answer/Explanation
Ans. (c)
Alstonia shows whorled phyllotaxy. In whorled phyllotaxy, more than two leaves arise at a node and form a whorl. Mustard and China rose show alternate phyllotaxy. Colotropis shows opposite phyllotaxy.
Question
Phyllode is present in [CBSE AIPMT 2012]
(a) Asparagus
(b) Euphorbia
(c) Australian Acacia
(d) Opuntia
Answer/Explanation
Ans. (c)
Modified petiole is called phyllode present in Australion Acacia. Phyllodes develop usually vertically and possess fewer stomata hence, reduce transpiration.
Question
Choose the correct match. Bladderwort, Sundew, Venus fly trap [CBSE AIPMT 2002]
(a) Nepenthes, Dionea, Drosera
(b) Nepenthes, Utricularia, Vanda
(c) Utricularia, Drosera, Dionea
(d) Dionea, Trapa, Vanda
Answer/Explanation
Ans. (c)
Utricularia, Drosera and Dionaea are also known as bladderwort, sundew and venus fly trap, respectively.