Herbicide that blocks electrons transport from PS-II to PS-I by inhibiting electron flow between plastoquinone → Cytochrome is

• DCMU

• Paraquat

• DCPIP

• None of these

A plant is provided with the ideal conditions for photosynthesis and supplied with isotope 14 CO₂. When the products of the process are analysed carefully, what would be the nature of products?

• Glucose and oxygen are labelled

• Oxygen is labelled, but glucose is normal

• Glucose and oxygen are normal 

• Glucose is labelled, but oxygen is normal

Cotyledons and testa are edible parts of

• groundnut and pomegranate

• walnut and tamarind

• french bean and coconut

• cashew nut and litchi

144.

Given below is a schematic break-up of the phases/stages of cell cycle. Which one of the following is the correct indication of the stage/ phase in the cell cycle?

• C-karyokinesis

• S-synthetic phase

• A-cytokinesis

• B-metaphase

In photosynthesis carbon dioxide is converted to carbohydrates. It is a process.

• Reductive

• Oxidative

• Catabolic and exergonic

• None of the above

Which of the following characteristics is are exhibited by C₄ -plants?

I. Kranz anatomy.
II. The first product of photosynthesis is oxaloacetic acid.
III. Both PEP carboxylates and ribulose biphosphate carboxylate act as carboxylating enzymes.

The correct option is

• I and III, but not ll

• I and II, but not III

• II and III, but not I

• ll and III

Which of the following plant keeps its stomata open during night and closed during the day?

• Orchid

• Cactus

• Tea

• Wheat

In which one of the following, the male and female gametophytes don’t have free-living independent existence?

• Pteris

• Funaria

• Polytrichum

• Cedrus

Quantasome are present in

• Chloroplast

• Mitochondria

• Golgi body

• Lysosome

Which of the following cell organelles is associated with photorespiration?

• Mitochondria

• Peroxysome

• Chloroplast

• All of these