One hormone stimulates the closure of stomata and another one influences the swelling of the axis in dicot plants. They are
Gibberellins and ethylene
Abscisic acid and cytokinins
Gibberellins and cytokinins
Auxin and cytokinins
Auxin and cytokinins
Which of the following statements regarding photoperiodism is false?
The response of plants to periods of light/day is termed photoperiodism
The shoot apices cannot perceive photoperiods
In day neutral plants there is no correlation between exposure to light duration and induction of flowering response.
Shoot apices modify themselves into flowering apices prior to flowering
Shoot apices modify themselves into flowering apices prior to flowering
Which of the following is false in angiosperms?
Egg cell – Haploid
Megaspore – Diploid
Pollen grain – Haploid
Synergid – Haploid
Synergid – Haploid
Flame cells of flatworms help in
(i) osmoregulation
(ii) digestion
(iii) reproduction
(iv) excretion
(v) bioluminescence
(ii) only is correct
(i) and (iv) are correct
(iii) only is correct
(i) and (v) are correct
(i) and (v) are correct
Read the statements regarding echinoderms and choose the correct option
(1) All are marine with organ system level of organisation.
(2) Adults are bilaterally symmetrical.
(3) They are dioecious.
(4) Fertilisation is internal and indirect development is observed.
(5) Triploblastic and acoelomate animals.
(1) and (3) are correct
(5) alone is correct
(1), (3) and (5) are correct
(1) and (5) are correct
(1) and (5) are correct
A.
(1) and (3) are correct
The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical. They are triploblastic and coelomate animals. Fertilization is usually external and indirect development is observed.
This class of animals are all ectoparasites on some fishes
Amphibia
Osteichthyes
Reptilia
Cyclostomata
Cyclostomata
Organ | Phylum | Function |
Parapodia | Annelida | ? A |
? B | Ctenophora | Locomotion |
? C | Mollusca | Rasping organ |
Malpighian tubules | Arthropoda | ? B |
Cnidoblasts | Coelenterata | ? E |
A - swimming; B - comb plates; C - radula; D - excretion; E - defense
A - defense; B - radula; C - comb plates; D - excretion; E - swimming
A - defense; B - radula; C - comb plates; D - swimming; E - excretion
A - protection; B - parapodia; C - visceral mass; D - locomotion; E - excretion
A - protection; B - parapodia; C - visceral mass; D - locomotion; E - excretion
In the circulatory system of Pheretima, A, B, C and D represents
A - Lateral hearts; B - Sub neural vessel; C - Commissural vessel; D - Lateral oesophageal vessel
A - Lateral hearts; B - Lateral oesophageal vessel; C - Sub- neural vessel; D - Commissural vessel
A - Lateral hearts; B - Commissural vessel; C - Sub- neural vessel; D - Lateral oesophageal vessel
A - Commissural vessels; B - Lateral hearts; C - Lateral oesophageal vessel; D - Sub- neural vessel
A - Commissural vessels; B - Lateral hearts; C - Lateral oesophageal vessel; D - Sub- neural vessel
The structure in earthworm which serves as a wedge to force open cracks in the soil is
Peristomium
Setae
Clitellum
Typhlosole
Typhlosole
Which among these is not involved in excretion in cockroaches?
Malphigian tubules
Nephrocytes
Urecose glands
Maxillary palps
Maxillary palps