Passage cells are thin-walled cells found in

• endodermis of roots facilitating rapid transport of water from cortex to pericycle

• phloem elements that serve as entry points for substance for transport to other plant parts

• testa of seeds to enable emergence of growing embryonic axis during seed germination

• testa of seeds to enable emergence of growing embryonic axis during seed germination

Opening of floral buds into flowers, is a type of

• autonomic movement of locomotion

• autonomic movement of variation

• paratonic movement of growth

• paratonic movement of growth

In the leaves of C₄ plants, malic acid formation during CO2 fixation occurs in the cells of

• mesophyll

• bundle sheath

• phloem

• phloem

In human body, which one of the following is anatomically correct?

• Floating ribs - 2 pairs

• Collar bones - 3 pairs

• Salivary glands - 1 pair

• Salivary glands - 1 pair

Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing micro-organism

• casuarina equisetifolia

• crotalaria juncea

• cycas revoluta

• cycas revoluta

6.

In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are

• n = 7  and x = 21

• n = 21 and x = 21

• n = 21  and x = 14

• n = 21  and x = 14

Flagellated male gametes are present in all the three of which one of the following sets?

• Anthoceros, Funaria and Spirogyra

• Zygnema, Saprolegnia and Hydrilla

• Fucus, Marsilea and Calotropis

• Fucus, Marsilea and Calotropis

Increased asthmatics attacks in certain seasons are related to

• hot and humid environment

• eating fruits preserved in tin containers

• inhalation of seasonal pollen

• inhalation of seasonal pollen

Which of the following is a slime mould?

• Rhizopus

• Physarum

• Thiobacillus

• Thiobacillus

Which of the following is an example of negative feedback loop in humans?

• constriction of skin blood vessels and contraction of skeletal muscles when it is too cold

• secretion of tears after falling of sand particles into the eye

• salivation of mouth at the sight of delicious food

• salivation of mouth at the sight of delicious food